preg_replace_callback仅替换第一次出现

Question

I have the regex to find all numbers with percentage (100|\d\d|\d)\% - this regex is given and I am not allowed to change it. I have input string:

Lorem ipsum 10% dolor, 8%sit amet 50%

I need then to highligh (with HTML tags) parts of string according to that regex so I'd get

Lorem ipsum <i>10%</i> dolor, <i>8%</i>sit amet <i>50%</i> 

Because preg_replace would work only with regex like (100%|\d\d%|\d%) otherwise it would highlight only numbers 0-100. I am using preg_replace_callback like this:

<?php
    $string = "Lorem ipsum 10% dolor, 8%sit amet 50%";
      $count = 0;
        function foo($matches){
            global $count;
            return "<i>".$matches[$count++]."</i>";

        }
        $reg = "/(100|\d\d|\d)\%/";
        $str_out = preg_replace_callback($reg, "foo", $string, PREG_PATTERN_ORDER);
?>

The output is this though:

Lorem ipsum <i>10%</i> dolor, 8%sit amet 50%

Only first occurence is replaced.

Answer 1

You can use preg_replace also:

$reg = '/(100|\d\d|\d)%/';
$repl = preg_replace( $reg, '<i>$0</i>', $input);

RegEx Demo