Question

I have the following text and want to replace all instace which begin and end with ##, how can i prepare regular expression for preg_replace php.
Example

We are encountering a problem ##anytext## and will update you soon
regarding this problem ##textsomethingelse##

My question how can i replace all instance of ##anytext## with specific text?

Answer 1

You probably need to use preg_replace_callback for this task.

And an example:

<?php
$replacements = array(
    'anytext' => 'ANYTEXT',
    'else' => 'ELSE',
);
echo preg_replace_callback(
    '/##(.*?)##/',
    create_function(
        '$matches',
        'global $replacements; return $replacements[ $matches[1] ];'
    ),
    'We are encountering a problem ##anytext## and will update you soon regarding this problem ##else##'
);

Note: This example uses create_function, but if you’re on PHP >= 5.3 you’re better of using a closure.