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, $y)"; } }
Output for 5.4.0 - 5.4.26
Parse error: syntax error, unexpected '0' (T_LNUMBER), expecting variable (T_VARIABLE) or '$' in /in/5MbDX on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_LNUMBER, expecting T_VARIABLE or '$' in /in/5MbDX on line 6
Process exited with code 255.