How would you echo the content of a file in php?

Question

So I'm making a whitelist through my own website. I'm using a php to handle a request where it checks if your key matches the whitelisted keys and then echoes. My current code is:

$keys = array(
"Key", "key1");
 
$sub = $_GET["key"];
if (in_array($sub,$keys,TRUE)) {
    echo "Whitelisted"; 
} else {
    echo "Not Whitelisted";
}
?>

Instead of echoing "Whitelisted", I would like to return some text from a file (actually it is a script in some programming language to be executed on client side to make the whitelist more secure, but it does not matter for this question). I have the file in the public html directory and I was wondering if there was a way to call/access/require the entire content of the file. I'm a complete noob with php so if anyone could offer anything I would be very thankful.

https://www.php.net/manual/en/function.file-get-contents.php — ADyson, Nov 28 '21 at 08:44
Does this answer your question? [How can I echo the whole content of a .html file in PHP?](https://stackoverflow.com/questions/9539849/how-can-i-echo-the-whole-content-of-a-html-file-in-php) — Don't Panic, Nov 28 '21 at 09:28

score 0 · Accepted Answer · answered Nov 28 '21 at 09:18

Try something like:

<?php

$whitelistedKeys = array(
    'Key', 'key1'
);
 
$input = $_GET['key'];
if (in_array($input, $whitelistedKeys, TRUE)) {
    echo 'Whitelisted<br>';

    $filePath = __DIR__ . '/my-file.txt';
    echo "Content of \"$filePath\" file is:<br>"; 
    echo file_get_contents($filePath);
} else {
    echo 'Not Whitelisted';
}
?>

Note that I am not using double-quote to improve performance.

And am using __DIR__ to load my-file.txt from same directory which the PHP-script is in.

How would you echo the content of a file in php?

1 Answers1