CODEWITHSUNDEEP
phppreg-replace
Ali
Ali

Reputation: 22337

Strip PHP tags preg_replace

I want to remove all php tags from a external text so it can be included in php safely.

this is the sample input:

<?
?>
<html>
<?php ?>
<?= ?>
</html>
<?

or any other possibilites

and output:

<html>
</html>

the last php open tag may not have an end tag!

Upvotes: 0

Views: 1522

Answers (2)

Brilliand
Brilliand

Reputation: 13724

The proper way to do this is to not include it, but instead load it as a string, using file_get_contents(). That will preserve the PHP tags without executing them. However, the following regex will do exactly what you asked for:

#<\?.*?(\?>|$)#s

Here's a breakdown of what that string represents:

#       A delimiter marking the beginning and end of the expression - nearly anything will do (preferably something not in the regex itself)
<\?      Find the text "<?", which is the beginning of a PHP tag.  Note that a backslash before the question mark is needed because question marks normally do something special in regular expressions.
.*?     Include as much text as necessary (".*"), but as little as possible ("?").
(\?>|$)  Stop at an ending PHP tag ("?>"), OR the end of the text ("$").  This doesn't necessarily have to stop at the first one, but since the previous part is "as little as possible", it will.
#       The same delimiter, marking the end of the expression
s       A special flag, indicating that the pattern can span multiple lines.  Without it, the regex would expect to find the entire PHP tag (beginning and end) on a single line.

Upvotes: 2

user153275
user153275

Reputation:

I don't think there is a great way to do exactly what you want, but if it's acceptable to send the PHP tags (unparsed) in the output you can just use:

<?php echo file_get_contents('input.html'); ?>

Otherwise, maybe have a look at the token_get_all method:

http://www.php.net/manual/en/function.token-get-all.php

You could iterate over all results and only return those of type T_INLINE_HTML:

$toks = token_get_all( file_get_contents( 'input.html' ) );
foreach( $toks as $tok ) {
  if( $tok[0] == T_INLINE_HTML )   {
    print $tok[1];
  }
}

Upvotes: 3

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