Preview:
$colorRange = array('red', 'blue', 'green');
shuffle($colorRange);

//usage example
echo "<p style='font-size:3em;' class='$colorRange[0]'>hello world!</p>";

//classes (red, blue, green) defined in companion stylesheet
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Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter