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run code in 150+ php & hhvm versions
Bugs & Features
<?php class string { private $holder = null; public function __construct($x) { $this->holder = (string)$x; } public function __toString() { return $this->holder; } public function __call($name, $args) { return call_user_func_array($name, array_merge([$this->holder], $args)); } } var_dump((new string('foo'))->strlen(), strlen(new string('bar')));
Output for 5.4.0 - 5.6.28, hhvm-3.12.0
int(3) int(3)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.3.28
Parse error: syntax error, unexpected '[', expecting ')' in /in/iHXF8 on line 19
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/iHXF8 on line 19
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/iHXF8 on line 5
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 T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/iHXF8 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/iHXF8 on line 5
Process exited with code 255.