PHP网页编程之经由过程PHP的File函数库来完成上传图象文件...
讲了这么多，无非是想说：学习PHP不仅要掌握方法，更多的是付出汗水，我不希望看到中途放弃的人，相信自己，相信自己的选择，更要相信自己的能力，如果自己想放弃，暴力一点的话，就自己抽自己一个嘴巴。函数|上传|显示 经由过程File文件函数来操作上传的图片,上面是转自zend.com上的一篇文章，有很多可取的地方，然而却感到到浩瀚的目次很乖僻，人人看了后可以互相会商一下：// 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 PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<title>Photo gallery</title>
</head>
<body>
<h1>Photo gallery</h1>
<?php
// full directory path
$filepath = "/home/httpd/html/tut/upload";
// user's path in browser -- same as full directory path
$url_path = "/tut/upload";
// get unique server directory used for this user session
$dir = dir($filepath);
// loop through all server subdirectories for this user session
while($entry=$dir->read()) {
// if entry is system file (doesn't have picture files), go to next entry in
// "while" loop
if($entry == "." || $entry == "..") {
continue;
}
// open server name 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, go to next entry in "while" loop
$fp = @fopen("$filepath/$entry/name","r");
if(!$fp) {
print "Bad entry: $entry<br>";
continue;
}
// get name of the server picture file and close the server name file
$name = fgets($fp,4096);
fclose($fp);
// display each picture and its file name; in addition, "alt=" causes the file
// name to be displayed as ToolTip text when mouse points to picture
?>
<img src="<? echo "$url_path/$entry/picture" ?>"
alt="<? echo $name ?>"> <b><? echo $name ?></b><br>
<?
}
?>
</body>
</html>
那么接下来，这就算学会啦?NO，NO，NO，还早呢，你至尽还没碰过OOP之类的吧?模板呢? 实践是检验自己会不会的真理。 建数据库表的时候，int型要输入长度的，其实是个摆设的输入几位都没影响的，只要大于4就行，囧。 这些都是最基本最常用功能，我们这些菜鸟在系统学习后，可以先对这些功能深入研究。 爱上php，他也会爱上你。 最后介绍一个代码出错，但是老找不到错误方法，就是 go to wc （囧），出去换换气没准回来就找到错误啦。 真正的方向了，如果将来要去开发团队，你一定要学好smarty ,phplib这样的模板引擎， 说php的话，首先得提一下数组，开始的时候我是最烦数组的，总是被弄的晕头转向，不过后来呢，我觉得数组里php里最强大的存储方法，所以建议新手们要学好数组。 做为1门年轻的语言，php一直很努力。 其实没啥难的，多练习，练习写程序，真正的实践比看100遍都有用。不过要熟悉引擎 首先声明：我是一个菜鸟，是一个初学者。学习了一段php后总是感觉自己没有提高，无奈。经过反思我认为我学习过程中存在很多问题，我改变了学习方法后自我感觉有了明显的进步。 其实没啥难的，多练习，练习写程序，真正的实践比看100遍都有用。不过要熟悉引擎 首先我是坚决反对新手上来就用框架的，因为对底层的东西一点都不了解，造成知识上的真空，会对以后的发展不利。我的观点上手了解下框架就好，代码还是手写。当然啦如果是位别的编程语言的高手的话，这个就另当别论啦。 这些都是最基本最常用功能，我们这些菜鸟在系统学习后，可以先对这些功能深入研究。 Apache不是非得用80或者8080端口的，我刚开始安得时候就是80端口老占用，就用了个 81端口，结果照常，就是输localhost的时候，应该输入为 localhost:81 首先声明：我是一个菜鸟，是一个初学者。学习了一段php后总是感觉自己没有提高，无奈。经过反思我认为我学习过程中存在很多问题，我改变了学习方法后自我感觉有了明显的进步。 Apache不是非得用80或者8080端口的，我刚开始安得时候就是80端口老占用，就用了个 81端口，结果照常，就是输localhost的时候，应该输入为 localhost:81 Apache不是非得用80或者8080端口的，我刚开始安得时候就是80端口老占用，就用了个 81端口，结果照常，就是输localhost的时候，应该输入为 localhost:81 如果你已经到这种程度了，那么你已经可以做我的老师了。其实php也分很多的区域， 本人接触php时间不长，算是phper中的小菜鸟一只吧。由于刚开始学的时候没有名师指，碰过不少疙瘩，呗很多小问题卡过很久，白白浪费不少宝贵的时间，在次分享一些子的学习的心得。
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