php文件上传类upload_class的扩展类及示例

分享一个上传图片文件的php扩展类，基于前文：php文件上传类与实例的一个扩展。
主要用于上传图片文件。

代码：

<?php 
/**
* php图片上传类
* 基类：file_upload
* 编辑：www.jb200.com
*/
include ($_SERVER['DOCUMENT_ROOT']."/classes/upload/upload_class.php"); 
error_reporting(E_ALL); 
ini_set("memory_limit", "64M"); 
set_time_limit(60); 

class Foto_upload extends file_upload { 
     
    var $x_size; 
    var $y_size; 
    var $x_max_size = 300; 
    var $y_max_size = 200; 
    var $x_max_thumb_size = 110; 
    var $y_max_thumb_size = 88; 
    var $thumb_folder; 
    var $foto_folder; 
    var $larger_dim; 
    var $larger_curr_value; 
    var $larger_dim_value; 
    var $larger_dim_thumb_value; 
     
    var $use_image_magick = true; // switch between true and false 
    // I suggest to use ImageMagick on Linux/UNIX systems, it works on windows too, but it's hard to configurate 
    // check your existing configuration by your web hosting provider 
     
    function process_image($landscape_only = false, $create_thumb = false, $delete_tmp_file = false, $compression = 85) { 
        $filename = $this->upload_dir.$this->file_copy; 
        $this->check_dir($this->thumb_folder); // run these checks to create not existing directories 
        $this->check_dir($this->foto_folder); // the upload dir is created during the file upload (if not already exists) 
        $thumb = $this->thumb_folder.$this->file_copy; 
        $foto = $this->foto_folder.$this->file_copy; 
        if ($landscape_only) { 
            $this->get_img_size($filename); 
            if ($this->y_size > $this->x_size) { 
                $this->img_rotate($filename, $compression); 
            } 
        } 
        $this->check_dimensions($filename); // check which size is longer then the max value 
        if ($this->larger_curr_value > $this->larger_dim_value) { 
            $this->thumbs($filename, $foto, $this->larger_dim_value, $compression); 
        } else { 
            copy($filename, $foto); 
        } 
        if ($create_thumb) { 
            if ($this->larger_curr_value > $this->larger_dim_thumb_value) { 
                $this->thumbs($filename, $thumb, $this->larger_dim_thumb_value, $compression); // finally resize the image 
            } else { 
                copy($filename, $thumb); 
            } 
        } 
        if ($delete_tmp_file) $this->del_temp_file($filename); // note if you delete the tmp file the check if a file exists will not work 
    } 
    function get_img_size($file) { 
        $img_size = getimagesize($file); 
        $this->x_size = $img_size[0]; 
        $this->y_size = $img_size[1]; 
    } 
    function check_dimensions($filename) { 
        $this->get_img_size($filename); 
        $x_check = $this->x_size - $this->x_max_size; 
        $y_check = $this->y_size - $this->y_max_size; 
        if ($x_check < $y_check) { 
            $this->larger_dim = "y"; 
            $this->larger_curr_value = $this->y_size; 
            $this->larger_dim_value = $this->y_max_size; 
            $this->larger_dim_thumb_value = $this->y_max_thumb_size; 
        } else { 
            $this->larger_dim = "x"; 
            $this->larger_curr_value = $this->x_size; 
            $this->larger_dim_value = $this->x_max_size; 
            $this->larger_dim_thumb_value = $this->x_max_thumb_size; 
        } 
    } 
    function img_rotate($wr_file, $comp) { 
        $new_x = $this->y_size; 
        $new_y = $this->x_size; 
        if ($this->use_image_magick) { 
            exec(sprintf("mogrify -rotate 90 -quality %d %s", $comp, $wr_file)); 
        } else { 
            $src_img = imagecreatefromjpeg($wr_file); 
            $rot_img = imagerotate($src_img, 90, 0); 
            $new_img = imagecreatetruecolor($new_x, $new_y); 
            imageantialias($new_img, TRUE); 
            imagecopyresampled($new_img, $rot_img, 0, 0, 0, 0, $new_x, $new_y, $new_x, $new_y); 
            imagejpeg($new_img, $this->upload_dir.$this->file_copy, $comp); 
        } 
    } 
    function thumbs($file_name_src, $file_name_dest, $target_size, $quality = 80) { 
        //print_r(func_get_args()); 
        $size = getimagesize($file_name_src); 
        if ($this->larger_dim == "x") { 
            $w = number_format($target_size, 0, ',', ''); 
            $h = number_format(($size[1]/$size[0])*$target_size,0,',',''); 
        } else { 
            $h = number_format($target_size, 0, ',', ''); 
            $w = number_format(($size[0]/$size[1])*$target_size,0,',',''); 
        } 
        if ($this->use_image_magick) { 
            exec(sprintf("convert %s -resize %dx%d -quality %d %s", $file_name_src, $w, $h, $quality, $file_name_dest)); 
        } else { 
            $dest = imagecreatetruecolor($w, $h); 
            imageantialias($dest, TRUE); 
            $src = imagecreatefromjpeg($file_name_src); 
            imagecopyresampled($dest, $src, 0, 0, 0, 0, $w, $h, $size[0], $size[1]); 
            imagejpeg($dest, $file_name_dest, $quality); 
        } 
    } 
} 

$max_size = 1024*1024; // the max. size for uploading (~1MB) 
define("MAX_SIZE", $max_size); 
$foto_upload = new Foto_upload; 

$foto_upload->upload_dir = $_SERVER['DOCUMENT_ROOT']."/files/"; // "files" is the folder for the uploaded files (you have to create these folder) 
$foto_upload->foto_folder = $_SERVER['DOCUMENT_ROOT']."/files/photo/"; 
$foto_upload->thumb_folder = $_SERVER['DOCUMENT_ROOT']."/files/thumb/"; 
$foto_upload->extensions = array(".jpg"); // specify the allowed extension(s) here 
$foto_upload->language = "en"; 
$foto_upload->x_max_size = 300; 
$foto_upload->y_max_size = 200; 
$foto_upload->x_max_thumb_size = 120; 
$foto_upload->y_max_thumb_size = 150; 
         
if (isset($_POST['Submit']) && $_POST['Submit'] == "Upload") { 
    $foto_upload->the_temp_file = $_FILES['upload']['tmp_name']; 
    $foto_upload->the_file = $_FILES['upload']['name']; 
    $foto_upload->http_error = $_FILES['upload']['error']; 
    $foto_upload->replace = (isset($_POST['replace'])) ? $_POST['replace'] : "n"; // because only a checked checkboxes is true 
    $foto_upload->do_filename_check = "n";  
    if ($foto_upload->upload()) { 
        $foto_upload->process_image(false, true, 80); 
        $foto_upload->message[] = "Processed foto: ".$foto_upload->file_copy."!"; // "file_copy is the name of the foto" 
    } 
} 
$error = $foto_upload->show_error_string(); 
?>

2，上传图片的调用示例

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
<title>php图片上传类的调用示例-www.jb200.com</title> 
<style type="text/css"> 
<!-- 
body { 
    text-align:center; 
} 
label { 
    margin:0; 
    float:left; 
    display:block; 
    width:120px; 
} 
#main { 
    width:350px; 
    margin:0 auto; 
    padding:20px 0; 
    text-align:left; 
} 
--> 
</style> 
</head> 
<body> 
<div id="main"> 
  <h1>上传图片</h1> 
  <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data"> 
    <input type="hidden" name="MAX_FILE_SIZE" value="<?php echo $max_size; ?>"><br> 
    <div> 
      <label for="upload">选择图片文件：</label> 
    <input type="file" name="upload" id="upload" size="35"></div> 
    <div> 
      <label for="replace">替换旧的图片文件吗？</label> 
    <input type="checkbox" name="replace" value="y"></div> 
    <p style="margin-top:25px;text-align:center;"><input type="submit" name="Submit" id="Submit" value="上传图片"> 
    </p> 
  </form> 
  <p><?php echo $error; ?></p> 
</div>   
</body> 
</html>