生成32位随机数

使用token的方式，可以控制用户在这个时间内的权限，代码如下：

 

function genToken( $len = 32, $md5 = true ) { # Seed random number generator # Only needed for PHP versions prior to 4.2 mt_srand( (double)microtime()*1000000 ); # Array of characters, adjust as desired $chars = array( 'Q', '@', '8', 'y', '%', '^', '5', 'Z', '(', 'G', '_', 'O', '`', 'S', '-', 'N', '<', 'D', '{', '}', '[', ']', 'h', ';', 'W', '.', '/', '|', ':', '1', 'E', 'L', '4', '&', '6', '7', '#', '9', 'a', 'A', 'b', 'B', '~', 'C', 'd', '>', 'e', '2', 'f', 'P', 'g', ')', '?', 'H', 'i', 'X', 'U', 'J', 'k', 'r', 'l', '3', 't', 'M', 'n', '=', 'o', '+', 'p', 'F', 'q', '!', 'K', 'R', 's', 'c', 'm', 'T', 'v', 'j', 'u', 'V', 'w', ',', 'x', 'I', '$', 'Y', 'z', '*' ); # Array indice friendly number of chars; $numChars = count($chars) - 1; $token = ''; # Create random token at the specified length for ( $i=0; $i<$len; $i++ ) $token .= $chars[ mt_rand(0, $numChars) ]; # Should token be run through md5? if ( $md5 ) { # Number of 32 char chunks $chunks = ceil( strlen($token) / 32 ); $md5token = ''; # Run each chunk through md5 for ( $i=1; $i<=$chunks; $i++ ) $md5token .= md5( substr($token, $i * 32 - 32, 32) ); # Trim the token $token = substr($md5token, 0, $len); } return $token; }

 

然后可以使用echo genToken()查看生成的32位随机数;