3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = "<img /><img />'; $i = -1; $test = preg_replace_callback( '/<img /', function($matches){ $i++; return '<img onclick='lightbox($i)"'; },$string); print_r( $test );
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.6
Parse error: syntax error, unexpected '';' (T_ENCAPSED_AND_WHITESPACE) in /in/FA21u on line 7
Process exited with code 255.

preferences:
167.63 ms | 1387 KiB | 35 Q