生成随机密码函数

两个产生随机密码函数：
函数一：

function  randomPassword( $passwordLength   =   8 )
{
     $str   =   " abcefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ " ;
     if ( $passwordLength   >   strlen ( $str ))
         $passwordLength   =   strlen ( $str );
     if ( $passwordLength   <   8 )
         $passwordLength   =   8 ;
     $start   =   mt_rand ( 1 ,  ( strlen ( $str )  -   $passwordLength ));
     $string   =   str_shuffle ( $str );
     $password   =   substr ( $string ,   $start ,   $passwordLength );
     return ( $password );
}

函数二：

function  randomPassword( $passwordLength = 8 )
{
     // 密码字符串
     define ( " PASS_STRING " , " ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 " );    
       
     if ( $passwordLength   <   8 )
         $passwordLength   =   8 ;
     for ( $i   =   1 ;  $i   <=   $passwordLength ;  $i ++ )
    {
         $randomPosition   =   rand ( 0 ,   strlen (PASS_STRING) - 1 );
         $password   .=   substr (PASS_STRING ,   $randomPosition ,   1 );
    }
     return   $password ;
}