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run code in 300+ PHP versions simultaneously
<?php class Foo implements JsonSerializable { private $thing; public function __construct($thing) { $this->thing = $thing; } public function jsonSerialize() { return [ 'thing' => $this->thing, ]; } } $foo = new Foo('Foo Bar'); echo json_encode(['the_foo' => $foo]);
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
Deprecated: Return type of Foo::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/c9UeF on line 12 {"the_foo":{"thing":"Foo Bar"}}
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
{"the_foo":{"thing":"Foo Bar"}}
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146.32 ms | 408 KiB | 5 Q