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run code in 150+ php & hhvm versions
Bugs & Features
<?php class MyArrayIter implements Iterator { private $storage; public function __construct(array $a) { $storage = $a; } public function current() { return current($this->storage); } public function key() { return key($this->storage); } public function next() { next($this->storage); } public function rewind() { reset($this->storage); } public function valid() { return key($this->storage) !== null; } } $i = 1; $a = [1,2,$i,4,5]; $iter = new MyArrayIter($a); foreach($iter as &$v) { $v = 1; } var_dump($a); var_dump($iter);
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: An iterator cannot be used with foreach by reference in /in/f35C1:28 Stack trace: #0 {main} thrown in /in/f35C1 on line 28
Process exited with code 255.
Output for hhvm-3.10.0 - 3.12.0
Fatal error: An iterator cannot be used with foreach by reference in /in/f35C1 on line 30
Process exited with code 255.
Output for 5.4.0 - 5.6.28
Fatal error: An iterator cannot be used with foreach by reference in /in/f35C1 on line 28
Process exited with code 255.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/f35C1 on line 25
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/f35C1 on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/f35C1 on line 3
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, expecting '{' in /in/f35C1 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/f35C1 on line 3
Process exited with code 255.