3v4l.org

run code in 500+ PHP versions simultaneously
<?=($f=count_chars)($a=$argv[1],3)==$f($a**3,3);
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '(', expecting ',' or ';' in /in/UsWn4 on line 1
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Notice: Use of undefined constant count_chars - assumed 'count_chars' in /in/UsWn4 on line 1 Notice: Undefined offset: 1 in /in/UsWn4 on line 1
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Warning: Use of undefined constant count_chars - assumed 'count_chars' (this will throw an Error in a future version of PHP) in /in/UsWn4 on line 1 Notice: Undefined offset: 1 in /in/UsWn4 on line 1
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
Fatal error: Uncaught Error: Undefined constant "count_chars" in /in/UsWn4:1 Stack trace: #0 {main} thrown in /in/UsWn4 on line 1
Output for 7.3.32 - 7.3.33
Warning: Use of undefined constant count_chars - assumed 'count_chars' (this will throw an Error in a future version of PHP) in /in/UsWn4 on line 1

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32.91 ms | 1154 KiB | 17 Q