CODEWITHSUNDEEP
phpcaptcha
Harsha
Harsha

Reputation: 3578

Error when showing captcha in PHP

I have following php script for showing the captcha in a web page, captcha is showing properly in my local apache server but when I uploaded in to the web hosting server I get an error as mentioned below, please help 

<?php
session_start();

$str = "";
$length = 0;
for ($i = 0; $i < 6; $i++) {
    // these numbers represent ASCII table (small letters)
    $str .= chr(rand(97, 122));
}

//md5 letters and saving them to session
$letters = md5($str);
$_SESSION['letters'] = $letters;

//determine width and height for our image and create it
$imgW = 150;
$imgH = 50;
$image = imagecreatetruecolor($imgW, $imgH);

//setup background color and border color
$backgr_col = imagecolorallocate($image, 238,239,239);
$border_col = imagecolorallocate($image, 208,208,208);

//let's choose color in range of purple color
$text_col = imagecolorallocate($image, rand(70,90),rand(50,70),rand(120,140));

//now fill rectangle and draw border
imagefilledrectangle($image, 0, 0, $imgW, $imgH, $backgr_col);
imagerectangle($image, 0, 0, $imgW-1, $imgH-1, $border_col);

//save fonts in same folder where you PHP captcha script is
//name these fonts by numbers from 1 to 3
//we shall choose different font each time
$fn = rand(1,3);
$font = $fn . ".ttf";

//setup captcha letter size and angle of captcha letters
$font_size = $imgH / 2.0;
$angle = rand(-15,15);
$box = imagettfbbox($font_size, $angle, $font, $str);
$x = (int)($imgW - $box[4]) / 2;
$y = (int)($imgH - $box[5]) / 2;
imagettftext($image, $font_size, $angle, $x, $y, $text_col, $font, $str);

//now we should output captcha image
header("Content-type: image/png");
imagepng($image);
imagedestroy ($image);
?>

And the error is

Error: Image corrupt or truncated: http://url/captcha.php
Source File: http://url/captcha.php

Upvotes: 0

Views: 1673

Answers (1)

Martin Kontsek
Martin Kontsek

Reputation: 81

I had a problem, that using CAPTCHA (with imagepng()) worked on one machine, but not on the remote server. I checked the PNG file in a hex editor and found an extra 0D0A in the first 4 bytes. I called ob_clean() right before imagepng(), problem solved.

Upvotes: 5

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