The following PHP function will return an inverse HEX color with PHP. It's handy if you need to print readable text on a colored background. It's not always aesthetically pleasing so it's usually best to use a black, neutral, or white text overlay on a background based on the background color's numeric value.
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<?php
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/*
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Return an Inverse Color With PHP
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http://www.beliefmedia.com/code/php-snippets/inverse-color-php
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*/
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function beliefmedia_inverse_color($color) {
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if (strlen($color) != 6) $color = str_repeat(substr($color, 0, 1), 2) . str_repeat(substr($color, 1, 1), 2) . str_repeat(substr($color, 2, 1), 2);
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for ($x = 0; $x < 3; $x++) {
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}
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return '#' . $hex;
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}
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/* Usage (returns #000000) */
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echo beliefmedia_inverse_color($color = 'ffffff');
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/* Usage (returns #00ffff) */
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echo beliefmedia_inverse_color($color = 'ff0000');
Other color functions can be found on our blog by way of the color 
tag.
