note 68296 deleted from ref.image by tularis
| From: | tularis@php.net | Date: | Sun, 29 Jun 2008 21:01:33 +0000 |
| Subject: | note 68296 deleted from ref.image by tularis | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-140921@lists.php.net to get a copy of this message | ||
Note Submitter: sampathperera at hotmail dot com - Sri Lanka
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I have used following function to generate Security Images to authenticate users are real humans.
Need to have GD graphic library with FreeType enabled.
Used a gif file as background, put random text on it & creates a new gif file as output.
<?php
function createImage(){
// creates the images, writes the file
$fileRand = md5(rand(100000,999999));
$string_a =
array("A","B","C","D","E","F","G","H","J","K",
"L","M","N","P","R","S","T","U","V","W","X","Y","Z",
"2","3","4","5","6","7","8","9");
$keys = array_rand($string_a, 6);
foreach($keys as $n=>$v){
$string .= $string_a[$v];
}
$backgroundimage = "security_background.gif";
$im=imagecreatefromgif($backgroundimage);
$colour = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));
$font = 'Arial';
$angle = rand(-5,5);
// Add the text
imagettftext($im, 16, $angle, 15, 25, $colour, $font, $string);
$outfile= "$fileRand.gif";
imagegif($im,$outfile);
return $outfile;
}
echo "<IMG SRC=".createImage()." name=secimg>";
?>