使用php寫出一個驗證碼圖片，由於寬度被定死了，所以操作起來不太方便，之後盡量寫靈活，成為一個可調用的函數。

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<?php// Due to the height and width of the captcha image is fixed, not so easy to use, change will be diffic// Declare the following code to the browser is displayed as a pictureheader(‘Content-type:image/jpeg‘);// Width 120$width=120;// Height 40$height=40;// Draws an image that 120*40$img = imagecreatetruecolor($width, $height);// Random letters in the captcha$ele = array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");$string = "";for($i = 0; $i < 4; $i++) {$string.=$ele[rand(0,count($ele)-1)];}// The image‘s background color$colorBg = imagecolorallocate($img, rand(200,255), rand(200,255), rand(200,255));// The image‘s border color$colorBorder = imagecolorallocate($img, rand(200,255), rand(200,255), rand(200,255));// font color$colorString = imagecolorallocate($img, rand(10,100), rand(10,100), rand(10,100));// Fill color to the imageimagefill($img, 0, 0, $colorBg);// draw the rectangleimagerectangle($img, 0, 0, $width-1, $height-1, $colorBorder);for($i = 0; $i < 100; $i++) {// Using Stochastic methods to draw pointsimagesetpixel($img, rand(0,$width-1), rand(0,$height-1), imagecolorallocate($img,rand(100,150), rand(100,150), rand(100,150)));}// Draws a linefor($i = 0; $i < 3; $i++) {imageline($img, rand(0,$width/2), rand(0,$height/2), rand($width/2,$width), rand(0,$height), imagecolorallocate($img,rand(100,150), rand(100,150), rand(100,150)));}// fontimagettftext($img, rand(15,20), rand(-5,10), rand(10,20), rand(30,35), $colorString, ‘GARTON.TTF‘, $string);// Output Imageimagejpeg($img);//  release the memory being used by the image, and then clear the graphicimagedestroy($img);?>

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使用php寫出一個驗證碼圖片，由於寬度被定死了，所以操作起來不太方便，之後盡量寫靈活，成為一個可調用的函數。