how to add image capthcha in php
STEP 1 : GENERATE RANDOM STRING
First we create a php file name like captcha.php. then copy this code and paste there.
<?php
session_start();
function getRandomCaptchaText($len = 5)
{
$word = array_merge(range('0', '9'), range('A', 'Z'));
shuffle($word);
return substr(implode($word), 0, $len);
}
$ranStr = getRandomCaptchaText();
$_SESSION["captcha_text"] = $ranStr;
$height = 40; //CAPTCHA image height
$width = 160; //CAPTCHA image width
$font_size = 22; //CAPTCHA Font size
$image_p = imagecreate($width, $height);
$graybg = imagecolorallocate($image_p, 245, 245, 245);
$textcolor = imagecolorallocate($image_p, 34, 34, 34);
imagefttext($image_p, $font_size, -2, 15, 26, $textcolor, 'font/liberation-mono.regular.ttf', $ranStr);
imagepng($image_p);
?>NOTE : Please make a font folder and place a any font ttf file. As we hightlight on above
Step 2 : After All this then Please create a demo.php file.
<head>
<title>Captcha Image </title>
<script type="text/javascript">
function reloadCaptcha()
{
img = document.getElementById("new-captcha");
img.src="captcha.php?rand_number=" + Math.random();
}
</script>
</head>
<body >
<form type=post action="#">
<input type=text name="key">
<img src="captcha.php" id="new-captcha"/>
<br>
<input type=button onClick=reloadCaptcha(); value='Reload image'>
<input type=submit value='submit'>
</form>
</body>
</html> Share
Manish Garg
You can use an existing image for print captcha text
and use the code given below for jpg format
session_start(); $ranStr = microtime(); $ranStr = rand(100,1000); $_SESSION['cap_code']=$ranStr; $imagepath="images/cap_bg.jpg"; $newImage = imagecreatefromjpeg($imagepath); $txtColor = imagecolorallocate($newImage, 0, 0, 0); imagestring($newImage, 5, 5, 5, $ranStr, $txtColor); header("Content-type: images/jpeg"); imagejpeg($newImage);here is a sample image
http://www.developersmap.com/wp-content/uploads/2019/06/cap_bg.jpg