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Generate a Random Color Value With PHP

Hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols: 0–9 to represent values zero to nine, and case-insensitive A, B, C, D, E, F to represent values ten to fifteen. Since colors are represented by HEX values between 0x000000 and 0xffffff (where 0x simply indicate the number is in hexadecimal), we simply select a random value between the two limits.

The following functions are just examples of how you might generate a random value from white to black. Since 0xffffff translates to a numeric value of 16777215, you can use it as an alternative to the HEX limit (with the former requiring a conversion back to the HEX value).

<?php

http://www.beliefmedia.com/code/php-snippets/random-hex-color-php

function bm_random_hex() {

return '#' . dechex(rand(0x000000, 0xFFFFFF));

}

function bm_random_hex() {

return '#' . str_pad(dechex(rand(0, 16777215)), 6, 0, STR_PAD_LEFT);

}

function bm_random_hex() {

return sprintf('#%06x', rand(0, 16777215));

}

function bm_random_hex() {

$rand = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f');

return '#' . $rand[rand(0,15)] . $rand[rand(0,15)] . $rand[rand(0,15)] . $rand[rand(0,15)] . $rand[rand(0,15)] . $rand[rand(0,15)];

}

/* Usage */

echo bm_random_hex();

Only one function should be used. The last function isn't overly efficient.

If you wanted to generate a random color value with RGB values (for example, rgb(255,255,255)), use the following:

<?php

Generate a Random Color Value With PHP

http://www.beliefmedia.com/code/php-snippets/random-hex-color-php

function bm_random_rgb() {

return 'rgb(' . rand(0, 255) . ',' . rand(0, 255) . ',' . rand(0, 255) . ')';

}

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Generate a Random Color Value With PHP

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Martin Khoury

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