ACRA Insert report into my server's database

Question

I successfully configured ACRA to send my caught exceptions to my server, the problem is I can't insert the report into the database:

@AcraCore(buildConfigClass = BuildConfig.class)
@AcraHttpSender(uri = "http://www.myserver.com/crashreports/addreport.php",
        httpMethod = HttpSender.Method.POST)

public class MyApplication extends Application {
    @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);

        ACRA.init(this);
    }
}

I know it sends somethings because I see an empty entry in my phpMyAdmin, but I can't get the report inside the database:

<?php
$link = mysqli_connect("localhost", "root", "pass", "db");

// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}

// Escape user inputs for security
$report = mysqli_real_escape_string($link, $_REQUEST['']);

// attempt insert query execution
$sql = "INSERT INTO VoiceRemoteCrash (report) VALUES ('$report')";

if(mysqli_query($link, $sql)){
    echo "Records added successfully.";
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}

// close connection
mysqli_close($link);
?>

I've searched docs, but didn't find much info, and my PHP knowledge is somewhat basic.

Answer 1

$_REQUEST[''] will returns NULL and will throw an "undefined index" notice.

You could get your report from POST raw data using file_get_contents('php://input').

I suggest you to have a look to : How can I prevent SQL injection in PHP? and use parameterized queries.