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<?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); $c = base_convert((round(min(max(0, floatval($c . ($c * $lum))),255))), 10, 16); $rgb .= substr('00' . $c, strlen($c)); } 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 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: Unsupported operand types: int + string in /in/ETdsb:8 Stack trace: #0 /in/ETdsb(22): ColorLuminance('69c', 0) #1 {main} thrown in /in/ETdsb on line 8
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: A non-numeric value encountered in /in/ETdsb on line 8 Warning: A non-numeric value encountered in /in/ETdsb on line 8 #ff0000 #ffffff Warning: A non-numeric value encountered in /in/ETdsb on line 8 Warning: A non-numeric value encountered in /in/ETdsb on line 8 #300000 #000000
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 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
#ff0000 #ffffff #300000 #000000
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/ETdsb on line 25
Process exited with code 255.
preferences:
225.19 ms | 401 KiB | 314 Q