3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { protected $testVal = session_id(); public function __construct() { echo "hello!"; } } $a = new A();
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.24
Parse error: syntax error, unexpected '(', expecting ',' or ';' in /in/RaETP on line 5
Process exited with code 255.

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