function.random_string.php

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<?php
 
// include secure.php to protect this file and the whole CMS!
if(!defined("SEC_FILE")){define("SEC_FILE",'/framework/secure.php' );}
if (defined('LEPTON_PATH')) {   
    include LEPTON_PATH.SEC_FILE;
} else {
    $oneback = "../";
    $root = $oneback;
    $level = 1;
    while (($level < 10) && (!file_exists($root.SEC_FILE))) {
        $root .= $oneback;
        $level += 1;
    }
    if (file_exists($root.SEC_FILE)) { 
        include $root.SEC_FILE;  
    } else {
        trigger_error(sprintf("[ <b>%s</b> ] Can't include secure.php!", $_SERVER['SCRIPT_NAME']), E_USER_ERROR);
    }
}
// end include secure file
 
 
function random_string(int $iNumOfChars = 8, string $aType="alphanum"): string
{
    switch(strtolower($aType))
    {
        case 'alphanum':
            $salt = 'abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
            break;
 
        case 'alpha':
        case 'chars':
            $salt = 'abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
            break;
 
        case 'hex':
            $salt = 'ABCDEF0123456789';
            break;
 
        case 'hex-lower':
            $salt = 'abcdef0123456789';
            break;
 
        case 'lower':
            $salt = 'abcefghijklmnopqrstuvwxyz';
            break;
 
        case 'num':
            $salt = '1234567890';
            break;
 
        case 'pass':
            $salt = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-.";
            break;
 
        default:
            $salt = (is_array($aType)) ? implode("", $aType) : (string) $aType ;
            break;
    }
 
    $max = strlen($salt);
    if ($iNumOfChars > $max)
    {
        do
        {
            $salt .= $salt;
        } while (strlen($salt) < $iNumOfChars);
    }
 
    return substr(str_shuffle($salt), 0, $iNumOfChars);
}