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run code in 300+ PHP versions simultaneously
<?php class a{ public $res = 1; public function abc( int $d){ for ($x=1; $x<$d; $x++) $this->res = $this->res * $this->abc( $x); return $this->res; } } $a = new a(); echo $a->abc(10);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
1
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Catchable fatal error: Argument 1 passed to a::abc() must be an instance of int, integer given, called in /in/rsXY7 on line 13 and defined in /in/rsXY7 on line 5
Process exited with code 255.

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