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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 git.master, git.master_jit, rfc.property-hooks
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.

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