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    <p>There might be libs to do that. However let's get a short warm up into the general principles. In general you have following options:</p> <ol> <li>A predefined color index, e.g. <code>$coloridx=array(0=&gt;'#FFFFFF',1=&gt;'#FFEE00',...);</code></li> <li>Any algorithm, e.g. linear gradient, which is basically an iterations based adaption of all three RGB channels (R = red, G = green, B = blue).</li> <li>A combination of both, which usually puts the result of any complex algorithm to the color index and then goes from there.</li> </ol> <p>If you include algorithms in your considerations you must understand that there is no <code>true</code> or <code>false</code>. It all depends on what you would like to implement. There might be occasions where it makes sense to render variations of green into <code>n=0..10</code> and then have red to black in everything beyond <code>n&gt;10</code>. Caps and multipliers help to set accents. Things like that.</p> <p>One way of implementing a linear gradient would be:</p> <pre><code>function lineargradient($ra,$ga,$ba,$rz,$gz,$bz,$iterationnr) { $colorindex = array(); for($iterationc=1; $iterationc&lt;=$iterationnr; $iterationc++) { $iterationdiff = $iterationnr-$iterationc; $colorindex[] = '#'. dechex(intval((($ra*$iterationc)+($rz*$iterationdiff))/$iterationnr)). dechex(intval((($ga*$iterationc)+($gz*$iterationdiff))/$iterationnr)). dechex(intval((($ba*$iterationc)+($bz*$iterationdiff))/$iterationnr)); } return $colorindex; } $colorindex = lineargradient( 100, 0, 0, // rgb of the start color 0, 255, 255, // rgb of the end color 256 // number of colors in your linear gradient ); $color = $colorindex[$value]; </code></pre> <p>I UPDATED the code to add dechex, which feeds back on the comments.</p>
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    1. COYour function returns values in the form `#{num1}{num1}{num1}`, where the numX parts are _decimal_ integer values – which makes them not directly usable as CSS colors (which I assume you tried to achieve by prefixing them with `#`). But that’s easily fixed, if you use sprintf with `%02x` to format the values, so maybe you want to adapt your code in that regard. Apart from that, good answer! +1
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