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@ 2014-07-30T09:37:11Z

<?php

$string = "This is my test string {ABC}. This is test {XYZ}. I am new for PHP {PHP}".

$i = 1;
echo preg_replace_callback('/\{(.+?)\}/', function (array $match) use (&$i) {
    return sprintf('{%s %d}', $match[1], $i++);
}, $string);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
sprintf: documentation ( source)

preferences:dark modelive preview

38.89 ms | 402 KiB | 5 Q