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PHP 文件操作 #14

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suhao opened this issue May 17, 2022 · 0 comments
Open

PHP 文件操作 #14

suhao opened this issue May 17, 2022 · 0 comments

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@suhao
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suhao commented May 17, 2022 •
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在编程中很重要的一部分就是对文件进行操作和读写，PHP也不例外提供了一系列函数来支持。

文件操作

fopen：打开文件

$file = fopen('file.txt', 'r');
  • r: 只读，从文件开头开始
  • r+: 读写，从文件开头开始
  • w: 只写，打开或创建文件，并清空文件内容
  • w+: 读写，打开或创建文件，并清空文件内容
  • a: 追加，打开或创建文件，向文件末尾进行写操作
  • a+: 读+追加，向文件末尾写内容
  • x: 只读，创建新文件，文件已存在返回错误
  • x+: 读写，创建新文件，文件已存在返回错误

fclose：关闭文件

fclose($file);

feof：检测文件末尾

if (feof($file)) echo '文件末尾';

fgets：逐行读取文件

  • 调用函数后，文件指针会下移一行

fgetc：逐字符读取文件

  • 调用函数后，文件指针会移动到下一个字符

文件上传

PHP文件上传，可以实现从客户端到服务器的文件传输。

创建文件上传表单

<!DOCTYPE HTML>
<html>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="file" id="file">
<input type="submit" name="submit" value="提交">
</form>
</body>
</html>

上传脚本

<?php
if ($_FILE['file']['error'] > 0) echo '错误<br>';
else {
  echo $_FILE['file']['temp_name'];
}
?>

保存文件

move_uploaded_file($_FILES['file']['tmp_name'], 'upload/'.$_FILES['file']['name'])
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@suhao