【PHP】图片操作类

刚学php不久，在做一个项目一步步的积累和学习，希望分享的东西能其他人带来帮助，少走弯路。

<?php

/**

 *    图片操作类

 * @author Harlan Song

 */



/**

 * 压缩图片，以宽度为基准，高度等比例压缩。

 * @param string $srcPath 源图片路径

 * @param string $newPath 压缩后图片路径

 *  @param string $newWidth 最大宽度

 */

function commpressImage($srcPath,$newPath,$newWidth){

    $info = getimagesize($srcPath);

    $width = $info[0];

    $height = $info[1];

    $mime = $info['mime'];//得到图片类型

    if($width > $newWidth){

        $newHeight = $height / ($width / $newWidth);

        $newImg = imagecreatetruecolor($newWidth,$newHeight);

        switch($mime){

            case "image/jpeg":

                $img = @imagecreatefromjpeg($srcPath);

                imagecopyresampled($newImg,$img,0,0,0,0,$newWidth,$newHeight,$width,$height);

                imagejpeg($newImg,$newPath);

                break;

            case "image/png":

                $img = @imagecreatefrompng($srcPath);

                imagecopyresampled($newImg,$img,0,0,0,0,$width,$height,$newWidth,$newHeight);

                imagepng($newImg,$newPath);

                break;

            case "image/gif":

                $img = @imagecreatefromgif($srcPath);

                imagecopyresampled($newImg,$img,0,0,0,0,$width,$height,$newWidth,$newHeight);

                imagegif($newImg,$newPath);

                break;

            case "image/wbmp":

                $img = @imagecreatefromwbmp($srcPath);

                imagecopyresampled($newImg,$img,0,0,0,0,$width,$height,$newWidth,$newHeight);

                imagewbmp($newImg,$newPath);

                break;

        }

    }else{

        //源图片宽度比指定值小，不压缩直接复制。

        copy($srcPath,$newPath);

    }

}



?>