Is there a way to pass another parameter in the preg_replace_callback callback function?

It is hard to pass arguments to callbacks, but instead of this:

return preg_replace_callback($this->reg, 'Foo::Bar', $this->string);

You could make Bar() not static, and use this:

return preg_replace_callback($this->reg, array($this, 'Bar'), $this->string);

Then the callback function will be able to see $this

See 'callback' in Pseudo-types and variables

Also in PHP >=5.3 you could use anonymous functions/closures to pass other data to callback functions.

I got stuck while trying to pass an argument (extra parameter) to a callback with the create_function() and call_user_function() methods.

This is for reference:

<?php$pattern = "/([MmT][a-z]*)/";$string = "Mary is a naughty girl because she took all my animals.";$kill = "Mary";echo preg_replace_callback($pattern, function($ma) use ($kill) {    foreach ($ma as $m){        if ($m == $kill){            return "Jenny";        }        return "($m)";    }}, $string);echo "\n";?>

$ php preg_replace_callback.php Jenny is a naughty girl because she took all (my) ani(mals).

yes I use something like this to set and unset a changing variable so that it is available to the callback function and you don't need the newer php to do it:

foreach ($array as $key) {    $this->_current_key = $key;    preg_replace_callback($regex, array($this, '_callback'), $content);    unset($this->_current_key);}

then in the callback function $this->_current_key is available:

function _callback ($match) {        //use the key to do something    new_array[$key] = $match[0];    //and still remove found string    return '';}