PHP GET Variable [duplicate]

Everyone runs into syntax errors. Even experienced programmers make typos. For newcomers it's just part of the learning process. However, it's often easy to interpret error messages such as:
PHP Parse error: syntax error, unexpected '{' in index.php on line 20
The unexpected symbol isn't always the real culprit. But the line number gives a rough idea where to start looking.
Always look at the code context. The syntax mistake often hides in the mentioned or in previous code lines. Compare your code against syntax examples from the manual.
While not every case matches the other. Yet there are some general steps to solve syntax mistakes.
This references summarized the common pitfalls:
Unexpected T_STRING
Unexpected T_VARIABLE Unexpected '$varname' (T_VARIABLE)
Unexpected $end
Unexpected T_FUNCTION…
Unexpected {
Unexpected }
Unexpected (
Unexpected )
Unexpected [
Unexpected ]
Unexpected T_IF Unexpected T_FOREACH Unexpected T_FOR Unexpected T_WHILE Unexpected T_DO Unexpected T_PRINT Unexpected T_ECHO
Unexpected T_INLINE_HTML…
Unexpected T_DOUBLE_ARROW…
Unexpected T_SL…
Unexpected T_BOOLEAN_OR…
Unexpected T_BOOLEAN_AND…
Unexpected T_IS_EQUAL
Unexpected T_IS_NOT_EQUAL
Unexpected <
Unexpected >
Unexpected T_NS_SEPARATOR…
Unexpected character in input: '\' (ASCII=92) state=1
Unexpected 'public' (T_PUBLIC) Unexpected 'private' (T_PRIVATE) Unexpected 'protected' (T_PROTECTED) Unexpected 'final' (T_FINAL)…
Unexpected T_STATIC…
Unexpected T_CLASS…
Unexpected T_DNUMBER
Unexpected , (comma)
Unpexected . (period)
Unexpected ; (semicolon)
Unexpected * (asterisk)
Unexpected : (colon)
Closely related references:
What does this error mean in PHP? (runtime errors)
Parse error: syntax error, unexpected T_XXX
Parse error: syntax error, unexpected T_ENCAPSED_AND_WHITESPACE
Parse error: syntax error, unexpected T_VARIABLE
What does this symbol mean in PHP? (language tokens)
Those “” smart ‘’ quotes mean nothing to PHP
The PHP manual on and its various language tokens
Or Wikipedias syntax introduction on PHP.
And lastly our php tag-wiki of course.
While Stackoverflow is also welcoming rookie coders, it's mostly targetted at professional programming questions.
Answering everyones coding mistakes and narrow typos is considered mostly off-topic.
So please take the time to follow the basic steps, before posting syntax fixing requests.
If you still have to, please show your own solving initiative, attempted fixes, and your thought process on what looks or might be wrong.
If your browser displays error messages such as "SyntaxError: illegal character", then it's not actually php-related, but a javascript-syntax error.
What are syntax errors?
PHP belongs to the C-style and imperative programming languages. It has rigid grammar rules, which it cannot recover from when encountering misplaced symbols or identifiers. It can't guess your coding intentions.
Most important tips
There are a few basic precautions you can always take:
Use proper code indentation, or adopt any lofty coding style.
Readability prevents irregularities.
Use an IDE or editor for PHP with syntax highlighting.
Which also help with parens/bracket balancing.
Read the language reference and examples in the manual.
Twice, to become somewhat proficient.
How to interpret parser errors?
A typical syntax error message reads:
Parse error: syntax error, unexpected T_STRING, expecting ';' in file.php on line 217
Which lists the possible location of a syntax mistake. See the mentioned file name and line number.
A moniker such as T_STRING explains which symbol the parser/tokenizer couldn't process finally. This isn't necessarily the cause of the syntax mistake however.
It's important to look into previous code lines as well. Often syntax errors are just mishaps that happened earlier. The error line number is just where the parser conclusively gave up to process it all.
Solving syntax errors
There are many approaches to narrow down and fix syntax hiccups.
Open the mentioned source file. Look at the mentioned code line.
For runaway strings and misplaced operators this is usually where you find the culprit.
Read the line left to right and imagine what each symbol does.
More regularily you need to look at preceding lines as well.
In particular missing ; semicolons are missing at the previous line end / statement. (At least from the stylistic viewpoint. )
If { code blocks } are incorrectly closed or nested, you may need to investigate even further up the source code. Use proper code indendation to simplify that.
Look at the syntax colorization !
Strings and variables and constants should all have different colors.
Operators +-*/. should be be tinted distinct as well. Else they might be in the wrong context.
If you see string colorization extend too far or too short, then you have found an unescaped or missing closing " or ' string marker.
Having two same-colored punctuation characters next to each other can also mean trouble. Usually operators are lone, if it's not ++ or -- or parentheses following an operator. Two strings/identifiers directly following each other are incorrect in most contexts.
Whitespace is your friend.
Follow any coding style.
Break up long lines temporarily.
You can freely add newlines between operators or constants and strings. The parser will then concretise the line number for parsing errors. Instead of looking at very lengthy code, you can isolate the missing or misplaced syntax symbol.
Split up complex if statements into distinct or nested if conditions.
Instead of lengthy math formulas or logic chains, use temporary variables to simplify the code. (More readable = less errors.)
Add newlines between:
Code you can easily identify as correct,
The parts you're unsure about,
And the lines which the parser complains about.
Partitioning up long code blocks really helps locating the origin of syntax errors.
Comment out offending code.
If you can't isolate the problem source, start to comment out (and thus temporarily remove) blocks of code.
As soon as you got rid of the parsing error, you have found the problem source. Look more closely there.
Sometimes you want to temporarily remove complete function/method blocks. (In case of unmatched curly braces and wrongly indented code.)
When you can't resolve the syntax issue, try to rewrite the commented out sections from scratch.
As newcomer avoid some of the confusing syntax constructs.
The ternary ? : condition operator can compact code and is useful indeed. But it doesn't aid readability in all cases. Prefer plain if statements while unversed.
PHPs alternative syntax (if:/elseif:/endif;) is common for templates, but arguably less easy to follow than normal { code } blocks.
The most prevalent newcomer mistakes are:
Missing semicolons ; for terminating statements / lines.
Mismatched string quotes for " or ' and unescaped quotes within.
Forgotten operators, in particular for string . concatenation.
Unbalanced ( parentheses ). Count them in the reported line. Are there an equal number of them?
Don't forget that solving one syntax problem can uncover the next.
If you make one issue go away, but another crops up in some code below, you're mostly on the right path.
If after editing a new syntax error crops up in the same line, then your attempted change was possibly a failure. (Not always though.)
Restore a backup of previously working code, if you can't fix it.
Adopt a source code versioning system. You can always view a diff of the broken and last working version. Which might be enlightening as to what the syntax problem is.
Invisible stray unicode characters: In some cases you need to use a hexeditor or different editor/viewer on your source. Some problems cannot be found just from looking at your code.
Try grep --color -P -n "[\x80-\xFF]" file.php as first measure to find non-ASCII symbols.
In particular BOMs, zero-width spaces, or non-breaking spaces, and smart quotes regularily can find their way into source code.
Take care of which type of linebreaks are saved in files. PHP just honors \n newlines, not \r carriage returns. Which is occasionally an issue for MacOS users (even on OS X for misconfigured editors).
Check your PHP version. Not all syntax constructs are available on every server.
Don't use PHPs reserved keywords as identifiers for functions / methods, classes or constants.
Trial-and-error is your last resort.
If all else fails, you can always google your error message. Syntax symbols aren't as easy to search for (Stack Overflow itself is indexed by SymbolHound though). Therefore it may take looking through a few more pages before you find something relevant.
Further guides:
PHP Debugging Basics by David Sklar
Fixing PHP Errors by Jason McCreary
PHP Errors – 10 Common Mistakes by Mario Lurig
Common PHP Errors and Solutions
How to Troubleshoot and Fix your WordPress Website
A Guide To PHP Error Messages For Designers - Smashing Magazine
White screen of death
If your website is just blank, then typically a syntax error is the cause.
Enable their display with:
error_reporting = E_ALL
display_errors = 1
In your php.ini generally,
or via .htaccess for mod_php,
or even .user.ini with FastCGI setups.
Enabling it within the broken script is too late, because PHP can't even interpret/run the first line. A quick workaround is crafting a wrapper script, say test.php:
ini_set("display_errors", 1);
Then invoke the failing code by accessing this wrapper script.
It also helps to enable PHPs error_log and look into your webservers error.log when a script crashes with HTTP 500 responses.
I think this topic is totally overdiscussed/overcomplicated, using an IDE is THE way to go to completely avoid any syntax errors. I would even say that working without an IDE is kind of unprofessional. Why ? Because modern IDEs check your syntax after every character you type. When you code and your entire line turns red, and a big warning notice shows you the exact type and the exact position of the syntax error, then there's absolutly no need to search for another solution.
Using a syntax-checking IDE means:
You'll (effectively) never run into syntax errors again, simply because you see them right as you type. Seriously.
Excellent IDEs with syntax check (all of them are available for Linux, Win and Mac):
NetBeans [free]
PHPStorm [around 100€/$]
Eclipse (with PHP Plugin) [free]
Sublime [70$] [mainly a text editor, but highly expandable with plugins, like PHP Syntax Parser]
Unexpected [
These days, the unexpected [ array bracket is commonly seen on outdated PHP versions. The short array syntax is available since PHP >= 5.4. Older installations only support array().
$php53 = array(1, 2, 3);
$php54 = [1, 2, 3];
Array function result dereferencing is likewise not avaiable for older PHP versions:
$result = get_whatever()["key"];
Reference - What does this error mean in PHP? - "Syntax error, unexpected [" shows the most common and practical workarounds.
Though, you're always better off just upgrading your PHP installation. For shared webhosting plans, first research if e.g. SetHandler php56-fcgi can be used to enable a newer runtime.
See also:
PHP syntax for dereferencing function result → possible as of PHP 5.4
PHP : syntax error, unexpected '['
Shorthand for arrays: is there a literal syntax like {} or []?
PHP 5.3.10 vs PHP 5.5.3 syntax error unexpected '['
PHP Difference between array() and []
PHP Array Syntax Parse Error Left Square Bracket "["
Btw, there are also preprocessors and PHP 5.4 syntax down-converters if you're really clingy with older + slower PHP versions.
Other causes for Unexpected [ syntax errors
If it's not the PHP version mismatch, then it's oftentimes a plain typo or newcomer syntax mistake:
You can't use array property declarations/expressions in classes, not even in PHP7.
protected $var["x"] = "Nope";
Confusing [ with opening curly braces { or parens ( is a common oversight.
foreach [$a as $b)
Or even:
function foobar[$a, $b, $c] {
Or trying to dereference constants (before PHP 5.6) as arrays:
$var = const[123];
At least PHP interprets that const as constant name.
If you meant to access an array variable (which is the typical cause here), then add the leading $ sigil - so it becomes a $varname.
Unexpected ] closing square bracket
This is somewhat rarer, but there are also syntax accidents with the terminating array ] bracket.
Again mismatches with ) parentheses or } curly braces are common:
function foobar($a, $b, $c] {
Or trying to end an array where there isn't one:
$var = 2];
Which often occurs in multi-line and nested array declarations.
$array = [1,[2,3],4,[5,6[7,[8],[9,10]],11],12]],15];
If so, use your IDE for bracket matching to find any premature ] array closure. At the very least use more spacing and newlines to narrow it down.
The unwieldy names T_CONSTANT_ENCAPSED_STRING and T_ENCAPSED_AND_WHITESPACE refer to quoted "string" literals.
They're used in different contexts, but the syntax issue are quite similar. T_ENCAPSED… warnings occur in double quoted string context, while T_CONSTANT… strings are often astray in plain PHP expressions or statements.
Incorrect variable interpolation
And it comes up most frequently for incorrect PHP variable interpolation:
⇓ ⇓
echo "Here comes a $wrong['array'] access";
Quoting arrays keys is a must in PHP context. But in double quoted strings (or HEREDOCs) this is a mistake. The parser complains about the contained single quoted 'string', because it usually expects a literal identifier / key there.
More precisely it's valid to use PHP2-style simple syntax within double quotes for array references:
echo "This is only $valid[here] ...";
Nested arrays or deeper object references however require the complex curly string expression syntax:
echo "Use {$array['as_usual']} with curly syntax.";
If unsure, this is commonly safer to use. It's often even considered more readable. And better IDEs actually use distinct syntax colorization for that.
Missing concatenation
If a string follows an expression, but lacks a concatenation or other operator, then you'll see PHP complain about the string literal:
print "Hello " . WORLD " !";
While it's obvious to you and me, PHP just can't guess that the string was meant to be appended there.
Confusing string quote enclosures
The same syntax error occurs when confounding string delimiters. A string started by a single ' or double " quote also ends with the same.
print "click here";
That example started with double quotes. But double quotes were also destined for the HTML attributes. The intended concatenation operator within however became interpreted as part of a second string in single quotes.
Tip: Set your editor/IDE to use slightly distinct colorization for single and double quoted strings. (It also helps with application logic to prefer e.g. double quoted strings for textual output, and single quoted strings only for constant-like values.)
This is a good example where you shouldn't break out of double quotes in the first place. Instead just use proper \" escapes for the HTML attributes´ quotes:
print "click here";
While this can also lead to syntax confusion, all better IDEs/editors again help by colorizing the escaped quotes differently.
Missing opening quote
Equivalently are forgotten opening "/' quotes a recipe for parser errors:
make_url(login', 'open');
Here the ', ' would become a string literal after a bareword, when obviously login was meant to be a string parameter.
Array lists
If you miss a , comma in an array creation block, the parser will see two consecutive strings:
array( ⇓
"key" => "value"
"next" => "....",
Note that the last line may always contain an extra comma, but overlooking one in between is unforgivable. Which is hard to discover without syntax highlighting.
Function parameter lists
Same thing for function calls:
myfunc(123, "text", "and" "more")
Runaway strings
A common variation are quite simply forgotten string terminators:
mysql_evil("SELECT * FROM stuffs);
print "'ok'";
Here PHP complains about two string literals directly following each other. But the real cause is the unclosed previous string of course.
See also
PHP - syntax error, unexpected T_CONSTANT_ENCAPSED_STRING
Syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in PHP
Unexpected T_CONSTANT_ENCAPSED_STRING error in SQL Query
Unexpected T_VARIABLE
An "unexpected T_VARIABLE" means that there's a literal $variable name, which doesn't fit into the current expression/statement structure.
Missing semicolon
It most commonly indicates a missing semicolon in the previous line. Variable assignments following a statement are a good indicator where to look:
$var = 1 + 2; # parse error in line +2
String concatenation
A frequent mishap are string concatenations with forgotten . operator:
print "Here comes the value: " $value;
Btw, you should prefer string interpolation (basic variables in double quotes) whenever that helps readability. Which avoids these syntax issues.
String interpolation is a scripting language core feature. No shame in utilizing it. Ignore any micro-optimization advise about variable . concatenation being faster. It's not.
Missing expression operators
Of course the same issue can arise in other expressions, for instance arithmetic operations:
print 4 + 7 $var;
PHP can't guess here if the variable should have been added, subtracted or compared etc.
Same for syntax lists, like in array populations, where the parser also indicates an expected comma , for example:
$var = array("1" => $val, $val2, $val3 $val4);
Or functions parameter lists:
function myfunc($param1, $param2 $param3, $param4)
Equivalently do you see this with list or global statements, or when lacking a ; semicolon in a for loop.
Class declarations
This parser error also occurs in class declarations. You can only assign static constants, not expressions. Thus the parser complains about variables as assigned data:
class xyz { ⇓
var $value = $_GET["input"];
Unmatched } closing curly braces can in particular lead here. If a method is terminated too early (use proper indentation!), then a stray variable is commonly misplaced into the class declaration body.
Variables after identifiers
You can also never have a variable follow an identifier directly:
Btw, this is a common example where the intention was to use variable variables perhaps. In this case a variable property lookup with $this->{"myFunc$VAR"}(); for example.
Take in mind that using variable variables should be the exception. Newcomers often try to use them too casually, even when arrays would be simpler and more appropriate.
Missing parens after language constructs
Hasty typing may lead to forgotten opening parenthesis
for if and for and foreach statements:
foreach $array as $key) {
Solution: add the missing opening ( between statement and variable.
Else does not expect conditions
else ($var >= 0)
Solution: Remove the conditions from else.
See also
Search: unexpected T_VARIABLE
Unexpected $end
When PHP talks about an "unexpected $end", it means that your code ended prematurely. (The message is a bit misleading when taken literally. It's not about a variable named "$end", as sometimes assumed by newcomers. It refers to the "end of file", EOF.)
Cause: Unbalanced { and } for code blocks / and function or class declarations.
It's pretty much always about a missing } curly brace to close preceding code blocks.
Again, use proper indentation to avoid such issues.
Use an IDE with bracket matching, to find out where the } is amiss.
There are keyboard shortcuts in most IDEs and text editors:
Netbeans, PhpStorm, Komodo: Ctrl[ and Ctrl]
Eclipse, Aptana: CtrlShiftP
Atom, Sublime: Ctrlm - Zend Studio CtrlM
Geany, Notepad++: CtrlB - Joe: CtrlG - Emacs: C-M-n - Vim: %
Most IDEs also highlight matching braces, brackets and parens.
Which makes it pretty easy to inspect their correlation:
Unterminated expressions
And Unexpected $end syntax/parser error can also occur for unterminated expressions or statements:
$var = func(1,
So, look at the end of scripts first. A trailing ; is often redundant for the last statement in any PHP script. But you should have one. Precisely because it narrows such syntax issues down.
Indented HEREDOC markers
Another common occurence appears with HEREDOC or NOWDOC strings. The terminating marker goes ignored with leading spaces/tabs/etc.:
print <<< END
# ↑ terminator isn't exactly at the line start
Therefore the parser assumes the HEREDOC string to continue untill the end of the file (hence "Unexpected $end"). Pretty much all IDEs and syntax-highlighting editors will make this obvious or warn about it.
Alternative syntax
Somewhat rarer you can see this syntax error when using the alternative syntax for statement/code blocks in templates. Using if: and else: and a missing endif; for example.
See also:
PHP syntax error “unexpected $end”
Parse error: Syntax error, unexpected end of file in my PHP code
parse error syntax error unexpected end of file php
PHP Parse error: syntax error, unexpected end of file in a Codeigniter View
Parse error: syntax error, unexpected end of file (Registration script)
"Parse error: syntax error, unexpected $end" For my uni registration assignment
Fixing PHP Errors: PHP Error #3: Unexpected end of file
Unexpected (
Opening parentheses typically follow language constructs such as if/foreach/for/array/list or start an arithmetic expression. They're syntactically incorrect after "strings", a previous (), a lone $, and in some typical declaration contexts.
Function declaration parameters
A rarer occurence for this error is trying to use expressions as default function parameters. This is not supported, even in PHP7:
function header_fallback($value, $expires = time() + 90000) {
Parameters in a function declaration can only be literal values or constant expressions. Unlike for function invocations, where you can freely use whatever(1+something()*2) etc.
Class property defaults
Same thing for class member declarations, where only literal/constant values are allowed, not expressions:
class xyz { ⇓
var $default = get_config("xyz_default");
Put such things in the constructor.
See also Why don't PHP attributes allow functions?
Again note that PHP 7 only allows var $xy = 1 + 2 +3; constant expressions there.
Javascript syntax in PHP
Utilizing Javascript or jQuery syntax won't work in PHP for obvious reasons:
<?php ⇓
print $(document).text();
When this happens, it usually indicates an unterminated preceding string; and literal <script> sections leaking into PHP code context.
isset(()), empty, key, next, current
Both isset() and empty() are language built-ins, not functions. They need to access a variable directly. If you inadvertently add a pair of parentheses too much, then you'd create an expression however:
if (isset(($_GET["id"]))) {
Same applies to any language construct that requires implicit variable name access. These built-ins are part of the language grammer, therefore don't permit decorative extra parens.
User-level functions that require a variable reference -but get an expression result passed- lead to runtime errors instead.
Unexpected )
Absent function parameter
You cannot have stray commas last in a function call. PHP expects a value there and thusly complains about an early closing ) parenthesis.
callfunc(1, 2, );
A trailing comma is only allowed in array() or list() constructs.
Unfinished expressions
If you forget something in an arithmetic expression, then the parser gives up. Because how should it possibly interpret that:
$var = 2 * (1 + );
And if you forgot the closing ) even, then you'd get a complaint about the unexpected semicolon instead.
Foreach as constant
For forgotten variable $ prefixes in control statements you will see:
↓ ⇓
foreach ($array as wrong) {
PHP here sometimes tells you it expected a :: instead. Because a class::$variable could have satisfied the expected $variable expression..
Unexpected {
Curly braces { and } enclose code blocks. And syntax errors about them usually indicate some incorrec nesting.
Unmatched subexpressions in an if
Most commonly unbalanced ( and ) are the cause if the parser complains about the opening curly { appearing too early. A simple example:
if (($x == $y) && (2 == true) {
Count your parens or use an IDE which helps with that. Also don't write code without any spaces. Readability counts.
{ and } in expression context
You can't use curly braces in expressions. If you confuse parentheses and curlys, it won't comply to the language grammer:
$var = 5 * {7 + $x};
There are a few exceptions for identifier construction, such as local scope variable ${references}.
Variable variables or curly var expressions
This is pretty rare. But you might also get { and } parser complaints for complex variable expressions:
print "Hello {$world[2{]} !";
Though there's a higher likelihood for an unexpected } in such contexts.
Unexpected }
When getting an "unexpected }" error, you've mostly closed a code block too early.
Last statement in a code block
It can happen for any unterminated expression.
And if the last line in a function/code block lacks a trailing ; semicolon:
function whatever() {
} ⇧
Here the parser can't tell if you perhaps still wanted to add + 25; to the function result or something else.
Invalid block nesting / Forgotten {
You'll sometimes see this parser error when a code block was } closed too early, or you forgot an opening { even:
function doStuff() {
if (true) ⇦
print "yes";
} ⇧
In above snippet the if didn't have an opening { curly brace. Thus the closing } one below became redundant. And therefore the next closing }, which was intended for the function, was not associatable to the original opening { curly brace.
Such errors are even harder to find without proper code indentation. Use an IDE and bracket matching.
Unexpected {, expecting (
Language constructs which require a condition/declaration header and a code block will trigger this error.
Parameter lists
For example misdeclared functions without parameter list are not permitted:
function whatever {
Control statement conditions
And you can't likewise have an if without condition.
if {
Which doesn't make sense, obviously. Same thing for the usual suspects, for/foreach and while/do etc.
If you've got this particular error, you definitely should look up some manual examples.
Unexpected T_STRING
T_STRING is a bit of a misnomer. It does not refer to a quoted "string". It means a raw identifier was encountered. This can range from bare words to leftover CONSTANT or function names, forgotten unquoted strings, or any plain text.
Misquoted strings
This syntax error is most common for misquoted string values however. Any unescaped and stray " or ' quote will form an invalid expression:
⇓ ⇓
echo "click here";
Syntax highlighting will make such mistakes super obvious. It's important to remember to use backslashes for escaping \" double quotes, or \' single quotes - depending on which was used as string enclosure.
For convenience you should prefer outer single quotes when outputting plain HTML with double quotes within.
Use double quoted strings if you want to interpolate variables, but then watch out for escaping literal " double quotes.
For lengthier output, prefer multiple echo/print lines instead of escaping in and out. Better yet consider a HEREDOC section.
See also What is the difference between single-quoted and double-quoted strings in PHP?
Unclosed strings
If you miss a closing " then a syntax error typically materializes later. An unterminated string will often consume a bit of code until the next intended string value:
echo "Some text", $a_variable, "and some runaway string ;
It's not just literal T_STRINGs which the parser may protest then. Another frequent variation is an Unexpected '>' for unquoted literal HTML.
Non-programming string quotes
If you copy and paste code from a blog or website, you sometimes end up with invalid code. Typographic quotes aren't what PHP expects:
$text = ’Something something..’ + ”these ain't quotes”;
Typographic/smart quotes are Unicode symbols. PHP treats them as part of adjoining alphanumeric text. For example ”these is interpreted as constant identifier. But any following text literal is then seen as bareword/T_STRING by the parser.
The missing semicolon; again
If you have an unterminated expression in previous lines, then any following statement or language construct gets seen as raw identifier:
PHP just can't know if you meant to run two functions after another, or if you meant to multiply their results, add them, compare them, or only run one || or the other.
Short open tags and <?xml headers in php scripts
This is rather uncommon. But if short_open_tags are enabled, then you can't begin your PHP scripts with an XML declaration:
<?xml version="1.0"?>
PHP will see the <? and reclaim it for itself. It won't understand what the stray xml was meant for. It'll get interpreted as constant. But the version will be seen as another literal/constant. And since the parser can't make sense of two subsequent literals/values without an expression operator in between, that'll be a parser failure.
Invisible Unicode characters
A most hideous cause for syntax errors are Unicode symbols, such as the non-breaking space. PHP allows Unicode characters as identifier names. If you get a T_STRING parser complaint for wholly unsuspicious code like:
print 123;
You need to break out another text editor. Or an hexeditor even. What looks like plain spaces and newlines here, may contain invisible constants. Java-based IDEs are sometimes oblivious to an UTF-8 BOM mangled within, zero-width spaces, paragraph separators, etc. Try to reedit everything, remove whitespace and add normal spaces back in.
You can narrow it down with with adding redundant ; statement separators at each line start:
;print 123;
The extra ; semicolon here will convert the preceding invisible character into an undefined constant reference (expression as statement). Which in return makes PHP produce a helpful notice.
Unexpected T_IS_EQUAL
Unexpected T_IS_NOT_EQUAL
Unexpected <
Unexpected >
Comparison operators such as ==, >=, ===, !=, <>, !== and <= or < and > mostly should be used just in expressions, such as if expressions. If the parser complains about them, then it often means incorrect paring or mismatched ( ) parens around them.
Parens grouping
In particular for if statements with multiple comparisons you must take care to correctly count opening and closing parenthesis:
if (($foo < 7) && $bar) > 5 || $baz < 9) { ... }
Here the if condition here was already terminated by the )
Once your comparisons become sufficiently complex it often helps to split it up into multiple and nested if constructs rather.
isset() mashed with comparing
A common newcomer is pitfal is trying to combine isset() or empty() with comparisons:
if (empty($_POST["var"] == 1)) {
Or even:
if (isset($variable !== "value")) {
This doesn't make sense to PHP, because isset and empty are language constructs that only accept variable names. It doesn't make sense to compare the 

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