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run code in 200+ php & hhvm versions
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<?php $list = [ 'foo' => 'bar', 'foobar' => 'bar', 'bar' => 'foo', ]; var_dump(array_filter($list, function ($key, $value) { return $value === 'bar'; }));
based on oPX72
Output for 7.1.0 - 7.2.0
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/CDTqk:10 Stack trace: #0 [internal function]: {closure}('bar') #1 /in/CDTqk(12): array_filter(Array, Object(Closure)) #2 {main} thrown in /in/CDTqk on line 10
Process exited with code 255.
Output for 5.4.9 - 7.0.20
Warning: Missing argument 2 for {closure}() in /in/CDTqk on line 10 Notice: Undefined variable: value in /in/CDTqk on line 11 Warning: Missing argument 2 for {closure}() in /in/CDTqk on line 10 Notice: Undefined variable: value in /in/CDTqk on line 11 Warning: Missing argument 2 for {closure}() in /in/CDTqk on line 10 Notice: Undefined variable: value in /in/CDTqk on line 11 array(0) { }
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/CDTqk on line 3
Process exited with code 255.