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<?php $entry = array( 0 => 'foo', 1 => false, 2 => -1, 3 => null, 4 => '' ); var_dump(array_filter($entry)); var_dump(array_filter($entry, 'isset'));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(3) "foo" [2]=> int(-1) } Fatal error: Uncaught TypeError: array_filter(): Argument #2 ($callback) must be a valid callback or null, function "isset" not found or invalid function name in /in/cDdjV:12 Stack trace: #0 /in/cDdjV(12): array_filter(Array, 'isset') #1 {main} thrown in /in/cDdjV on line 12
Process exited with code 255.

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