PHP Implementation Verification Code class

This article mainly introduces the use of PHP to implement verification code class, has a certain reference value, now share to everyone, the need for friends can refer to

<?phpclass code{//1. Define each member has width, height, canvas, word number, type, draw type private $width;//width private $height;//height private $num;//verification Code words private $i Mgtype; Generate picture type private $Type; String type three options 1 pure digit 2 Pure lowercase Letter 3 Case number mixed private $HB; Canvas public $codestr; Verify code string Public function __construct ($height =20, $num =4, $imgType = "jpeg", $Type =1) {$this->width = $num *20; $this Height = $height; $this->num = $num; $this->imgtype = $imgType; $this->type = $Type; $this->codestr = $this->codestr (); $this->zuhe ();} 2. Defines a random get String function Private Function codestr () {switch ($this->type) {Case 1://Type 1 gets 1-9 random number $str = Implode ("", Array_rand ( Range (0,9), $this->num)) Break;case 2://Type 2 gets a-Z random lowercase letter $str = Implode ("", Array_rand (Array_flip (range (a,z)), $ This->num)); Break;case 3://Type 3 get numbers, lowercase letters, uppercase mixed for ($i =0; $i < $this->num; $i + +) {$m = rand (0,2); switch ($m) { Case 0: $o = rand (48,57), break;case 1: $o = rand (65,90), break;case 2: $o = rand (97,122); } $str. = sprintf ("%c", $o);} Break } return $STR; }//3. Initialize Canvas Image Resource PRivate function Hb () {$this-&GT;HB = Imagecreatetruecolor ($this->width, $this->height);} 4. Generate background color private function Bg () {return imagecolorallocate ($this->hb,rand (130,250), Rand (130,250), Rand (130,250));} 5. Generate font Color private function font () {return imagecolorallocate ($this->hb,rand (0,100), Rand (0,100), Rand (0,100));} 6. Fill background color Private function BgColor () {imagefilledrectangle ($this->hb,0,0, $this->width, $this->height, $this- &GT;BG ()); }//7. Disturbance Point Private Function Ganrao () {$sum =floor (($this->width) * ($this->height)/3); for ($i =0; $i < $sum; $i + +) { Imagesetpixel ($this->hb,rand (0, $this->width), rand (0, $this->height), $this-&GT;BG ()); }}//8. Random straight arc Private Function Huxian () {for ($i =0; $i < $this->num; $i + +) {Imagearc ($this->hb,rand (0, $this->width) , rand (0, $this->height), rand (0, $this->width), rand (0, $this->height), rand (0,360), Rand (0,360), $this- Bg ()); }}//9. Write Private Function Xiezi () {for ($i =0; $i < $this->num; $i + +) {$x =ceil ($this->width/$this->nUM) * $i; $y =rand (1, $this->height-15) Imagechar ($this->hb,5, $x +4, $y, $this->codestr[$i], $this->font ());} }//10. Output Private Function outimg () {$shuchu = "image". $this->imgtype; $header = "content-type:image/". $this->imgtype;if (Function_exists ($shuchu)) {header ($header); $shuchu ($this-&GT;HB);} Else{exit ("GD library does not have such an image");}} 11. Assemble private Function Zuhe () {$this-&GT;HB (); $this->bgcolor (); $this->ganrao (); $this->huxian (); $this Xiezi (); $this->outimg (); }public function Getcodestr () {return $this->codestr;}} $a = new Code (); $a->getcodestr ();? >

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