php生成短域名函数

php生成短域名函数

public function createRandCode($string) {
 $code = '';
 $hex_code = '1qaz2wsx3edc4rfv5t-gb6yhn7ujm8ik9ol0p_';
 $now = microtime(true) * 10000;
 $strlen = strlen($hex_code);
 
 $hash_code = hash('sha256', $string);
 
 // 这里会为编码定义一个随机的长度，长度取决于step
 $step = rand(8, 16);
 $count = ceil(strlen($hash_code) / $step);
 
 for($i = 0; $i < $count; $i++) {
 $start = $i * $step;
 $hex_num = substr($hash_code, $start, $step);
 $num = 0x3fffffff & (1 * '0x' . $hex_num);
 $n = $num % $strlen;
 $code .= $hex_code[$n];
 }
 
 return $code;
 }

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