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<?php class Test implements Serializable { public $data = array(); public function serialize() { return serialize($this->data); } public function unserialize() { } } class Record implements Serializable { public $data = array(); public function __construct() { $object = new StdClass(); $object->property = 'whoa'; $test = new Test(); $test->data = array(1,2,3); $this->data = array( 'array' => array(1,2,3,5), 'object' => $object, 'test' => $test, 'string' => '12345', 'integer' => 123455 ); } public function serialize() { return serialize($this->data); } public function unserialize($serialized) { } } $object = new Record(); var_dump(serialize($object));
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
Fatal error: Declaration of Test::unserialize() must be compatible with Serializable::unserialize(string $data) in /in/FiuB8 on line 11
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Fatal error: Declaration of Test::unserialize() must be compatible with Serializable::unserialize($serialized) in /in/FiuB8 on line 11
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Fatal error: Declaration of Test::unserialize() must be compatible with Serializable::unserialize($serialized) in /in/FiuB8 on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: Declaration of Test::unserialize() must be compatible with Serializable::unserialize($serialized) in /in/FiuB8 on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Fatal error: Declaration of Test::unserialize() must be compatible with that of Serializable::unserialize() in /in/FiuB8 on line 4
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Fatal error: Declaration of Test::unserialize() must be compatible with that of Serializable::unserialize() in /in/FiuB8 on line 3
Process exited with code 255.
Output for 5.0.5
Fatal error: Interface 'Serializable' not found in /in/FiuB8 on line 3
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Fatal error: Class 'Serializable' not found in /in/FiuB8 on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/FiuB8 on line 3
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, expecting '{' in /in/FiuB8 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/FiuB8 on line 3
Process exited with code 255.

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