3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array('string1' , 'string2' , 'string3'); echo implode($array);
based on SVLj3
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.26, 7.4.0 - 7.4.14, 8.0.0 - 8.0.2
string1string2string3