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<?php var_dump(array_filter(['foo'=>'bar','baz'=>'quix'],function($a){ var_dump("$a => \$b"); }));
Output for 5.4.0 - 7.1.0
string(9) "bar => $b" string(10) "quix => $b" array(0) { }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/idi0Q on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/idi0Q on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/idi0Q on line 2
Process exited with code 255.