PHP login page verification code implementation

For PHP login page verification code implementation, open Dreamweaver cs6 and create a PHP site:

Create a new file named 111. php and double-click edit to clear the HTML code automatically generated by Dreamweaver, as shown below;

Add the PHP code in the Dreamweaver CS6 editor as follows:

Session_start ();

Header ("Content-Type: image/png"); // Set the header information of the page to png image $ im = imagecreate (60, 20); // Create a canvas

$ Im_color = imagecolorallocate ($ im, 100,100,100); // fill in the verification code. The background is gray.

For ($ I = 0; $ I <4; $ I ++)

{

$ Line_color = imagecolorallocate ($ im, rand (0,255), rand (0,255), rand (0,255 ));

Imageline ($ im, rand (), $ line_color );

}

// Draw four random interference lines in a practical cycle

$ N = rand );

$ _ SESSION ["y"] = $ n;

$ P = 0;

For ($ I = 0; $ I <4; $ I ++)

{

$ P = $ p + 10;

$ Num = substr ($ n, $ I, 1); // Obtain the verification code numbers one by one.

$ Num_color = imagecolorallocate ($ instant, rand (0,255), rand (0,255), rand (0,255 ));

Imagettftext ($ im, rand (10, 15), rand (-10, 10), $ p, rand (10, 15), $ num_color, "font1.ttf", $ num );

}

// Set the color, angle deviation, and font of each verification code number.

Imagepng ($ im); // output the verification code

Imagedestroy ($ im); // release memory

?>

Then,

Create a login. php file;

The nickname of the username text box is name;

The password text box is; you can write it as needed

The verification code is. you can write it as needed.

Form submission method is post and submitted to check. php.

End