通过PHP的File函数库来完成上传图像文件并让其显示

王朝php·作者佚名  2006-11-24
窄屏简体版  字體: |||超大  

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)"

$fp = @fopen($picture,"r");

if(!$fp) {

print_error("Cannot open file: $picture_name");

break;

}

// generate unique name for session, use it to generate unique server

// directory name, and create the directory

srand((double) microtime() * 1000000);

$id = md5(uniqid(rand()));

$dirname = "$filepath/$id";

mkdir($dirname,0700);

// create the server picture file in the newly created server directory

$filename = $dirname . "/picture";

// open server picture file for write 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)"

$out = @fopen($filename,"w");

if(!$out) {

print_error("Cannot open file: $filename");

break;

}

// copy client picture file to server picture file

while($buffer = fread($fp,8192)) {

fwrite($out,$buffer);

}

// close client picture file and server picture file

fclose($fp);

fclose($out);

// create server name file in picture file directory; this file will hold the

// name of the picture file

$filename = $dirname . "/name";

// open server name file for write 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)"

$out = @fopen($filename,"w");

if(!$out) {

print_error("Cannot open file: $filename");

break;

}

// write the server picture name to the server name file, and close the server

// name file

fputs($out,$name);

fclose($out);

// display message that client picture file was successfully copied to the

// server, display a prompt to look at updated server photo gallery, and supply

// the HTML link

?>

Picture added. Thanks.<br>

<a href="upload_display.php">Continue to the gallery</a>

<?php

// exit to the server photo gallery

exit();

}

} while(false);

// you get to here only when "if(isset($picture))" is false, which means that

// no picture name has been submitted, therefore go display the input form where

// the necessary information can be entered

?>

<!-- start upload form -->

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">

<html>

<head>

<title>Photo gallery - add</title>

</head>

<body bgcolor="white">

<h1>Photo gallery add</h1>

<?php

// start of segment of code for displaying input form

// using $PHP_SELF for value of "form action" causes form to refer to itself

// when "submit" button is clicked

?>

<form action="<? echo $PHP_SELF ?>" method=POST ENCTYPE="multipart/form-data">

<?php

// pass the PHP constant MAX_FILE_SIZE to the HTML maximum file size

// constant MAX_FILE_SIZE

?>

<INPUT TYPE="hidden" name="MAX_FILE_SIZE" value="<? echo MAX_FILE_SIZE ?>">

<?php

// display the text boxes for entering user name and picture name, and store

// the entered values in PHP variables; browsing is enabled

?>

Your name is: <INPUT NAME="name"><br>

Your picture: <INPUT NAME="picture" TYPE="file"><br>

<?php

// display the "submit" button

?>

<INPUT TYPE="submit" VALUE="Add picture" name="send">

</form>

</body>

</html>

// ------------------------------------------------------

// FILE 2: DISPLAY THE SERVER PHOTO GALLERY

<!DOCTYPE HTML PUBL

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