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PHP generates image verification code and clicks to switch examples_PHP tutorial



PHP generates image verification code and clicks to switch examples_PHP tutorial
Jul 13, 2016 am 10:26 AM
php
Image verification code
Here is the effect:
Now let’s look at the PHP code
Copy code The code is as follows:
<?php
session_start();
function random($len) {
$srcstr = "1a2s3d4f5g6hj8k9qwertyupzxcvbnm";
mt_srand();
$strs = "";
for ($i = 0; $i < $len; $i++) {
$strs .= $srcstr[mt_rand(0, 30)];
}
Return $strs;
}
//Randomly generated string
$str = random(4);
//Width of verification code image
$width = 50;
//The height of the verification code image
$height = 25;
//Declare the image format of the layer to be created
@ header("Content-Type:image/png");
//Create a layer
$im = imagecreate($width, $height);
//Background color
$back = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);
//Blurred point color
$pix = imagecolorallocate($im, 187, 230, 247);
//Font color
$font = imagecolorallocate($im, 41, 163, 238);
//Draw the blur effect point
mt_srand();
for ($i = 0; $i < 1000; $i++) {
imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $pix);
}
//Output character
imagestring($im, 5, 7, 5, $str, $font);
//Output rectangle
imagerectangle($im, 0, 0, $width -1, $height -1, $font);
//Output picture
imagepng($im);
imagedestroy($im);
$str = md5($str);
//Select cookie
//SetCookie("verification", $str, time() + 7200, "/");
//Select Session
$_SESSION["verification"] = $str;
?>
Then just call it on the page:
Copy code The code is as follows:
<img id="checkpic" onclick="changing();" src='/images/checkcode.php' />
If you want to achieve the "Can't see clearly? Change one" effect, add the following JS to the page
Copy code The code is as follows:
function changing(){
Document.getElementById('checkpic').src="/images/checkcode.php?"+Math.random();
}
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