CODEWITHSUNDEEP
phppreg-replace
emc
emc

Reputation: 507

PHP Dynamic preg_replace

$end = preg_replace($pattern, $replacement, $str);

How can I make the replacement string $replacement vary with each match in $str? For example, I want to replace each matched string with an associated image. Something about callbacks... right?

Upvotes: 2

Views: 942

Answers (2)

mario
mario

Reputation: 145482

Yes, something with callbacks. Specifically preg_replace_callback, which makes repeated calls redundant. For a list of things to replace:

 $src = preg_replace_callback('/(thing1|thing2|thing3)/', 'cb_vars', $src);

Where the callback can do some form of lookup or conversion:

 function cb_vars($m) {
     return strtoupper($m[1]);
 }

Likewise can you do that inline with the normal preg_replace and the /e modifier.

Upvotes: 3

Jon
Jon

Reputation: 437376

You need to either use preg_replace_callback, or the /e modifier in the pattern string. The first is more powerful, but the second is more convenient if you are only after something relatively simple.

Upvotes: 3

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