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<?php $subset = [1,2,3]; $array = [2,1,5]; var_dump(array_intersect($subset, $array)); $patched = array_intersect($array, $subset); sort($patched); sort($subset); var_dump($array); var_dump($subset); var_dump($patched);
Output for 7.2.0, 7.3.24 - 7.3.33, 7.4.12 - 7.4.33, 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
array(2) { [0]=> int(1) [1]=> int(2) } array(3) { [0]=> int(2) [1]=> int(1) [2]=> int(5) } array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } array(2) { [0]=> int(1) [1]=> int(2) }
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 array(2) { [0]=> int(1) [1]=> int(2) } array(3) { [0]=> int(2) [1]=> int(1) [2]=> int(5) } array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } array(2) { [0]=> int(1) [1]=> int(2) }

preferences:
130.28 ms | 402 KiB | 119 Q