3v4l.org

run code in 500+ PHP versions simultaneously
<?php class Foo { public readonly int $bar; public function set(int &$i) { $this->bar = &$i; } } $i = 1; $foo = new Foo(); $foo->set($i); $i = 20; var_dump($foo->bar);
Output for 8.1.30 - 8.1.34, 8.2.21 - 8.2.30, 8.3.5 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Fatal error: Uncaught Error: Cannot indirectly modify readonly property Foo::$bar in /in/qiDTk:10 Stack trace: #0 /in/qiDTk(17): Foo->set(1) #1 {main} thrown in /in/qiDTk on line 10
Process exited with code 255.
Output for 8.1.0 - 8.1.7
int(20)
Output for 8.0.1 - 8.0.14
Parse error: syntax error, unexpected identifier "int", expecting variable in /in/qiDTk on line 6
Process exited with code 255.
Output for 7.4.0 - 7.4.27
Parse error: syntax error, unexpected 'int' (T_STRING), expecting variable (T_VARIABLE) in /in/qiDTk on line 6
Process exited with code 255.
preferences:
66.51 ms | 931 KiB | 4 Q