3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var1=time(); $var2=&$var1; $var2='test'; var_dump($var1);
Output for 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.24, 7.3.0 - 7.3.12
string(4) "test"
preferences:
114.16 ms | 402 KiB | 112 Q