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：
代码如下:
file_put_contents(filepath,data)
代码如下:
file_put_contents(filepath,data,flags)
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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