php中生成随机字符串的函数
介绍一篇关于php中生成随机加密的函数,有需要朋友可以参考一下,是一个自定了的函数不是系统自带的.
php中生成随机字符串的函数实例代码如下:
- function encrypt_str( $TXT, $KEY )
- {
- srand( ( double )microtime( ) * 1000000 );
- $ENCRYPT_KEY = md5( rand( 0, 32000 ) );
- $CTR = 0;
- $TMP = "";
- $I = 0;
- for ( ; $I < strlen( $TXT ); ++$I )
- {
- if ( $CTR == strlen( $ENCRYPT_KEY ) )
- {
- $CTR = 0;
- }
- $TMP .= substr( $ENCRYPT_KEY, $CTR, 1 ).( substr( $TXT, $I, 1 ) ^ substr( $ENCRYPT_KEY, $CTR, 1 ) );
- ++$CTR;
- }
- return keyed_str( $TMP, $KEY );
- }
- function decrypt_str( $TXT, $KEY )
- {
- $TXT = keyed_str( $TXT, $KEY );
- $TMP = "";
- $I = 0;
- for ( ; $I < strlen( $TXT ); ++$I )
- {
- $MD5 = substr( $TXT, $I, 1 );
- ++$I;
- $TMP .= substr( $TXT, $I, 1 ) ^ $MD5;
- }
- return $TMP;
- }
- function keyed_str( $TXT, $ENCRYPT_KEY )
- {
- $ENCRYPT_KEY = md5( $ENCRYPT_KEY );
- $CTR = 0;
- $TMP = "";
- $I = 0;
- for ( ; $I < strlen( $TXT ); ++$I )
- {
- if ( $CTR == strlen( $ENCRYPT_KEY ) )
- {
- $CTR = 0;
- }
- $TMP .= substr( $TXT, $I, 1 ) ^ substr( $ENCRYPT_KEY, $CTR, 1 ); //开源代码phpfensi.com
- ++$CTR;
- }
- return $TMP;
- }