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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']; $a=array_map( function($a){return mb_strtolower($a, 'utf-8');}, $a); $coll = new Collator( 'pl_PL' ); var_export( $a ); $coll->sort( $a ); var_export( $a );
Output for 5.5.24 - 5.5.28, 5.5.31 - 5.5.33, 5.5.35, 5.6.8 - 5.6.12, 5.6.16 - 5.6.19, 5.6.21 - 5.6.28, 7.0.0 - 7.0.4, 7.0.6 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array ( 0 => 'z', 1 => 'z', 2 => 'ą', 3 => 'ą', 4 => 'a', 5 => 'o', 6 => 'ó', 7 => 'ó', 8 => 'ł', 9 => 'ł', 10 => 'ź', 11 => 'a', 12 => 'ż', 13 => 'l', 14 => 'ę', 15 => 'l', 16 => 'e', 17 => 'ć', 18 => 'ń', 19 => 'ś', )array ( 0 => 'a', 1 => 'a', 2 => 'ą', 3 => 'ą', 4 => 'ć', 5 => 'e', 6 => 'ę', 7 => 'l', 8 => 'l', 9 => 'ł', 10 => 'ł', 11 => 'ń', 12 => 'o', 13 => 'ó', 14 => 'ó', 15 => 'ś', 16 => 'z', 17 => 'z', 18 => 'ź', 19 => 'ż', )
Output for 8.0.13
Fatal error: Uncaught Error: Class "Collator" not found in /in/kbBVU:5 Stack trace: #0 {main} thrown in /in/kbBVU on line 5
Process exited with code 255.
Output for 7.0.5, 7.3.32 - 7.3.33, 7.4.33
Fatal error: Uncaught Error: Class 'Collator' not found in /in/kbBVU:5 Stack trace: #0 {main} thrown in /in/kbBVU on line 5
Process exited with code 255.
Output for 5.5.29 - 5.5.30, 5.5.34, 5.6.13 - 5.6.15, 5.6.20
Fatal error: Class 'Collator' not found in /in/kbBVU on line 5
Process exited with code 255.

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