《PHP编程最快明白》第七讲：php图片验证码与缩略图_php基础

实例22 图片验证的核心代码

 <BR><?php <BR>//header("content-type:image/png"); <BR>$num ='1234'; <BR>$imagewidth=60; <BR>$imageheight=18; <br><br>$numimage = imagecreate($imagewidth,$imageheight); <BR>imagecolorallocate($numimage,240,240,240); <BR>for($i=0;$i<strlen($num);$i++){ <BR>$x = mt_rand(1,8)+$imagewidth*$i/4; <BR>$y = mt_rand(1,$imageheight/4); <BR>$color=imagecolorallocate($numimage,mt_rand(0,150),mt_rand(0,150),mt_rand(0,150)); <BR>imagestring($numimage,5,$x,$y,$num[$i],$color); <BR>} <br><br>for($i=0;$i<200;$i++){ <BR>$randcolor=imagecolorallocate($numimage,rand(200,255),rand(200,255),rand(200,255)); <BR>imagesetpixel($numimage,rand()%70,rand()%20,$randcolor); <BR>} <BR>imagepng($numimage); <BR>imagedestroy($numimage); <BR>?> <BR>

这个是输出4个验证码的例子，对于汉字，需要font文件和imagettftext函数，用到的时候大家再网上搜索吧。你要产生随机数，那有mt_rand函数；你还要用到session保存这个随机数；如果需要转成utf-8，需要iconv函数。

实例23 缩略图

 <BR><?php <BR>class SimpleImage { <BR>var $image; <BR>var $image_type; <BR>function load($filename) { <BR>$image_info = getimagesize($filename); <BR>$this->image_type = $image_info[2]; <BR>if( $this->image_type == IMAGETYPE_JPEG ) { <BR>$this->image = imagecreatefromjpeg($filename); <BR>} elseif( $this->image_typ<strong style="color:transparent">￥本文来源gaodai#ma#com搞@@代~&码网^</strong><small>搞gaodaima代码</small>e == IMAGETYPE_GIF ) { <BR>$this->image = imagecreatefromgif($filename); <BR>} elseif( $this->image_type == IMAGETYPE_PNG ) { <BR>$this->image = imagecreatefrompng($filename); <BR>} <BR>} <BR>function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) { <BR>if( $image_type == IMAGETYPE_JPEG ) { <BR>imagejpeg($this->image,$filename,$compression); <BR>} elseif( $image_type == IMAGETYPE_GIF ) { <BR>imagegif($this->image,$filename); <BR>} elseif( $image_type == IMAGETYPE_PNG ) { <BR>imagepng($this->image,$filename); <BR>} <BR>if( $permissions != null) { <BR>chmod($filename,$permissions); <BR>} <BR>} <BR>function output($image_type=IMAGETYPE_JPEG) { <BR>if( $image_type == IMAGETYPE_JPEG ) { <BR>imagejpeg($this->image); <BR>} elseif( $image_type == IMAGETYPE_GIF ) { <BR>imagegif($this->image); <BR>} elseif( $image_type == IMAGETYPE_PNG ) { <BR>imagepng($this->image); <BR>} <BR>} <BR>function getWidth() { <BR>return imagesx($this->image); <BR>} <BR>function getHeight() { <BR>return imagesy($this->image); <BR>} <BR>function resizeToHeight($height) { <BR>$ratio = $height / $this->getHeight(); <BR>$width = $this->getWidth() * $ratio; <BR>$this->resize($width,$height); <BR>} <BR>function resizeToWidth($width) { <BR>$ratio = $width / $this->getWidth(); <BR>$height = $this->getheight() * $ratio; <BR>$this->resize($width,$height); <BR>} <BR>function scale($scale) { <BR>$width = $this->getWidth() * $scale/100; <BR>$height = $this->getheight() * $scale/100; <BR>$this->resize($width,$height); <BR>} <BR>function resize($width,$height) { <BR>$new_image = imagecreatetruecolor($width, $height); <BR>imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight()); <BR>$this->image = $new_image; <BR>} <BR>} <br><br>$newfile = UPLOAD_DIR."/icons/".md5($_SESSION['USER']->email).".jpg";//上传文件保存的目录 <BR>$image = new SimpleImage(); <BR>$image->load($_FILES['icons']['tmp_name']);//上传的临时文件名 <BR>$image->resizeToWidth(80);设置宽度 <BR>$image->save($newfile); <BR>?> <BR>

喜欢 (0)赏

[搞代码]

分享 (0)