上传时使用脚本优化图片

Question

我尝试在上传时将图像上传到服务器，我需要优化图像

• 我需要优化脚本
• 文件类型(jpeg,png,gif)

我发现了很多在线工具，例如 http://www.smushit.com/ysmush.it/，但我需要脚本才能使用脚本

<input name="file" type="file" id="ufile" />这是正在使用的输入法

• 如何优化图片并保存到自定义文件夹

上传脚本

<form action="for.php" method="post" enctype="multipart/form-data" name="form1" id="form1">
         <input name="file" type="file" id="ufile" size="50" /><br>
            <input type="submit" name="submit">
        </form> 

Answer 1

试试这个函数，在我的程序中使用它可以正常工作

<?php
############ Configuration ##############
$thumb_square_size      = 200; //Thumbnails will be cropped to 200x200 pixels
$max_image_size         = 5000; //Maximum image size (height and width)
$thumb_prefix           = "thumb_"; //Normal thumb Prefix
$destination_folder     = 'uploads/'; //upload directory ends with / (slash)
$jpeg_quality           = 90; //jpeg quality
##########################################

//continue only if $_POST is set and it is a Ajax request
if(isset($_POST) && isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&     strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){

// check $_FILES['ImageFile'] not empty
if(!isset($_FILES['image_file']) || !is_uploaded_file($_FILES['image_file']    ['tmp_name'])){
        die('Image file is Missing!'); // output error when above checks     fail.
}

//uploaded file info we need to proceed
$image_name = $_FILES['image_file']['name']; //file name
$image_size = $_FILES['image_file']['size']; //file size
$image_temp = $_FILES['image_file']['tmp_name']; //file temp

$image_size_info    = getimagesize($image_temp); //get image size

if($image_size_info){
    $image_width        = $image_size_info[0]; //image width
    $image_height       = $image_size_info[1]; //image height
    $image_type         = $image_size_info['mime']; //image type
}else{
    die("Make sure image file is valid!");
}

//switch statement below checks allowed image type 
//as well as creates new image from given file 
switch($image_type){
    case 'image/png':
        $image_res =  imagecreatefrompng($image_temp); break;
    case 'image/gif':
        $image_res =  imagecreatefromgif($image_temp); break;           
    case 'image/jpeg': case 'image/pjpeg':
        $image_res = imagecreatefromjpeg($image_temp); break;
    default:
        $image_res = false;
}

if($image_res){
    //Get file extension and name to construct new file name 
    $image_info = pathinfo($image_name);
    $image_extension = strtolower($image_info["extension"]); //image extension
    $image_name_only = strtolower($image_info["filename"]);//file name only, no     extension

    //create a random name for new image (Eg: fileName_293749.jpg) ;
    $new_file_name = $image_name_only. '_' .  rand(0, 9999999999) . '.' .     $image_extension;

    //folder path to save resized images and thumbnails
    $thumb_save_folder  = $destination_folder . $thumb_prefix .     $new_file_name; 
    $image_save_folder  = $destination_folder . $new_file_name;

    //call normal_resize_image() function to proportionally resize image
    if(normal_resize_image($image_res, $image_save_folder, $image_type,     $max_image_size, $image_width, $image_height, $jpeg_quality))
    {
        //call crop_image_square() function to create square thumbnails
        if(!crop_image_square($image_res, $thumb_save_folder, $image_type,     $thumb_square_size, $image_width, $image_height, $jpeg_quality))
        {
            die('Error Creating thumbnail');
        }

        /* We have succesfully resized and created thumbnail image
        We can now output image to user's browser or store information in     the database*/
        echo '<div align="center">';
        echo '<img src="uploads/'.$thumb_prefix . $new_file_name.'"     alt="Thumbnail">';
        echo '<br />';
        echo '<img src="uploads/'. $new_file_name.'" alt="Resized Image">';
        echo '</div>';
    }

    imagedestroy($image_res); //freeup memory
}
}