php驗證碼和不能正常顯示解決辦法

php驗證碼和不能正常顯示解決方案

效果

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檔案都放到了同一檔案夾下。

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CreateImage.class.php

width=$width;   $this->height=$height;   $this->codenum=$codenum;}function outImg(){   //輸出頭   $this->outFileHeader();   //產生驗證碼   $this->createCode();   //產生圖片   $this->createImage();   //設定幹擾像素   $this->setDisturbColor();   //往圖片上寫驗證碼   $this->writeCheckCodeToImage();   imagepng($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); // 白色底   imagerectangle($this->checkimage,0,0,$this->width - 1,$this->height - 1,$border);   // 黑色邊框}private function setDisturbColor(){   for ($i=0;$i<=200;$i++)   {$this->disturbColor = imagecolorallocate($this->checkimage, rand(0,255), rand(0,255), rand(0,255));imagesetpixel($this->checkimage,rand(2,128),rand(2,38),$this->disturbColor);   }}private function writeCheckCodeToImage(){   for ($i=0;$i<=$this->codenum;$i++)   {$bg_color = imagecolorallocate ($this->checkimage, rand(0,255), rand(0,128), rand(0,255));$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);}}

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checks.php

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index.php

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rand函數的應用

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************************************容易出現的問題*************

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1.未開啟php_gd2.dll? 去php.ini將其前面的“ ;”去掉

2.上面的checks.php中

3.字元編碼改為統一的

4.最容易忽略的一點：

? 你本機上的環境是將報錯提示全部開啟的,所以在輸出時有系統的未定義提示資訊也跟著一起輸出了,這樣產生的圖片肯定就不正常了,方法有兩,在ValidationCode.php和checks.php檔案開頭加上ini_set('display_errors',?'Off');??就ok了

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