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run code in 150+ php & hhvm versions
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<?php $white = hexdec('#ffffff'); //Loops for a bunch of colours for( $i = 0 ; $i <= $white ; $i=$i+5000 ) { //set default css background-color property $backgroundValue = dechex( $i ); //if there are less of 7 characters (ex. #fa444, or #32F, ...) if( $numLen = strlen( dechex( $i )) < 7 ) { //insert (7 - numbers of characters) number of zeros after # for ( $j = 0 ; $j < 7 - $numLen ; $j++ ) $backgroundValue = strtr( $backgroundValue, '#', '#0'); } //echo each div with each background-color property. echo '<div class="colour" style="width: 10%; float: left; background: #'.$backgroundValue.';">'.dechex($i).'</div>'; }

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