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<?php trait tSB_FormFieldObject { } interface iSB_FormFieldObject { } class SB_FormFieldObject implements iSB_FormFieldObject { use tSB_FormFieldObject; public $Test2 = "aa"; } function test($a=null) { echo "trait: " .($a instanceof tSB_FormFieldObject) . PHP_EOL; echo "interface: " .($a instanceof iSB_FormFieldObject) . PHP_EOL; echo "using: " .(is_using($a, "tSB_FormFieldffObject")) . PHP_EOL; echo "instanceof: " .(is_instance_of($a, "tSB_FormFieldffObject")) . PHP_EOL; } function is_using($class, $trait) { return in_array($trait, (new ReflectionClass($class))->getTraitNames()); } function is_instance_of($sub, $super) { $sub = (string)$sub; $super = is_object($super) ? get_class($super) : (string)$super; switch(true) { case $sub === $super; // well ... conformity case is_subclass_of($sub, $super): case in_array($super, class_implements($sub)): return true; default: return false; } } $a = new SB_FormFieldObject(); test($a); ?>
Output for 7.1.0
trait: interface: 1 using: Recoverable fatal error: Object of class SB_FormFieldObject could not be converted to string in /in/0peKX on line 21
Process exited with code 255.
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.14
trait: interface: 1 using: Catchable fatal error: Object of class SB_FormFieldObject could not be converted to string in /in/0peKX on line 21
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/0peKX on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/0peKX on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0peKX on line 2
Process exited with code 255.