3v4l.org

run code in 300+ PHP versions simultaneously
<?php $myarr = array("world cup"); foreach($myarr as $v){ if(strpos($v,'o')!==false) $myarr[] = str_replace('o','O',$v); if(strpos($v,'O')!==false) $myarr[] = str_replace('O','o',$v); } var_export($myarr);
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 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array ( 0 => 'world cup', 1 => 'wOrld cup', )
preferences:
196.03 ms | 406 KiB | 328 Q