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<?php $a = [[1, 2], [1, 2]]; $a["b"] = [1, 3]; $a["a"] = [1, 3]; $a[5] = [1, 3]; array_unshift($a, [3, 4]); print_r($a);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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] => Array ( [0] => 3 [1] => 4 ) [1] => Array ( [0] => 1 [1] => 2 ) [2] => Array ( [0] => 1 [1] => 2 ) [b] => Array ( [0] => 1 [1] => 3 ) [a] => Array ( [0] => 1 [1] => 3 ) [3] => Array ( [0] => 1 [1] => 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] => Array ( [0] => 3 [1] => 4 ) [1] => Array ( [0] => 1 [1] => 2 ) [2] => Array ( [0] => 1 [1] => 2 ) [b] => Array ( [0] => 1 [1] => 3 ) [a] => Array ( [0] => 1 [1] => 3 ) [3] => Array ( [0] => 1 [1] => 3 ) )

preferences:
118.24 ms | 403 KiB | 173 Q