I have created a captcha for my login system. It works and gives me captcha (random) code on the image but if I add HTML code above the captcha code the captcha doesn't work.
<h1> This is my HTML code </h1>
<?php
header("Content-type: image/jpeg");
$imgPath = 'background.jpg';
$image = imagecreatefromjpeg($imgPath);
$color = imagecolorallocate($image, 253, 253, 253);
$string = rand();
$fontSize = 14;
$x = 30;
$y = 15;
imagestring($image, $fontSize, $x, $y, $string, $color);
imagejpeg($image);
?>
How can I execute successfully HTML code in the same capcha.php file?
Related
here is my code, test1.php works, test2.php not works.
test1.php:
<?php
session_start();
header('Content-type: image/jpeg');
$text = rand(1000,9999);
$font_size = 5;
$image_width = imagefontwidth($font_size) * strlen($text);
$image_height = imagefontheight($font_size);
$image = imagecreate($image_width, $image_height);
imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 0, 0, 0);
imagestring($image, $font_size, 0, 0, $text, $text_color);
$_SESSION['image'] = $image;
$image_session = $_SESSION['image'];
imagejpeg($image_session);
?>
test2.php:
<?php
session_start();
header('Content-type: image/jpeg');
$image_session = $_SESSION['image'];
imagejpeg($image_session);
?>
As you can see, test1.php create a random image.
I can use:
<img src="test1.php">
to show the image from test1.php in any pages.
but, I want to use if else statement in other php files.
for example:
if users click submit button and enter nothing(no answer), the image will still the same, they have to answer the same question. if failed, the image will change.
I don't want to use javascript to prevent users input nothing and store images in disk.
so, I think that I need a variable to store the image that can be used again.
but I found I cannot use above method.
how can I achieve this?
imagecreate() returns a resource representing given image. PHP's sessions cannot store resource-type variables (more precisely - PHP is unable to serialize them upon script end), see http://php.net/manual/en/function.session-register.php:
Note: It is currently impossible to register resource variables in a
session. ...
You may serialize the image to a string and store this string to the session (not tested):
test1.php:
...
ob_start();
imagejpeg($image);
$contents = ob_get_contents();
ob_end_clean();
$_SESSION['image'] = $contents;
test2.php:
header('Content-type: image/jpeg');
die($_SESSION['image']);
Without knowing much about the context, can't you do something like
session_start();
$_SESSION['randomValue'] = mt_rand(1000,9999);
if(someValueIsEntered){
$_SESSION['randomValue'] = mt_rand(1000,9999);
}
echo "<img src='test.php?random=".$_SESSION['randomValue']."'/>";
Test.php
$randomValue = filter_input(INPUT_GET, 'random');
header('Content-type: image/jpeg');
$text = $randomValue;
$font_size = 5;
$image_width = imagefontwidth($font_size) * strlen($text);
$image_height = imagefontheight($font_size);
$image = imagecreate($image_width, $image_height);
imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 0, 0, 0);
imagestring($image, $font_size, 0, 0, $text, $text_color);
imagejpeg($image);
Multiple parameters example:
Store the information about the image in an array.
session_start();
if(!isset($_SESSION['imageData']){
$_SESSION['imageData'] = array(
"random" => mt_rand(1000,9999),
"x1" => mt_rand(0,10),
"x2" => mt_rand(0,10)
);
}
if(someValueIsEntered){
//Randomize array again.
}
$imageString = "test.php";
foreach ($_SESSION['imageData'] as $key => $value) {
$index = current($array);
if($index == 0) {
$seperator = "?";
} else {
$seperator = "&";
}
$imageString .= $seperator.$key."=".$value;
}
echo "<img src='".$imageString."'/>";
And just call them in the test.php then.
I got a simple HTML that calls a image generated from a PHP file but the image is not being displayed. The HTML part is:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<img src="imgcaptcha.php"/>
</body>
</html>
imgcaptcha.php is:
<?php
//error_reporting(E_ALL);
//header('Content-Type: image/png');
//Generates rando string
function geraStringAleatoria($length = 10) {
$charSet = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$stringAleatoria = '';
for ($i = 0; $i < $length; $i++) {
$stringAleatoria .= $charSet[rand(0, strlen($charSet) - 1)];
}
return $stringAleatoria;
}
//Generate the captcha image
function geraImagemCaptcha($text = 'good'){
// Set the content-type
$width = 200;
$height = 30;
// Create the image
$im = imagecreatetruecolor($width, $height) or die('display nao instalado');;
// Create some colors
$white = imagecolorallocate($im, 255, 255, 255);
$grey = imagecolorallocate($im, 128, 128, 128);
$black = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, $width-1, $height-1, $white);
//ADD NOISE - DRAW background squares
$square_count = 6;
for($i = 0; $i < $square_count; $i++){
$cx = rand(0,$width);
$cy = (int)rand(0, $width/2);
$h = $cy + (int)rand(0, $height/5);
$w = $cx + (int)rand($width/3, $width);
imagefilledrectangle($im, $cx, $cy, $w, $h, $white);
}
//ADD NOISE - DRAW ELLIPSES
$ellipse_count = 5;
for ($i = 0; $i < $ellipse_count; $i++) {
$cx = (int)rand(-1*($width/2), $width + ($width/2));
$cy = (int)rand(-1*($height/2), $height + ($height/2));
$h = (int)rand($height/2, 2*$height);
$w = (int)rand($width/2, 2*$width);
imageellipse($im, $cx, $cy, $w, $h, $grey);
}
// Replace path by your own font path
$font = 'flushout.ttf';
// Add some shadow to the text
imagettftext($im, 20, 0, 11, 21, $grey, $font, $text);
// Add the text
imagettftext($im, 20, 0, 10, 20, $black, $font, $text);
// Using imagepng() results in clearer text compared with imagejpeg()
imagepng($im);
imagedestroy($im);
}
geraImagemCaptcha(geraStringAleatoria());
?>
I'm using PHP 7
Tried already commenting out header(); call and add error_reporting(E_ALL); but no error message was displayed. Tried also many other different font.ttf files according to this, also didn't worked, so I guess that the problem is in another part of the code rather than the font because I tried many sites and also some other .ttf files I got from other programs installed. The problem is happening in both all browsers I tested. What could be missing in the code? Btw, I got this generate captcha image from here.
I want to add a text to a image. The text should be displayed in multiple areas of the image (not just one).
For example I want to watermark with a text stack. Stack should be displayed in the image at least 8 times in different areas in the image.
I just learned about imagestring() and imagettftext(), but these two only displays my text on a single spot.
Image is not fixed size, so i cannot specify exact and multiple location in advance. It should work on all sizes of images
<?php
/*
image.php
*/
header("Content-type: image/jpeg");
$imgPath = 'olximage.jpg';
$image = imagecreatefromjpeg($imgPath);
$color = imagecolorallocate($image, 255, 255, 255);
$string = "stack overflow";
$fontSize = 3;
$x = 15;
$y = 185;
imagestring($image, $fontSize, $x, $y, $string, $color);
$x = 15;
$y = 175;
imagestring($image, $fontSize, $x, $y, $string, $color);
imagejpeg($image);
?>
Thanks in advance
For example:
<?php
/*
image.php
*/
header("Content-type: image/jpeg");
$imgPath = 'olximage.jpg';
$image = imagecreatefromjpeg($imgPath);
$color = imagecolorallocate($image, 255, 255, 255);
$string = "stack overflow";
$fontSize = 3;
$imageHeight = imagesy($image);
$distanceY = 10;
$maxImageStrings = max(8, $imageHeight / $distanceY);
$x = 15;
for ($i = 0; $i < $maxImageStrings; $i++) {
$y = $i * $distanceY;
imagestring($image, $fontSize, $x, $y, $string, $color);
}
imagejpeg($image);
You can finetune calculations for your needs.
I'm using Imagick extension for same. If you want to go with this then follow detail:
PHP:
// Create objects
$image = new Imagick('image.png');
$watermark = new Imagick();
// Watermark text
$text = 'Copyright';
// Create a new drawing palette
$draw = new ImagickDraw();
$watermark->newImage(140, 80, new ImagickPixel('none'));
// Set font properties
$draw->setFont('Arial');
$draw->setFillColor('grey');
$draw->setFillOpacity(.5);
// Position text at the top left of the watermark
$draw->setGravity(Imagick::GRAVITY_NORTHWEST);
// Draw text on the watermark
$watermark->annotateImage($draw, 10, 10, 0, $text);
// Position text at the bottom right of the watermark
$draw->setGravity(Imagick::GRAVITY_SOUTHEAST);
// Draw text on the watermark
$watermark->annotateImage($draw, 5, 15, 0, $text);
// Repeatedly overlay watermark on image
for ($w = 0; $w < $image->getImageWidth(); $w += 140) {
for ($h = 0; $h < $image->getImageHeight(); $h += 80) {
$image->compositeImage($watermark, Imagick::COMPOSITE_OVER, $w, $h);
}
}
// Set output image format
$image->setImageFormat('png');
// Output the new image
header('Content-type: image/png');
echo $image;
although there are plenty of command-line examples to be found on the ImageMagick website, so that is where we shall begin.
I'm trying to create a dynamic image in php with some text in it but it says the image cannot be displayed because it contains errors. Here's my code
<html>
<head>
</head>
<body>
<?php
$width = $_POST["width"];
$height = $_POST["height"];
$text = $_POST["text"];
$border = $_POST["border"];
$cornerangle = $_POST["angle"];
putenv('GDFONTPATH=' . realpath('.'));
header ('Content-Type: image/png');
$img = imagecreatetruecolor($width, $height);
$font = 'verdana';
$font_size = 20;
$angle = 45;
$text_box = imagettfbbox($font_size,$angle,$font,$text);
$text_width = $text_box[2]-$text_box[0];
$text_height = $text_box[3]-$text_box[1];
//coord text
$x = ($image_width/2) - ($text_width/2);
$y = ($image_height/2) - ($text_height/2);
$textcolor = imagecolorallocate($img,255,255,255);
imagettftext($img, $font_size, 0, $x, $y, $textcolor, $font, $text);
imagepng($img);
imagedestroy($img);
?>
</body>
</html>
I have the font file (verdana.ttf) in the same folder as my php file. I tried $font = 'verdana.ttf'; and got the same error.
You need to have the font in your web server and call it.
$font = 'path/verdana.ttf';
i tested your code, and work fine in my server.
I am doing my project in CodeIgniter. I am trying to call captcha.php file in index file.This captcha file in folder files. Currently, the captcha image is not viewing. I need to display random numbers in image.
captcha.php
<?php
session_start();
$string = '';
for ($i = 0; $i < 5; $i++) {
$string .= chr(rand(97, 122));
}
$_SESSION['random_number'] = $string;
$dir = 'fonts/';
$image = imagecreatetruecolor(165, 50);
// random number 1 or 2
$num = rand(1,2);
if($num==1)
{
$font = "PT_SANS-BOLD_1.TTF"; // font style
}
else
{
$font = "PT_SANS-ITALIC_1.TTF";// font style
}
// random number 1 or 2
$num2 = rand(1,2);
if($num2==1)
{
$color = imagecolorallocate($image, 113, 193, 217);// color
}
else
{
$color = imagecolorallocate($image, 163, 197, 82);// color
}
$white = imagecolorallocate($image, 255, 255, 255); // background color white
imagefilledrectangle($image,0,0,399,99,$white);
imagettftext ($image, 30, 0, 10, 40, $color, $dir.$font, $_SESSION['random_number']);
header("Content-type: image/png");
imagepng($image);
?>
in html file
<img src="<?= base_url();?>files/captcha.php" alt="" id="captcha" />
This is not an answer to your question but alternative you could opt for.
So many captcha scripts are already available may be you can use some of that instead of coding it again.
Check this
If you do go for this option then do make sure that fonts are placed in right places.