<?php function generateHexKey($startColor = '000', $range = 3) { $length = strlen($startColor); $range = (filter_var($range, FILTER_SANITIZE_NUMBER_INT) != '') ? filter_var($range, FILTER_SANITIZE_NUMBER_INT) : 3; $i = 0; $key = ''; for($j=$length; $j<6; $j++) { $key .= ($startColor{$i}+$range); $range = (($range-1) != 0) ? ($range-1) : ($range+1); } return $startColor . $key; } echo generateHexKey();
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