Simple PHP validation image generation function _php Tutorial

Copy CodeThe code is as follows:
function Yzm ($name, $width, $height) {
Header ("Content-type:image/png");
Srand (Double) microtime () *1000000);//sow a seed that generates random numbers to facilitate the use of random number generation below
Session_Start ();//storing random numbers in session
$_session[$name]= "";
$im = Imagecreate ($width, $height); Make picture background size
$black = Imagecolorallocate ($im, 0,0,0); Set of three Colors
$white = Imagecolorallocate ($im, 255,255,255);
$gray = Imagecolorallocate ($im, 200,200,200);
Imagefill ($im, 0,0, $gray); Using area Fill method, set (0,0)
while (($authnum =rand ()%100000) <10000);
$_session[$name]= $authnum;
Imagestring ($im, 5, 3, $authnum, $black);
for ($i =0; $i <200; $i + +)//Add interfering pixels
{
$randcolor = Imagecolorallocate ($im, Rand (0,255), Rand (0,255), Rand (0,255));
Imagesetpixel ($im, Rand ()%70, Rand ()%30, $randcolor);
}
Imagepng ($im);
Imagedestroy ($im);
}?>

Use the method to create a PHP file into the yzm.php, calling
Call the parameters into this function.

http://www.bkjia.com/PHPjc/320105.html www.bkjia.com true http://www.bkjia.com/PHPjc/320105.html techarticle Copy the code as follows: Php function Yzm ($name, $width, $height) {Header ("content-type:image/png"); Srand ((Double) microtime () * 1000000);//sow a seed that generates a random number, ...

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