Question

I write two file main.php and download.php.

main.php

echo"<form action='download.php' method='post'>"
for(i = 0; i < 10; i++){
    echo"<input type='submit' name='$i'>";
}

In download.php, I want to know which name’s button is pressed? (from 1 to 10 to download the file), so that I can use it in download.php to download file.

I have tried to use $_POST[“$i”] but failed.

What if the $i is a random filename?

Thx!

complete code

main.php:http://codepad.org/4zXPhqFy

Answer 1

Access $_POST via $key => $value in a loop. Exclude other values you know the names of (if you have others).

foreach ($_POST as $key => $value) {
  // Look for form keys not among other known ones
  if (!in_array($key, array('other','known','input','names')) {
    echo "You clicked $key";
  }
}

Or, use ctype_digit() on the post key to determine if it is numeric, excluding any other string keys you may have in there.

foreach ($_POST as $key => $val) {
  if (ctype_digit($key)) {
    echo "You clicked $key";
    // Access it via $_POST[$key]
  }
}

Note that unless you are using HTML5, name attributes must begin with a letter, not a number. If you are using HTML5, anything but an empty string is allowable in the name.