3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = ["m" => 0,"b" => 1, "k" => 2,"a" => 3]; echo current($arr); // what is current position next($arr); // move current position echo current($arr); // mwhat is current position $key = array_keys($arr)[0]; echo current($arr); // make sure the position has not changed echo $key;
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
011m
Output for 5.3.0
Parse error: syntax error, unexpected '[' in /in/bhoEZ on line 3
Process exited with code 255.
preferences:
93.47 ms | 1959 KiB | 4 Q