How to know the match count in preg_replace_callback - PHP

Question

I have this code in php -:

function pregRepler($matches)
{
    * do something
}

$str = preg_replace_callback($reg_exp,'pregRepler',$str);

When in function pregRepler, i would want to know the current match number like if it is the first match or the second or anything...

How do i do it.??

I know its an old question but since PHP 5.1.0 a "count" variable has been added. You can use it to get the count. `preg_replace_callback ($regex, callback_function, $subject, $limit, &$count)` — Kalimah, Jan 06 '19 at 11:07

score 7 · Accepted Answer · edited May 23 '17 at 12:00

7

Try something like this:

function pregRepler($matches) {
    static $matchcount = 0;
    // do stuff
    $matchcount++;
}

This works better with an anonymous function, as I mentioned in my answer to your other question, as this will avoid problems if you have multiple calls to preg_replace_callback.

edited May 23 '17 at 12:00

Community

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answered Apr 10 '13 at 20:27

Niet the Dark Absol

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@Kolink shouldn't you define the static outside the function? Will this not reset $matchcount to 0 on every call? – nl-x Apr 10 '13 at 20:39
@nl-x No, the variable is static, so it will only be defined and initialized once. – nickb Apr 10 '13 at 20:48
@M8R-1jmw5r That counts the total for use outside the callback, not the running count inside it. – Niet the Dark Absol Apr 10 '13 at 21:10
@RayZ If my answers helped you, please consider marking them as Accepted by clicking the check mark under the post's score. – Niet the Dark Absol Apr 10 '13 at 21:16

M8R-1jmw5r · Answer 2 · 2013-04-10T21:16:49.203

You need to share a $count variable between both variable scopes, for example by using a variable alias:

$callback = function($matches) use (&$count) {
    $count++;
    return sprintf("<%d:%s>", $count, $matches[0]);
};

echo preg_replace_callback($pattern, $callback , $subject, $limit = -1, $count);

Before invoking, $count is equal to 0. After invoking $count is set to the number of replacements done. In between you can count up in your callback. You can also set to zero again when calling another time.

See it in action

See http://php.net/preg_replace_callback

score 0 · Answer 3 · answered Apr 10 '13 at 20:27

0

$repled     = 0;
function pregRepler($matches)
{
    * do something
    global $repled;
    $repled++;
}

$str = preg_replace_callback($reg_exp,'pregRepler',$str);

Just count from a global variable.

answered Apr 10 '13 at 20:27

Luceos

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How to know the match count in preg_replace_callback - PHP

3 Answers3