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run code in 150+ php & hhvm versions
Bugs & Features
<?php class String { public function __construct($s) { $this->payload = str_split($s); } public function __toString() { return implode($this->payload,''); } } class BetterString { private $content; public function __construct($string) { $this->content = $string; } public function __toString() { return $this->content; } } function foo(String $a, BetterString $b) { echo $a === $b ? 'Same shit' : 'Not same shit'; } foo(new String('bar hello foo 12312312b !")#(Y€#"#€#'));
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.4.30
Catchable fatal error: Argument 2 passed to foo() must be an instance of BetterString, none given, called in /in/bRLDt on line 33 and defined in /in/bRLDt on line 28
Process exited with code 255.
Output for 5.1.0 - 5.1.6
Fatal error: Argument 2 passed to foo() must be an object of class BetterString, called in /in/bRLDt on line 33 and defined in /in/bRLDt on line 28
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Fatal error: Argument 2 must be an object of class BetterString in /in/bRLDt on line 28
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/bRLDt on line 4
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/bRLDt on line 4
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/bRLDt on line 4
Process exited with code 255.