PHP implementation Click to refresh the verification code, PHP implementation Refresh Verification Code _php tutorial

PHP implementation Click to refresh the verification code, PHP implementation Refresh verification code

Verification code class file CreateImg.class.php

<?php class Validationcode {private $width, $height, $codenum; public $checkcode;  The generated verification code private $checkimage; Verification code Picture Private $disturbColor = ';   Interference pixel function __construct ($width = ' a ', $height = ' ", $codenum = ' 4 ') {$this->width= $width;   $this->height= $height; $this->codenum= $codenum;   } function Outimg () {//Output header $this->outfileheader ();    Generate Verification Code $this->createcode ();   Produce picture $this->createimage ();   Set the interference pixel $this->setdisturbcolor ();   Write the verification code on the picture $this->writecheckcodetoimage ();   Imagepng ($this->checkimage); Imagedestroy ($this->checkimage);  } Private Function Outfileheader () {Header ("Content-type:image/png");}  Private Function Createcode () {$this->checkcode = Strtoupper (substr (MD5 (rand ()), 0, $this->codenum));}   Private Function CreateImage () {$this->checkimage = @imagecreate ($this->width, $this->height);   $back = Imagecolorallocate ($this->checkimage,255,255,255); $border = Imagecolorallocate ($this->checkimage,0,0,0); Imagefilledrectangle ($this->checkimage,0,0, $this->width-1, $this->height-1, $back);  White Bottom Imagerectangle ($this->checkimage,0,0, $this->width-1, $this->height-1, $border); Black Border} Private function Setdisturbcolor () {for ($i =0; $i <=200; $i + +) {$this->disturbcolor = Imagecolorallo   Cate ($this->checkimage, rand (0,255), Rand (0,255), Rand (0,255));   Imagesetpixel ($this->checkimage,rand (2,128), Rand (2,38), $this->disturbcolor); }} Private Function Writecheckcodetoimage () {for ($i =0; $i <= $this->codenum; $i + +) {$BG _color = Imagecolorall   Ocate ($this->checkimage, rand (0,255), Rand (0,128), Rand (0,255));   $x = Floor ($this->width/$this->codenum) * $i;   $y = rand (0, $this->height-15);   Imagechar ($this->checkimage, rand (5,8), $x, $y, $this->checkcode[$i], $bg _color); }} function __destruct () {unset ($this->width, $this->height, $this->codenum);}}  ?>

Include File imgcode.php

<?php session_start (); Require_once (' CreateImg.class.php '); $image = new Validationcode (' + ', ' 4 ');  Picture length, width, number of characters $image->outimg (); $_session[' validationcode ' = $image->checkcode; Storage verification code to $_session?>

Front desk File demo.php

? php session_start (); $test = $_post[' test ']; $test = Strtoupper (Trim ($test)); $submit = $_post[' Submit ']; if (Isset ($submit)) {if ($test ==$_session[' Validationcode ') {   echo ' true ';} else {   echo ' false ';}}?>    Image 
 
          

The above is for everyone to introduce the PHP click Verification code can be refreshed all the code, I hope that everyone's learning has helped.

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