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<?php $a = [1 => 1, 2 => 2, 3 => "1", 'a' => 'a']; var_dump( array_unique($a, SORT_REGULAR), array_unique($a, SORT_STRING) );
Output for 7.0.33, 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 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(3) { [1]=> int(1) [2]=> int(2) ["a"]=> string(1) "a" } array(3) { [1]=> int(1) [2]=> int(2) ["a"]=> string(1) "a" }
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(3) { [1]=> int(1) [2]=> int(2) ["a"]=> string(1) "a" } array(3) { [1]=> int(1) [2]=> int(2) ["a"]=> string(1) "a" }
Output for 5.6.38
array(4) { [1]=> int(1) [2]=> int(2) [3]=> string(1) "1" ["a"]=> string(1) "a" } array(3) { [1]=> int(1) [2]=> int(2) ["a"]=> string(1) "a" }

preferences:
135.25 ms | 401 KiB | 154 Q