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  Classes of Michele Castellucci  >  DBNavigator  >  verimage.php  >  Download  
File: verimage.php
Role: Auxiliary script
Content type: text/plain
Description: Generate a CAPTCHA image
Class: DBNavigator
Browse and edit data stored in a MySQL database
Author: By
Last change:
Date: 7 years ago
Size: 1,231 bytes
 

Contents

Class file image Download
<?php

$width
=80;
$height=20;
$lines=8;

/* Dichiara che lo stream trasmesso รจ un file immagine PNG */
header("Content-Type: image/png");

/* Inizializza la sessione */
session_start();

$verify="";
for (
$i=0;$i<6;$i++)
$verify.=$i 2==0?mt_rand(0,9):chr(mt_rand(65,90));
    
$_SESSION['verification_string']=$verify;

$im imagecreate($width,$height);

$white imagecolorallocate($im255255255);
$black imagecolorallocate($im000);
$grey imagecolorallocate($im150150150);

imagefill($im0,0$black);


for (
$i=0;$i<$lines;$i++)
{
    if (
$i 2==0)//pari=linee verticali
    
{
        
        
$x1=mt_rand(0,$width);
        
$y1=0;
        
$x2=$x1;
        
$y2=$height;
    }
    else 
//dispari=linee orizzontali
    
{
        
$x1=0;
        
$y1=mt_rand(0,$height);
        
$x2=$width;
        
$y2=$y1;
    }
    
imageline($im$x1$y1$x2$y2$grey);
}


/* seleziona un font a caso tra quelli di sistema */
$font=mt_rand(3,5);

$w=strlen($verify)*imagefontwidth($font);
$h=imagefontheight($font);

$x=mt_rand(1,($width-$w-1));
$y=mt_rand(1,($height-$h-1));
imagestring($im$font$x$y$verify$white);



/* output al browser*/
imagepng($im);

/* Distruggo l'immagine in memoria */
imagedestroy($im);

?>