© / Posted in 知识如海 / July 14, 2009
<meta http-equiv="Content-Type" content="text/html; charset=UTF8">
<form method=post action="">
标题:<input type="text" name="title"><br>
内容:<textarea name="txt" rows="10" cols="40"></textarea><br>
操作:<input type="submit" value="提交"> <input type="reset">
</form>
PHP 函数：nl2br file_put_contents
<?php
/**
@title:最简留言本(PHP5)
@author:axgle
*/
$title=$_POST['title'];
$txt=$_POST['txt']; if($title&&$txt) {
$txt=nl2br($txt);
file_put_contents(__FILE__,"<b>$title</b> ".date("Y-m-d H:i:s")."<br>$txt<hr>",FILE_APPEND);
header('refresh:0');
}
?> 代码分析：file_put_contents
(PHP 5)file_put_contents -- 将一个字符串写入文件
说明
int file_put_contents ( string filename, string data [, int flags [, resource context]] )和依次调用 fopen()，fwrite() 以及 fclose() 功能一样。
参数 data 可以是数组（但不能为多元数组），这就相当于 file_put_contents($filename, join('', $array))
自 PHP 5.1.0 起，data 参数也可以被指定为 stream 资源，这里 stream 中所保存的缓存数据将被写入到指定文件中，这种用法就相似于使用 stream_copy_to_stream() 函数。
参数
filename
要被写入数据的文件名
data
要写入的数据。类型可以是 string、 array 或者是 stream 资源（如上面所说的那样）.
flags
flags 可以是 FILE_USE_INCLUDE_PATH, FILE_APPEND 和/或 LOCK_EX （获得一个独占锁定），然而使用 FILE_USE_INCLUDE_PATH 时要特别谨慎。
context
一个 context 资源
返回值
该函数将返回写入到文件内数据的字节数
__FILE__
文件的完整路径和文件名。如果用在包含文件中，则返回包含文件名。自 PHP 4.0.2 起，__FILE__ 总是包含一个绝对路径，而在此之前的版本有时会包含一个相对路径。
FILE_APPEND
增加在文件尾
字符串处理函数库:nl2br将换行字符转成 <br />
语法: string nl2br(string string);
返回值: 字符串
函数种类: 资料处理
内容说明
本函数将换行字符转换成 HTML 换行的
只是上面的这些的话，我在调试中发现了很多类似这样的错误
Notice: Undefined index: title in D:\wamp\www\_index.php on line 13
那么，怎么解决呢？
php运行出现 Notice: Undefined index,主要是由于变量没有事先定义造成的。因此在编写的时候要养成定义变量的习惯，虽然变量没有定义在php上是个小事情，但是有时候会造成很多麻烦。
在大量变量的基础上出现此noitce，如果对变量进行定义，会非常繁琐，一下是解决此问题的其他手段：
修改php.ini配置文件，error_reporting = E_ALL & ~E_NOTICE 或者 修改 display_errors = Off
每个文件头部加上：error_reporting(0);
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类型可以是 string、 array 或者是 stream 资源
我
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