What PHP functions are available for file operations?

PHP provides the following file operation functions: Open a file: fopen (file path, mode) Read a file: fread (file handle, number of bytes), fgets (file handle) Write a file: fwrite (file handle, new content )Close the file: fclose(file handle)

PHP File Operation Function Guide

PHP provides a series of functions that can help You perform various file operations. This guide will introduce you to these functions and provide some practical examples to show how to use them.

Open a file

To open a file, use fopen() Function:

$handle = fopen("myfile.txt", "r");

This function returns a file handle , for subsequent operations. The first argument is the file path, and the second argument is the mode, such as "r" (read), "w" (write), or "a" (append).

Reading a file

To read a file, use the fread() or fgets() function:

$content = fread($handle, 1024); // 读取 1024 字节
$line = fgets($handle); // 读取一行

Write to File

To write to a file, use fwrite() Function:

fwrite($handle, "新内容");

Close File

After the operation is completed, be sure to close the file:

fclose($handle);

Practical case

Read a file

$handle = fopen("myfile.txt", "r");
$content = fread($handle, filesize("myfile.txt"));
fclose($handle);

echo $content;

Write a file

$handle = fopen("myfile.txt", "w");
fwrite($handle, "新内容");
fclose($handle);

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