What is the usage of fopen function in php

The usage of fopen function in php is "fopen(filename, mode, include_path, context)". The fopen() function is used to open a file or URL. If it fails, it returns false with an error message.

The operating environment of this article: windows10 system, php7, thinkpad t480 computer.

Let’s first take a brief look at the definition and return value of the fopen() function.

The fopen() function is used to open a file or URL. If the fopen() function fails to open, it will return FALSE with an error message. Of course, we can hide the error output by adding a '@' in front of the function name.

Next let’s take a look at its syntax:

fopen(filename,mode,include_path,context)

Parameter introduction:

filename: Specifies the file or URL to be opened.
mode: Specifies the type of access required to the file/stream.
include_path: Optional, if you also need to retrieve files in include_path, you can set this parameter to 1 or TRUE.
context: Optional, specifies the environment of the file handle. Context is a set of options that can modify the behavior of the stream.

Finally let us take a look at an example of using the fopen() function:

<?php
$file = fopen("test.txt","r");
$file = fopen("/home/test/test.txt","r");
$file = fopen("/home/test/test.gif","wb");
$file = fopen("http://www.example.com/","r");
$file = fopen("ftp://user:password@example.com/test.txt","w");
?>

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