PHP: Función Genera Passw Palabras Legibles - (GD) Sessiones

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Código PHP:

<?php
function FUNC_generaPassw($num,$may){
    if(empty($num)){$num=5;}
 
    $voc = array ("a","e","i","o","u");
    $con = array ("b","c","d","f","g","h","j","k","l","m","n","ñ","p","q","r","s","t","w","x","y","z");
    $psw = "";
    $vc  = mt_rand(0,1);
 
        for ($n=0; $n<$num; $n++){
            if ($vc==1){
                $vc=0;
                $psw .= $con[mt_rand(0,count($con)-1)];
            }
            $psw .= $voc[mt_rand(0,count($voc)-1)];
            $psw .= $con[mt_rand(0,count($con)-1)];
        }
 
    $psw = ereg_replace ("q","qu",$psw);
    $psw = ereg_replace ("quu","que",$psw);
    $psw = ereg_replace ("yi","ya",$psw);
    $psw = ereg_replace ("iy","ay",$psw);
 
        if(empty($may)){
            $psw = strtoupper($psw);
        }
 
    $psw = substr($psw,0,$num);
 
    session_name('codePaswSession');
    session_start();
    session_cache_limiter('nocache,private');
    ini_set("session.cache_limiter","6400");
 
    if(empty($_SESSION['psw'])){
        $_SESSION['psw'] = $psw;
    }else{
        $psw = $_SESSION['psw'];
    }
 
    return $psw;
}
 
function FUNC_imprimePasswImg($psw,$fontSize,$winSizeW,$winSizeH) {
    if(empty($psw)){$psw = "ERROR PASSW";}
    if(empty($fontSize)){$fontSize=5;}
    if(empty($winSizeW)){$winSizeW=72;}
    if(empty($winSizeH)){$winSizeH=18;}
 
    $width  = ImageFontWidth($fontSize) * strlen($string);
    $height = ImageFontHeight($fontSize);
    $img = ImageCreate($winSizeW,$winSizeH);
    $bgColor = ImageColorAllocate($img,102,102,202);
    $txColor = ImageColorAllocate($img,220,220,220);
    ImageFilledRectangle($img,0,0,$winSizeW,$winSizeH,$bgColor);
    ImageString($img,$fontSize,0,0,$psw,$txColor);
 
    header("content-type: image/png");
    ImagePng($img);
    Imagedestroy($img);
 
}
 
FUNC_imprimePasswImg(FUNC_generaPassw(8,1),5,72,18);
 
/*
1º= numero de letras = 8
2º= minusculas = 1 o mayusculas = 0
3º= size-text = 5
4º= sizeW-win = 72
5º= sizeH-win = 18
 
Para usarlo, crea un fichero xxx.html o xxx.php y le pones esto
1º= Si es HTML solo:
    <img src="func_codeletras.inc.php">
 
2º= Si ademas de HTML, quieres usar php:
     <img src="func_codeletras.inc.php">
    session_name('codePaswSession');
    session_start();
    session_cache_limiter('nocache,private');
    ini_set("session.cache_limiter","6400");
 
    echo $_SESSION['psw'];
 
*/
?> 

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--Nuevo 31 Mar 2004