3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo '<PRE>'; $code = '<?php echo PHP_OS; ?>'; foreach(token_get_all($code) as $c){ if(is_array($c)){ print(token_name($c[0]).": ".htmlentities($c[1])."<br>\n"); } else { print("$c<br>\n"); } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<PRE>T_OPEN_TAG: &lt;?php <br> T_ECHO: echo<br> T_WHITESPACE: <br> T_STRING: PHP_OS<br> ;<br> T_WHITESPACE: <br> T_CLOSE_TAG: ?&gt;<br>
preferences:
188.84 ms | 406 KiB | 313 Q