Using a PHP function in conjunction with a regular expression match [duplicate] - php

Question

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calling function inside preg_replace thats inside a function
(2 answers)
Closed 8 years ago.
I'm trying to come up with a way to find all RegEx matches in a string, then run all of those matches through a function that I've written, but I'm having no luck.
Specifically, I'm trying to find all email addresses in a string and then use a function to convert those addresses into useful mailto links that hide the addresses from spam bots.
So I start with plain old RegEx to turn the addresses into mailto links, just so I know that the matches are working.
$pattern = '#([0-9a-z]([-_.]?[0-9a-z])*#[0-9a-z]([-.]?[0-9a-z])*\\.[a-wyz][a-z](fo|g|l|m|mes|o|op|pa|ro|seum|t|u|v|z)?)#i';
$replacement = "<a href='mailto:\\1'>\\1</a>";
$description = preg_replace($pattern, $replacement, $description);
Works great. So far, so good. But when I try to use my function to manipulate the address string, email addresses are no longer matched.
$pattern = '#([0-9a-z]([-_.]?[0-9a-z])*#[0-9a-z]([-.]?[0-9a-z])*\\.[a-wyz][a-z](fo|g|l|m|mes|o|op|pa|ro|seum|t|u|v|z)?)#i';
$replacement = myFunction('\\1');
$description = preg_replace($pattern, $replacement, $description);
What am I doing wrong?

Answer 1

$description = preg_replace_callback($pattern, 'myFunction', $description);
Check preg_replace_callback() on manual to understand how it works.
Your myFunction() function should be coded like that:
function myFunction($matches)
{
return sprintf('%s', $matches[1], $matches[1]);
}
Using preg_replace_callback() with a closure (PHP 5.3+):
$description = preg_replace_callback($pattern, function ($matches) {
return myFunction($matches[1]);
}, $description);