Learn about encapsulating verification codes in PHP in one minute (Part 1)

We have learned so much about PHP in PHP. I don’t know how much you know about encapsulating verification codes. I believe that a large number of people will not know this part of the knowledge. So don’t worry, this article will lead you to learn more about it. Understand this content deeply.

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Examples of encapsulating verification codes in PHP:

First we create a new file, and then write their conditions, width, height, letters , numbers, alphanumeric mixture, interference points, background color, font color, etc.; then we define a function, and then we start to prepare the canvas, generate colors, and what kind of characters we need, interference points and prepare for output Type, prepare the output image for final destruction; the specific code is as follows:

//1 width and height alphanumeric alphanumeric mixed interference line interference point background color font color

function verify($width = 100，$height=40，$num =5，$type =1)

//1. Prepare the canvas

$image = imagecreatetruecolor (Swidth，$height) ;

//3What kind of characters do you need

switch ($type) ( case 1 : $str = '0123456789' ; $string=substr(str_ shuffle($str) ，0，$num) ; break; case 2 : $arr = range('a' ，'z') ; shuffle ($arr) ; $tmp array_slice($arr ，0，5) ; $string = join(''，$tmp) ; break; case 3 : //0-9 a-z A-2. $str=' 123456789abcdefghjklmnopqrstuvwxyzABCDE FGHJKLMNOPQRSTUYWXYZ'; $string = substr (str_shuffle($str) ，0，$num) ; break; }

//Shallow Color

function lightColor () { return imagecolorallocate ($image，mt_rand(130，255) ，mt_rand(130,255) ， mt_rand(130，255)) ; // 0-255 } function deepColor () { }

According to the above code demonstration, we need to establish their specifications, colors and character styles we need, etc.;

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