PHP preg_replace Backreferencing

Question

So I tried to get this backreferences to work, but I can't figure it out for the life of me.

Currently I have this string <% size_../files/file.rar %> and I need to replace it with the actual file size.

This is what I have so far.

$oldStr = "<% size_../files/file.rar %>";
$newStr = preg_replace("/<% size_(\w+) %>/", filesize("$1"), $oldStr);

Basically I need to get the pattern (\w+) and use it for via filesize function.

You need to use preg_replace_callback() + \w -> [\w./] — Rizier123
– Rizier123, Commented Dec 20, 2015 at 9:02

Snorre Løvås · Accepted Answer · 2015-12-20 09:50:44Z

1

\w is only [A-Za-z0-9_] so you need to handle other characters, spaces etc. Either add all the types you need or maybe match everything up to ' %>'.

You can use preg_replace and then get the file size afterwards or use preg_replace_callback.

A couple of examples:

$oldStr = "<% size_../files/file with spaces.rar %>";

$size1 = preg_replace_callback("/<% size_([\w\.\/\s]+) %>/", 
    function ($matches) {
        return filesize($matches[1]);
    }, 
    $oldStr);


$newStr = preg_replace("/<% size_(.+) %>/", "$1", $oldStr);
if (is_file($newStr)) {
    $size2 = filesize($newStr);
} else {
    //not a file
}

answered Dec 20, 2015 at 9:50

Snorre Løvås

2712 silver badges5 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

PHP preg_replace Backreferencing

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related