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run code in 500+ PHP versions simultaneously
<?php class A { static protected $count = 0; protected $data = [1,2,3,5]; public function data() { return $this->data; } } class B extends A { protected $data = [5,6,7,89]; public function data() { self::$count++; echo self::$count, "\n"; if (self::$count >= 10) return; return static::data(); } } $b = new B(); var_dump($b->data());
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
1 2 3 4 5 6 7 8 9 10 NULL

preferences:
35.41 ms | 1137 KiB | 7 Q