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<?php function acasesort($a, $b) { return strcasecmp($a, $b); } class A { function B() { $tags = array('Test', 'tests', 'tes', 'abc'); usort($tags, acasesort); var_dump($tags); } } (new A)->B();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "acasesort" in /in/omO3H:10 Stack trace: #0 /in/omO3H(15): A->B() #1 {main} thrown in /in/omO3H on line 10
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant acasesort - assumed 'acasesort' (this will throw an Error in a future version of PHP) in /in/omO3H on line 10 array(4) { [0]=> string(3) "abc" [1]=> string(3) "tes" [2]=> string(4) "Test" [3]=> string(5) "tests" }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Notice: Use of undefined constant acasesort - assumed 'acasesort' in /in/omO3H on line 10 array(4) { [0]=> string(3) "abc" [1]=> string(3) "tes" [2]=> string(4) "Test" [3]=> string(5) "tests" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/omO3H on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/omO3H on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/omO3H on line 15
Process exited with code 255.
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