I want to make a php page that recieves post requests and writes the data to a file, the below isn't working

Question

Here is the code, I always have the $data variable set to "" as the requests aren't received properly:

<?php
echo"<h1>J_server</h1>";
//receive requests
$data = htmlspecialchars($_POST["incoming_data"] ?? "");
//if not received properly it's defined as ""
if($data != ""){
    if(file_exists("data.log")){
        $file = fopen("data.log","a");
    }else{
        $file = fopen("data.log","w");
    }
    fwrite($file,$data."\n");
    fclose($file);
}else{
    if(file_exists("data.log")){
        $file = fopen("data.log","a");
    }else{
        $file = fopen("data.log","w");
    }
    fwrite($file,"Error in recieving data!!!\n");
    fclose($file);
}
?>

here is the request code:

Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) 
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import requests
>>> requests.post("http://localhost/j_server/server.php",data={"incoming_data":"Hello world!"})
<Response [200]>

Add some more information to your answer. What error do you get? Do you get data? If yes? Does your condition run? Try to debug and add information here. Thanks — Maihan Nijat, May 25 '18 at 19:41
I don't get an error it's just not receiving the request so it sets data to "", without the part of code that reassigns the variable i get a undefined index error — John Smith, May 25 '18 at 19:50
Add the form/ post or submitting code block as the problem might be there. You are not getting $data, maybe you are not posting properly. — Maihan Nijat, May 25 '18 at 19:52
FYI, you can replace all that code with `file_put_contents("data.log", $data, FILE_APPEND);` — Barmar, May 25 '18 at 20:02
@JohnSmith in Python change the `data={"incoming_data":"Hello world!"} ` to `params={"incoming_data":"Hello world!"} ` and then instead of `$_POST` use `$_GET` — Maihan Nijat, May 25 '18 at 20:20
Try using `$_GET` and putting the variable in the query string `?incoming_data=helloworld`. Does that work? — Cobolt, May 25 '18 at 20:26
Use this to check if there is a post variable set: `if ( isset ( $_POST ["incoming_data"] ) ) {` — Raffi, May 26 '18 at 00:09

score 0 · Answer 1 · answered May 26 '18 at 00:21

0

This seems to work for me:

<?php

    echo "<h1>Server</h1>";

    if ( isset ( $_POST ["incoming_data"] ) ) {
        $sanitized = htmlspecialchars ( $_POST ["incoming_data"] );
        file_put_contents ( "data.log", $sanitized . "\n", FILE_APPEND );
    }

?>

answered May 26 '18 at 00:21

Raffi

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It's still not working, I think it is something to do with receiving the data rather than processing it but I don't know what it is – John Smith May 26 '18 at 09:10
I don't think the code executes because the post request isn't set – John Smith May 26 '18 at 09:11
I just tested using python and requests the same way that you do and it worked for me. This could be a permission issue. https://stackoverflow.com/a/49566838/885475 – Raffi May 26 '18 at 13:10

I want to make a php page that recieves post requests and writes the data to a file, the below isn't working

1 Answers1