PHP压缩裁剪图片实例

Dear 丶 2022-06-01 01:45 260阅读 0赞

/**
         * @param $srcImage 原图片路径
         * @param $toFile   裁剪后图片路径
         * @param int $maxWidth   裁剪最大的宽度
         * @param int $maxHeight  裁剪后最大的高度
         * @param int $imgQuality 图片的质量
         * @return bool|string|void
         */
        function resize($srcImage,$toFile,$maxWidth = 640,$maxHeight = 480,$imgQuality=100)
        {
            list($width, $height, $type, $attr) = getimagesize($srcImage);
            if($width < $maxWidth  || $height < $maxHeight) return ;
            switch ($type) {//判断图片类别
                case 1: $img = imagecreatefromgif($srcImage); break;
                case 2: $img = imagecreatefromjpeg($srcImage); break;
                case 3: $img = imagecreatefrompng($srcImage); break;
            }
            $scale = min($maxWidth/$width, $maxHeight/$height);
            if($scale < 1) {
                $newWidth = floor($scale*$width);
                $newHeight = floor($scale*$height);
                $newImg = imagecreatetruecolor($newWidth, $newHeight);
                imagecopyresampled($newImg, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
                $newName = "";
                $toFile = preg_replace("/(.gif|.jpg|.jpeg|.png)/i","",$toFile);
                switch($type) {
                    case 1: if(imagegif($newImg, "$toFile$newName.gif", $imgQuality))
                        return "$newName.gif"; break;
                    case 2: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
                        return "$newName.jpg"; break;
                    case 3: if(imagepng($newImg, "$toFile$newName.png", $imgQuality))
                        return "$newName.png"; break;
                    default: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
                        return "$newName.jpg"; break;
                }
                imagedestroy($newImg);
            }
            imagedestroy($img);
            return false;
        }