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<?php $value = 2; $array = [1, 2, 3]; array_unshift($array,$value); // prepend a duplicate var_export(array_unique($array)); // kill the original echo "\n---\n"; $value = 2; $array = [1, 2, 3]; var_export(array_unique(array_merge([$value],$array))); // prepend a duplicate, kill the original
Output for 5.6.38, 7.0.33, 7.1.0 - 7.1.33, 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 ( 0 => 2, 1 => 1, 3 => 3, ) --- array ( 0 => 2, 1 => 1, 3 => 3, )
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 ( 0 => 2, 1 => 1, 3 => 3, ) --- array ( 0 => 2, 1 => 1, 3 => 3, )

preferences:
166.23 ms | 402 KiB | 208 Q