3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $width = $height = 1024; $stepSize = 10; for ($x=0; $x < width; $x+=$stepSize) { for ($y=0; $y < height; $y+=$stepSize) { echo "Checking pixel at ($x, $y)"; } }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant width - assumed 'width' in /in/rKgAj on line 5