Keep Coding

I've been doing a file_get_contents code for a while now, and I'm getting really tired of using my method to replace multiple different words at once. Sometimes the site I'm file_get_contents from, has changed their layout and therefore has to change up in all this mess.
This is the method I'm using:
$results = file_get_contents('https://example.com/');
$filter1 = str_replace('https://example.com', 'index.php', $results);
$filter2 = str_replace('<script', '<!-- OVERWRITTEN ', $filter1);
$filter3 = str_replace('</script>', ' OVERWRITTEN -->', $filter2);
$filter4 = str_replace('src="http://example.com', 'src="', $filter3);
$output = str_replace('<p>Some Text</p>', '<p>Something Else</p>',$filter4);
echo $output;
Is it a better and cleaner way of replacing multiple different words at once than I have done? I'm not sure about extra delay that PHP has to handle with such mess

Yep, you can do it by sending in arrays:
$results = file_get_contents('https://example.com/');
$output = str_replace(
array('https://example.com', '<script', '</script>', 'src="http://example.com', '<p>Some Text</p>'),
array('index.php', '<!-- OVERWRITTEN ', ' OVERWRITTEN -->', 'src="', '<p>Something Else</p>'),
$results
);
echo $output;
For clarity, the replace code is:
$output = str_replace(
array('https://example.com', '<script', '</script>', 'src="http://example.com', '<p>Some Text</p>'),
array('index.php', '<!-- OVERWRITTEN ', ' OVERWRITTEN -->', 'src="', '<p>Something Else</p>'),
$results
);