Backend DevelopmentPHP TutorialPHP uses the built-in function file_put_contents to write files and append content_php tipsPHP uses the built-in function file_put_contents to write files and append content_php tips
本文实例讲述了PHP使用内置函数file_put_contents写入文件及追加内容的方法。分享给大家供大家参考，具体如下：
PHP 内置函数 file_put_contents 用于写入文件：
file_put_contents 函数最简单的写法，可以只用两个参数，一个是文件路径，一个是要写入的内容，语法如下：
如果文件不存在，file_put_contents 函数会自动创建文件；如果文件已存在，原有文件被重写。
你可以利用 file_put_contents 函数创建并写入一个新文件，或者重写一个原有文件。
下面是一个使用 file_put_contents 函数的 PHP 代码示例：
<html>
<body>
<?php
$path ="C:\\blabla\\filesys\\one.txt";
$content = "one for all";
file_put_contents($path,$content);
if (file_exists($path))
{echo "ok";}
else
{echo "ng";}
?>
</body>
</html>
该 PHP 代码示例会创建一个路径为 C:\blabla\filesys\one.txt 的文件，该文件的内容是 one for all 。
PHP 内置函数 file_put_contents 用于追加内容：
如果你想在一个已有文件上追加内容，你也可以使用file_put_contents 函数，只需要加一个参数即可。
当 flags 的值为 FILE_APPEND 时，表示在已有文件上追加内容。即：第三个参数flags实现将内容追加到文件的后面，如果没有这个参数会直接覆盖以前的数据。
比如我们要在上面示例的C:\blabla\filesys\one.txt 文件上追加内容，我们可以这样写：
<html>
<body>
<?php
$path ="C:\\blabla\\filesys\\one.txt";
$content = " all for one";
file_put_contents($path,$content,FILE_APPEND);
if (file_exists($path))
{echo "ok";}
else
{echo "ng";}
?>
</body>
</html>
执行该 PHP 文件之后，我们再看 C:\blabla\filesys\one.txt 文件，发现文件内容增加了，变成了：
one for all all for one
file_put_contents 函数返回写入文件的字节数 (number of bytes) ，如果出错，返回 FALSE。
希望本文所述对大家PHP程序设计有所帮助。
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