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run code in 150+ php & hhvm versions
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<?php interface FilterInterface { public function filter($value); } class StringTrimFilter implements FilterInterface { public function filter($value) { return trim($value); } public function __invoke($value) { var_dump(func_get_args()); return $this->filter($value); } } $array = array( ' string 1 ', 'string 2', 'string 3 ', ); foreach (new CallbackFilterIterator(new ArrayIterator($array), new StringTrimFilter()) as $value) { var_dump($value); }
based on hSkl1
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
array(3) { [0]=> string(10) " string 1 " [1]=> int(0) [2]=> object(ArrayIterator)#2 (1) { ["storage":"ArrayIterator":private]=> array(3) { [0]=> string(10) " string 1 " [1]=> string(8) "string 2" [2]=> string(11) "string 3 " } } } string(10) " string 1 " array(3) { [0]=> string(8) "string 2" [1]=> int(1) [2]=> object(ArrayIterator)#2 (1) { ["storage":"ArrayIterator":private]=> array(3) { [0]=> string(10) " string 1 " [1]=> string(8) "string 2" [2]=> string(11) "string 3 " } } } string(8) "string 2" array(3) { [0]=> string(11) "string 3 " [1]=> int(2) [2]=> object(ArrayIterator)#2 (1) { ["storage":"ArrayIterator":private]=> array(3) { [0]=> string(10) " string 1 " [1]=> string(8) "string 2" [2]=> string(11) "string 3 " } } } string(11) "string 3 "
Output for hhvm-3.10.0 - 3.12.0
array(3) { [0]=> string(10) " string 1 " [1]=> int(0) [2]=> object(ArrayIterator)#2 (2) { ["storage":"ArrayIterator":private]=> array(3) { [0]=> string(10) " string 1 " [1]=> string(8) "string 2" [2]=> string(11) "string 3 " } ["flags":"ArrayIterator":private]=> int(0) } } string(10) " string 1 " array(3) { [0]=> string(8) "string 2" [1]=> int(1) [2]=> object(ArrayIterator)#2 (2) { ["storage":"ArrayIterator":private]=> array(3) { [0]=> string(10) " string 1 " [1]=> string(8) "string 2" [2]=> string(11) "string 3 " } ["flags":"ArrayIterator":private]=> int(0) } } string(8) "string 2" array(3) { [0]=> string(11) "string 3 " [1]=> int(2) [2]=> object(ArrayIterator)#2 (2) { ["storage":"ArrayIterator":private]=> array(3) { [0]=> string(10) " string 1 " [1]=> string(8) "string 2" [2]=> string(11) "string 3 " } ["flags":"ArrayIterator":private]=> int(0) } } string(11) "string 3 "
Output for 5.0.0 - 5.3.29
Fatal error: Class 'CallbackFilterIterator' not found in /in/1CVNr on line 24
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/1CVNr on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/1CVNr on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/1CVNr on line 2
Process exited with code 255.