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This article is to share with you about how php implements the authentication code class. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Go directly to the code:

/ / Verification code class

Class ValidateCode {

Private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';// random factor

Private $code;// CAPTCHA

Private $codelen = 4 Band / CAPTCHA length

Private $width = 130bp / width

Private $height = 50 Splink / height

Private $img;// graphics resource handle

Font specified by private $font;//

Private $fontsize = 20position / specified font size

Private $fontcolor;// specifies the font color

/ / Constructor initialization

Public function _ construct () {

$this- > font = dirname (_ _ FILE__).'/ font/elephant.ttf';// note that the font path must be written correctly, otherwise the picture will not be displayed

}

/ / generate random codes

Private function createCode () {

$_ len = strlen ($this- > charset)-1

For ($iposit / iTunes / icodeln +) {

$this- > code. = $this- > charset [Mt _ rand

}

}

/ / generate background

Private function createBg () {

$this- > img = imagecreatetruecolor ($this- > width, $this- > height)

$color = imagecolorallocate ($this- > img, mt_rand (157255), mt_rand (157255), mt_rand (157255))

Imagefilledrectangle ($this- > img,0,$this- > height,$this- > width,0,$color)

}

/ / generate text

Private function createFont () {

$_ x = $this- > width / $this- > codelen

For ($iposit / iTunes / icodeln +) {

$this- > fontcolor = imagecolorallocate ($this- > img,mt_rand (0156), mt_rand (0156), mt_rand (0156))

Imagettftext ($this- > img,$this- > fontsize,mt_rand (- 30 x*$i+mt_rand 30), $this- > height / 1.4 font,$this- > code [$I])

}

}

/ / generate lines and snowflakes

Private function createLine () {

/ / Line

For ($itimatic, mt_rand (0156), mt_rand (0156))

Imageline ($this- > img,mt_rand (0penny-> width), mt_rand (0meme-> height), mt_rand (0meme-> width), mt_rand (0meme-> height), $color)

}

/ / Snowflake

For ($itimatic, mt_rand (200255), mt_rand (200255))

Imagestring ($this- > img,mt_rand (1jime 5), mt_rand (0djinthis-> width), mt_rand (0recorder-> height),'*', $color)

}

}

/ / output

Private function outPut () {

Header ('Content-type:image/png')

Imagepng ($this- > img)

Imagedestroy ($this- > img)

}

/ / external generation

Public function doimg () {

$this- > createBg ()

$this- > createCode ()

$this- > createLine ()

$this- > createFont ()

$this- > outPut ()

}

/ / obtain the verification code

Public function getCode () {

Return strtolower ($this- > code)

}

}

Output example:

How to use it:

1. Save the CAPTCHA class to a file named ValidateCode.class.php

2. Create a new file named captcha.php to call the class

Captcha.php

The copy code is as follows:

Session_start ()

Require'. / ValidateCode.class.php'; / / include the class first, and the actual path will be modified according to the actual situation.

$_ vc = new ValidateCode (); / / instantiate an object

$_ vc- > doimg ()

$_ SESSION ['authnum_session'] = $_ vc- > getCode (); / / the CAPTCHA is saved to SESSION

3. Reference to the page, the code is as follows:

The copy code is as follows:

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