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<?php $a=['z','Z','ą', 'Ą', 'a', 'o','ó','Ó','ł','Ł','ź','A','Ż','l','ę','L','e','ć','ń','ś']; $a=array_map($a, function($a){return mb_strtolower($a);}); $coll = new Collator( 'pl_PL' ); var_export( $a ); $coll->sort( $a ); var_export( $a );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, array callback must have exactly two members in /in/Np53K:4 Stack trace: #0 /in/Np53K(4): array_map(Array, Object(Closure)) #1 {main} thrown in /in/Np53K on line 4
Process exited with code 255.

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