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run code in 150+ php & hhvm versions
Bugs & Features
<?php trait Singleton { public static function getInstance(){ static $counter = 0; static $instance = null; if (!isset($instance)) { $instance = new static(); } $counter++; echo "$counter\n"; return $instance; } } abstract class Abudabia { use Singleton; } class a1 extends Abudabia { public function set() { return 'allah ahbar'; } } class a2 extends Abudabia { public function get() { return 'algazira'; } } $a = a1::getInstance(); $b = a2::getInstance(); $a = a1::getInstance(); $b = a2::getInstance(); $a = a1::getInstance(); $b = a2::getInstance(); var_dump($a,$b);
based on Yd517
Output for 5.4.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
1 1 2 2 3 3 object(a1)#1 (0) { } object(a2)#2 (0) { }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/JYXfU on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/JYXfU on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/JYXfU on line 2
Process exited with code 255.