PHP实现生成任意长度字符串
PHP实现生成任意长度字符串,可定制长度、字母、数字、大小写。具体代码如下:
<?/** 生成随机字符串的类,默认只包含数字、大小写字母* @author Jerry <maolyc@gmail.com>*/class randomString {/** 生成的字符串包含的字符设置*/const NUMERIC_ONLY = 1; //只含有数字const LETTER_ONLY = 2; //只含有字母const MIXED = 3; //混合数字和字母/** 用户传入变量,分别为字符串长度;包含的字母;是否包含大写字母*/protected $length, $type, $upper;/** 参数初始化* @param int,$length 字符串长度* @param const,$type 生成字符串的类型* @param boolean,$upper 是否含有大写字母*/public function __construct($length = 16, $type = self::MIXED, $upper = true) {$this->length = $length;$this->type = $type;$this->upper = $upper;}/** 对象被转化为字符串时调用* @return string*/public function __toString() {return $this->pickUpChars();}/** 生成随机字符串* @global $type* @return string,$string*/public function pickUpChars() {switch ($this->type) {case self::NUMERIC_ONLY:$raw = '0123456789';break;case self::LETTER_ONLY:$raw = 'qwertyuioplkjhgfdsazxcvbnm' .'QWERTYUIOPLKJHGFDSAZXCVBNM';break;default:$raw = 'qwertyuioplkjhgfdsazxcvbnm' .'QWERTYUIOPLKJHGFDSAZXCVBNM' .'0123456789';break;}$string = '';for ($index = 0; $index < $this->length; $index++)$string .= substr($raw, mt_rand(0, strlen($raw) - 1), 1);if (!$this->upper)$string = strtolower($string);return $string;}}//echo new randomString(170, randomString::MIXED, TRUE).'<br/>'; 转载请注明来源论文发表http://www.400qikan.com