<?php
$txt = isset($_POST[‘text‘])?$_POST[‘text‘]:‘‘;
$path = "./hello/hello.txt";
mkdir("./hello");//创建目录
$handle = fopen($path,"w");//打开文件，不存在则创建
fwrite($handle,$txt);//将内容写到文件中
fclose($handle);//关闭文件
//$reader = fopen($path,"r");
//echo file($reader);
//fclose($reader);
var_dump(file($path,1));
?>
<html>
<form method="post" action="./index.php">
<textarea type="textarea" name="text" rows="5" cols="29"></textarea></br></br>
<button type="submit">提交</button>
</form>
<textarea rows="5" cols="29">
</textarea>
</html>
相关函数http://yige.org/php/ref_filesystem.php
原文：https://www.cnblogs.com/hai-/p/13640287.html