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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) { $value &= $this->filter($value); } } $array = array( ' string 1 ', 'string 2', 'string 3 ', ); foreach (new CallbackFilterIterator(new ArrayIterator($array), new StringTrimFilter()) as $value) { var_dump($value); }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: StringTrimFilter::__invoke(): Argument #1 ($value) must be passed by reference, value given in /in/2DK7F on line 23 Warning: StringTrimFilter::__invoke(): Argument #1 ($value) must be passed by reference, value given in /in/2DK7F on line 23 Warning: StringTrimFilter::__invoke(): Argument #1 ($value) must be passed by reference, value given in /in/2DK7F on line 23
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Fatal error: Class 'CallbackFilterIterator' not found in /in/2DK7F on line 23
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/2DK7F on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/2DK7F on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/2DK7F on line 2
Process exited with code 255.
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