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run code in 300+ PHP versions simultaneously
<?php $in = [0]; $out = array_filter($in, function(&$v) { $v = 1; return 1; }); var_dump($in, $out);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: {closure}(): Argument #1 ($v) must be passed by reference, value given in /in/8dlfb on line 4 array(1) { [0]=> int(0) } array(1) { [0]=> int(0) }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: {closure}(): Argument #1 ($v) must be passed by reference, value given in /in/8dlfb on line 4 array(1) { [0]=> int(0) } array(1) { [0]=> int(0) }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
array(1) { [0]=> int(0) } array(1) { [0]=> int(0) }
Output for 5.6.0 - 5.6.25
array(1) { [0]=> int(1) } array(1) { [0]=> int(1) }

preferences:
175.06 ms | 401 KiB | 184 Q