Warning: preg_replace_callback(): Requires argument 2, '…', to be a valid callback

[PhilD123]

I am getting the following warning on my wordpress website after doing an update.

Warning: preg_replace_callback(): Requires argument 2, 'stripslashes(strstr("\1", "columns=\"$columns\"") ? "\1" : "[gallery \2 \4 columns=\"$columns\"]")', to be a valid callback

I have a very basic PHP knowledge and need to get rid of this warning quickly so any help will be greatly appreciated.

Below is the code:

//FORCE GALLERY TO HAVE NO LINE BREAKS, allows for max columns..

function gallery_columns($content){
$columns = 0;
$pattern = array(
'#(\[gallery(.*?)columns="([0-9])"(.*?)\])#ie',
'#(\[gallery\])#ie',
'#(\[gallery(.*?)\])#ie'
);
$replace = 'stripslashes(strstr("\1", "columns=\"$columns\"") ? "\1" : " [gallery \2 \4 columns=\"$columns\"]")';

return preg_replace_callback($pattern, $replace, $content);

}

Please Help

[codefossa]

Your parameters aren't quite right for preg_replace_callback().

 

 

<?php
 
$new_str = preg_replace_callback('/regexp/', function($m)
{
    // $m is an array of the current match
}, $str);
 
?>