Convert hex color to RGB values in PHP

使用PHP将十六进制颜色值（如#ffffff转换为单个RGB值255 255 255是一种好方法？

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Check out PHP's hexdec() and dechex() functions: http://php.net/manual/en/function.hexdec.php

Example:

$value = hexdec('ff'); // $value = 255

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If you want to convert hex to rgb you can use sscanf :

<?php
$hex = "#ff9900";
list($r, $g, $b) = sscanf($hex, "#%02x%02x%02x");
echo "$hex -> $r $g $b";
?>

Output:

#ff9900 -> 255 153 0

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I made a function which also returns alpha if alpha is provided as a second parameter the code is below.

The function

function hexToRgb($hex, $alpha = false) {
   $hex      = str_replace('#', '', $hex);
   $length   = strlen($hex);
   $rgb['r'] = hexdec($length == 6 ? substr($hex, 0, 2) : ($length == 3 ? str_repeat(substr($hex, 0, 1), 2) : 0));
   $rgb['g'] = hexdec($length == 6 ? substr($hex, 2, 2) : ($length == 3 ? str_repeat(substr($hex, 1, 1), 2) : 0));
   $rgb['b'] = hexdec($length == 6 ? substr($hex, 4, 2) : ($length == 3 ? str_repeat(substr($hex, 2, 1), 2) : 0));
   if ( $alpha ) {
      $rgb['a'] = $alpha;
   }
   return $rgb;
}

Example of function responses

print_r(hexToRgb('#19b698'));
Array (
   [r] => 25
   [g] => 182
   [b] => 152
)

print_r(hexToRgb('19b698'));
Array (
   [r] => 25
   [g] => 182
   [b] => 152
)

print_r(hexToRgb('#19b698', 1));
Array (
   [r] => 25
   [g] => 182
   [b] => 152
   [a] => 1
)

print_r(hexToRgb('#fff'));
Array (
   [r] => 255
   [g] => 255
   [b] => 255
)

If you'd like to return the rgb(a) in CSS format just replace the return $rgb; line in the function with return implode(array_keys($rgb)) . '(' . implode(', ', $rgb) . ')'; return implode(array_keys($rgb)) . '(' . implode(', ', $rgb) . ')';

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