通过File文件函数来操作上传的图片,下面是转自zend.com上的一篇文章，有许多可取之处，但是却感觉到众多的目录很古怪，大家看了后可以相互讨论一下：

// FILE 1: DISPLAY AND PROCESS ENTRY FORM AND UPLOAD PICTURE FILE TO SERVER
<?php

// full directory path
$filepath = "/home/httpd/html/tut/upload";

// 200K is the maximum (picture) file size to be accepted
define("MAX_FILE_SIZE", 200*1024);

function print_error ($err) {
    echo "<h1>$err</h1><hr>";
}

do {
    // check if picture name variable has a value; if not, skip to the
    // "while(false)" section of "do" statement
    if(isset($picture)) {
        // here is where the server transparently checks that the client picture file
        // doesn't exceed maximum allowable size
        if(getenv("CONTENT_LENGTH") > MAX_FILE_SIZE) {
            print_error("File too large: $picture_name");
            break;
        }

        // open client picture file for read only; "@" prefix tells fopen not to print
        // message if there is an error, since function print_error does that

        // if there is an error, break out of "do" loop and continue at "while(false)"

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在google里搜索更多通过PHP的File函数库来完成上传图像文件并让其显示

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