PHP generates random verification code image code_PHP tutorial

Copy code The code is as follows:

/**Default homepage **/
class DefaultController extends AppController
{
public function index() {
$len = 5;
$str = "ABCDEFGHIJKLNMPQRSTUVWXYZ123456789";

$im = imagecreatetruecolor ( 70, 20 ) ;
$bgc = imagecolorallocate($im, 255, 255, 255);
$bgtxt = imagecolorallocate($im, 220, 220, 220);

//Random palette
$colors = array(
imagecolorallocate($im, 255, 0, 0),
imagecolorallocate($im, 0, 200, 0),
imagecolorallocate($im, 0, 0, 255 ),
imagecolorallocate($im, 0, 0, 0),
imagecolorallocate($im, 255, 128, 0),
imagecolorallocate($im, 255, 208, 0),
imagecolorallocate($im, 98, 186, 245),
);

//Fill the background color
imagefill($im, 0, 0, $bgc);

//Get numbers randomly
$verify = "";
while (strlen($verify) < $len) {
$i = strlen($verify);
$random = $str [rand(0, strlen($str))];
$verify .= $random;

//Draw background text
imagestring($im, 6, ($i*10) +3, rand(0,6), $random, $bgtxt);
//Draw the main text information
imagestring($im, 6, ($i*10)+3, rand(0,6 ), $random, $colors[rand(0, count($colors)-1)]);
}

//Add random noise
for($i=0; $ i<100; $i++) {
$color = imagecolorallocate($im, rand(50,220), rand(50,220), rand(50,220));
imagesetpixel($im, rand(0,70), rand(0,20), $color);
}

//Save the verification code in $_SESSION
sess("verify", $verify);

//Output the image and release the cache
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
}
};
?>

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