3v4l.org

run code in 300+ PHP versions simultaneously
<?php $color = array('white', 'green', 'red'); foreach ($color as $c) { echo "$c, "; } sort($color); echo "<ul>"; foreach ($color as $y) { echo "_$y_"; } echo "</ul>"; ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
white, green, red, <ul> Warning: Undefined variable $y_ in /in/XQT5B on line 11 _ Warning: Undefined variable $y_ in /in/XQT5B on line 11 _ Warning: Undefined variable $y_ in /in/XQT5B on line 11 _</ul>
Output for 5.0.4 - 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 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
white, green, red, <ul> Notice: Undefined variable: y_ in /in/XQT5B on line 11 _ Notice: Undefined variable: y_ in /in/XQT5B on line 11 _ Notice: Undefined variable: y_ in /in/XQT5B on line 11 _</ul>
Output for 7.3.32 - 7.3.33
white, green, red, <ul>___</ul>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
white, green, red, <ul> Notice: Undefined variable: y_ in /in/XQT5B on line 11 _ Notice: Undefined variable: y_ in /in/XQT5B on line 11 _ Notice: Undefined variable: y_ in /in/XQT5B on line 11 _</ul>

preferences:
215.52 ms | 402 KiB | 355 Q