3v4l.org

run code in 300+ PHP versions simultaneously
<?php /*function add($a, $b){ return $a + $b; } echo add(2,3); function subtract ($a, $b){ return $a - $b; } echo subtract(5,4);*/ function concatenate($a, $b){ return $a + $b; } echo concatenate('Hello', 'Wie');
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /in/9GGGj:16 Stack trace: #0 /in/9GGGj(18): concatenate('Hello', 'Wie') #1 {main} thrown in /in/9GGGj on line 16
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: A non-numeric value encountered in /in/9GGGj on line 16 Warning: A non-numeric value encountered in /in/9GGGj on line 16 0
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, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20
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206.19 ms | 403 KiB | 309 Q