3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function ColorLuminance($hex, $lum) { // validate hex string $hex = preg_replace("/[^0-9a-f]/i", "", $hex); if (strlen($hex) < 6) { $hex = $hex[0] + $hex[0] + $hex[1] + $hex[1] + $hex[2] + $hex[2]; } // convert to decimal and change luminosity $rgb = "#"; for ($i = 0; $i < 3; $i++) { $c = base_convert(substr($hex, $i * 2, 2), 16, 10); echo $c . " - "; $c = base_convert((round(min(max(0, floatval($c + ($c * $lum))),255))), 10, 16); echo $c . " - "; $rgb .= substr('00' + $c, strlen($c)); echo $rgb . " - "; } return $rgb; } echo ColorLuminance("#69c", 0) . "\n"; // returns "#6699cc" /*echo ColorLuminance("6699CC", 0.2) . "\n";// "#7ab8f5" - 20% lighter echo ColorLuminance("69C", -0.5) . "\n";// "#334d66" - 50% darker echo ColorLuminance("000", 1) . "\n";// "#000000" - true black cannot be made lighter!*/
Output for 7.1.0
Warning: A non-numeric value encountered in /in/jVenI on line 8 Warning: A non-numeric value encountered in /in/jVenI on line 8 48 - 30 - # - 0 - 0 - # - 0 - 0 - # - #
Output for 4.3.0 - 5.6.26, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.0.14
48 - 30 - # - 0 - 0 - # - 0 - 0 - # - #