PHP | fopen( ) (Function open file or URL)

Posted By Bajarangi soft , Posted On 31-12-2020

The fopen() function in PHP is an inbuilt function which is used to open a file or an URL. It is used to bind a resource to a steam using a specific filename. The filename and mode to be checked are sent as parameters to the fopen() function and it returns a file pointer resource if a match is found and a False on failure. The error output can be hidden by adding an ‘@’ in front of the function name.

Syntax:

resource fopen ( $file, $mode, $include_path, $context)

Parameters Used:
The fopen() function in PHP accepts four parameters.

$file: It is a mandatory parameter which specifies the file.
$mode: It is a mandatory parameter which specifies the access type of the file or stream.
It can have the following possible values:
- “r”: It represents Read only. It starts at the beginning of the file.
- “r+”: It represents Read/Write.It starts at the beginning of the file.
- “w”: It represents Write only.It opens and clears the contents of file or create a new file if it doesn’t exist.
- “w+”: It represents Read/Write. It opens and clears the contents of file or creates a new file if it doesn’t exist.
- “a”: It represents Write only. It opens and writes to the end of the file or creates a new file if it doesn’t exist.
- “a+”: It represents Read/Write. It preserves the file’s content by writing to the end of the file.
- “x”: It represents Write only. It creates a new file and returns FALSE and an error if the file already exists.
- “x+”: It represents Read/Write.It creates a new file and returns FALSE and an error if file already exists.
$include_path: It is an optional parameter which is set to 1 if you want to search for the file in the include_path (Ex. php.ini).
$context: It is an optional parameter which is used to set the behavior of the stream.
Return Value:
It returns a file pointer resource on success, or FALSE on error.

Exapmple 1:

<?php
// Opening a file using fopen()
// function in read only mode
$myfile = fopen("/home/gfg.txt", "r")
or die("File does not exist!");
?>

Exapmple 2:

<?php
// Opening a file using fopen()
// function in read/write mode
$myfile = fopen("gfg.txt", 'r')
or die("File does not exist!");

$pointer = fgets($myfile);
echo $pointer;
fclose($myfile);
?>

Exapmple 3:

<?php
// Opening a file using fopen() function
// in read/write mode
$myfile = fopen("gfg.txt", "w+");

// writing to file
fwrite($myfile, 'geeksforgeeks');

// Setting the file pointer to 0th
// position using rewind() function
rewind($myfile);

// writing to file on 0th position
fwrite($myfile, 'geeksportal');
rewind($myfile);

// displaying the contents of the file
echo frea<?php
// Opening a file using fopen() function
// in read/write mode
$myfile = fopen("gfg.txt", "w+");

// writing to file
fwrite($myfile, 'geeksforgeeks');

// Setting the file pointer to 0th
// position using rewind() function
rewind($myfile);

// writing to file on 0th position
fwrite($myfile, 'geeksportal');
rewind($myfile);

// displaying the contents of the file
echo fread($myfile, filesize("gfg.txt"));
fclose($myfile);
?>

d($myfile, filesize("gfg.txt"));
fclose($myfile);
?>

Exapmple 4:

<?php
// Opening a file using fopen() function
// in read/write mode
$myfile = fopen("gfg.txt", "w+");

// writing to file
fwrite($myfile, 'companywebdsi=te');

// Setting the file pointer to 0th
// position using rewind() function
rewind($myfile);

// writing to file on 0th position
fwrite($myfile, 'company website');
rewind($myfile);

// displaying the contents of the file
echo fread($myfile, filesize("gfg.txt"));
fclose($myfile);
?>

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