3v4l.org

run code in 300+ PHP versions simultaneously
<?php $f = tmpfile(); fwrite($f, 'content here'); fseek($f, 0); echo fread($f, 1024);
based on mBhLk
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.21, 7.4.0 - 7.4.9, 8.0.0alpha1 - beta1
content here