file_get_contents() to read file in PHP

Read a complete file into a string

file_get_contents() is the simplest choice when the entire file can comfortably fit in memory. It returns false on failure, so use a strict comparison before working with the result.

$file = __DIR__ . '/data.txt';
$content = file_get_contents($file);
if ($content !== false) {
    echo nl2br(htmlspecialchars($content));
}

The examples below show additional variations and practical file-handling cases.

$str="my_file.txt"; // Change the path ( end of this page copy the file ) 
echo file_get_contents($str,1,null,0,120);

Output is here

Welcome to plus2net, Read PHP section here

file_get_contents return the output of a file as a string.

file_get_contents($filename, $useIncludePath = false, $context = null, $offset = 0, $length = null);

path:

Required path to the file.

include_p:

Use FILE_USE_INCLUDE_PATH constant.

context:

A valid context resource

offset:

Starting point for reading, negative value means starting from end of file.

length:

Maximum length of data read

URL ( localhost) to get content

We will keep our function in one main file and try to read another file by sending request.
In second file we will keep minimum code to just return a welcome message with name. From our main file we will send the name by using GET method.

Here is a sample code to get output content from a file. While sending the request we will send name variable and try to get the welcome message with the name. We have used localhost for this. You should use your host or path in this code.

$v1=urlencode('Alex John');
$str="http://127.0.0.1/t/file/file_get_contents-demo.php?name=$v1";
echo $str;
echo "<hr>";
echo file_get_contents($str,1,null,0,20);

Here is the second file where we will read the output file_get_contents-demo.php.

<?Php
$v1 = filter_input(INPUT_GET, 'name', FILTER_UNSAFE_RAW) ?? '';
echo 'Welcome ' . htmlspecialchars($v1, ENT_QUOTES, 'UTF-8');
?>

Output: here we are not getting the source code , only the output as returned by the browser is read as string and displayed.

Welcome Alex John

You can change the output by changing the start and max_length optional parameters of the function.

Getting external URL content

file_get_contents() can fetch remote URLs when URL wrappers are enabled. Do not pass an arbitrary user-supplied URL: that can create SSRF exposure to internal hosts or cloud metadata services. Prefer a fixed/allowlisted destination and keep TLS verification enabled.

my_file.txt

Welcome to plus2net 
Read PHP section here

Getting mututal fund NAV data

This optimized PHP script leverages the MFAPI service to fetch real-time Mutual Fund NAV data with high precision. Unlike traditional methods that require parsing massive text files from AMFI, this approach uses a targeted API call to retrieve a specific scheme's details in JSON format. This drastically reduces bandwidth usage and server-side processing time, making it the perfect solution for performance-critical applications like live investment trackers or financial blog widgets.

<?php
// Set the specific AMFI scheme code
$schemeCode = "120847";
$apiUrl = "https://api.mfapi.in/mf/" . $schemeCode . "/latest";

// Use the default HTTPS verification. Add a timeout for the request.
$context = stream_context_create([
    'http' => ['timeout' => 10],
]);

// Fetch the JSON response
$jsonResponse = file_get_contents($apiUrl, false, $context);
$data = json_decode($jsonResponse, true);

if (isset($data['data'][0]['nav'])) {
    $fundName = $data['meta']['scheme_name'];
    $navValue = $data['data'][0]['nav'];
    $navDate  = $data['data'][0]['date'];

    echo "Fund: " . $fundName . " | NAV: " . $navValue . " (as of " . $navDate . ")";
} else {
    echo "Error: Scheme data not found.";
}
?>

Reading external url by curl Reading a file by fread()

File Directory Functions
PHP

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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file_get_contents(): Reading file into a string

Read a complete file into a string

URL ( localhost) to get content

Getting external URL content

Getting mututal fund NAV data

Subhendu Mohapatra