3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_content = '$1$2'; preg_match('#(.*)#',$_content, $matches); $_content = preg_replace('#(.*)#', '<span name="iframe_stretch">$1</span>', $_content); echo $_content; var_dump($matches);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<span name="iframe_stretch">$1$2</span><span name="iframe_stretch"></span>array(2) { [0]=> string(4) "$1$2" [1]=> string(4) "$1$2" }

preferences:
230.96 ms | 406 KiB | 349 Q