无法检索$ _POST ['files'']的整数值

Question

PHP script portion : (getting "files = 4" from cpp file):

$downloaded_files = $_POST['files'];
echo($downloaded_files);
$start = $downloaded_files+2;  

The problem is echo($downloaded_files) is working and shows value as "4" in cpp file but $start is always 2.

How do I use value of $_POST['files'] in my program.

Answer 1

I'll explain a couple of differences between echo, var_dump and array's.

Example echo's

$test = 'Hello, I am a test';
$second_test = 'Hi! I am a second test';

echo $test; // displays: Hello, I am a test
echo $second_test; // displays: Hi! I am a second test

echo $test . ' --- ' . $second_test; // displays: Hello, I am a test --- Hi! I am a second test

Echo's are being used to display a single item.

Documentation:

http://php.net/manual/en/function.echo.php

---

Examples var_dump's and array's

$test        = 'Hello, I am a string';
$second_test = [
    'one'   => 'Wassup', // outcome: Wassup
    'two'   => $test, // outcome: Hello, I am a string
    'three' => (1 + 2) // outcome: 3
];
$third_test  = [
    $fourth_test = [
        'sup' => $second_test['two'], // outcome: Hello I am a string
    ],
];
echo '<pre>';
var_dump($test);
echo '</pre>';
//displays:
//string(20) "Hello, I am a string"

echo '<pre>';
var_dump($second_test);
echo '</pre>';
// displays:
//array(3) {
//  ["one"]=>
//  string(6) "Wassup"
//  ["two"]=>
//  string(20) "Hello, I am a string"
//  ["three"]=>
//  int(3)
//}

echo '<pre>';
var_dump($third_test);
echo '</pre>';
// displays:
//array(1) {
//  [0]=>
//  array(1) {
//      ["sup"]=>
//    string(20) "Hello, I am a string"
//  }
//}

Documentation:

http://php.net/manual/en/function.var-dump.php

So related to what you need

Please use this code to see what the outcome is:

echo '<pre>';
var_dump($_POST['files']);
echo '</pre>';

If the outcome is an array, you can look at the second example on how to display the results.

I hope this will give you an idea on how to handle your $_POST['files'].

I will update my answer meanwhile.

Edit #1:

$downloaded_files = $_POST['files'];
echo($downloaded_files);
$start = $downloaded_files+2;  

Change it to: (note: there are a couple of other ways to get the same result. But I would like to see what happens).

$downloaded_files = $_POST['files'];
$start            = ($downloaded_files + 2);

You could also do a var_dump($_POST), to see how many and which items are inside $_POST.

Edit #2: Please use the following code:

echo '<pre>';
var_dump($_POST);
echo '</pre>';

I need to know what is inside your $_POST.