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Core_Text::random

Generates a random string of a given type and length.

$str = Text::random(); // 8 character random string

The following types are supported:

alnum: Upper and lower case a-z, 0-9 (default)
alpha: Upper and lower case a-z
hexdec: Hexadecimal characters a-f, 0-9
distinct: Uppercase characters and numbers that cannot be confused

You can also create a custom type by providing the "pool" of characters as the type.

string Core_Text::random( [ string $type = null , integer $length = integer 8 ] )

uses: UTF8::split

参数列表

参数类型描述默认值

$type string A type of pool, or a string of characters to use as the pool null

$length integer Length of string to return integer 8

参数	类型	描述	默认值
`$type`	`string`	A type of pool, or a string of characters to use as the pool	null
`$length`	`integer`	Length of string to return	integer 8

返回值

string

File: ./core/classes/text.class.php

public static function random($type = NULL, $length = 8)
{
    if (null===$type)
    {
        // Default is to generate an alphanumeric string
        $type = 'alnum';
    }

    $utf8 = FALSE;

    switch ( $type )
    {
        case 'alnum' :
            $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
            break;
        case 'alpha' :
            $pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
            break;
        case 'hexdec' :
            $pool = '0123456789abcdef';
            break;
        case 'numeric' :
            $pool = '0123456789';
            break;
        case 'nozero' :
            $pool = '123456789';
            break;
        case 'distinct' :
            $pool = '2345679ACDEFHJKLMNPRSTUVWXYZ';
            break;
        default :
            $pool = (string)$type;
            $utf8 = !UTF8::is_ascii($pool);
            break;
    }

    // Split the pool into an array of characters
    $pool = ($utf8 === true) ? UTF8::str_split($pool, 1) : str_split($pool, 1);

    // Largest pool key
    $max = count($pool) - 1;

    $str = '';
    for($i = 0; $i < $length; $i++)
    {
        // Select a random character from the pool and add it to the string
        $str .= $pool[mt_rand(0, $max)];
    }

    // Make sure alnum strings contain at least one letter and one digit
    if ($type === 'alnum' && $length > 1)
    {
        if (ctype_alpha($str))
        {
            // Add a random digit
            $str[mt_rand(0, $length - 1)] = chr(mt_rand(48, 57));
        }
        elseif ( ctype_digit($str) )
        {
            // Add a random letter
            $str[mt_rand(0, $length - 1)] = chr(mt_rand(65, 90));
        }
    }

    return $str;
}