How can I access all variables from a POST request in PHP?

Getting All POST Variables

Question:

How do I access all variables sent through a POST request?

Answer:

The $_POST global variable automatically stores all POST data. To view its contents:

var_dump($_POST);

Individual values can be accessed like this:

$name = $_POST["name"];

Handling Non-Standard POST Data

If the POST data is in a format other than multipart/form-data, such as JSON or XML:

$post = file_get_contents('php://input');

This will contain the raw data.

Checking Checkbox Values

To test if a checkbox is checked (assuming standard $_POST usage):

if(isset($_POST['myCheckbox']) && $_POST['myCheckbox'] == 'Yes')
{
     ...
}

Handling Checkbox Arrays

If you have an array of checkboxes:

  <input type="checkbox" name="myCheckbox[]" value="A" />val1<br />
  <input type="checkbox" name="myCheckbox[]" value="B" />val2<br />
  <input type="checkbox" name="myCheckbox[]" value="C" />val3<br />

$_POST['myCheckbox'] will be an array containing the checked values.

Example:

  $myboxes = $_POST['myCheckbox'];
  if(empty($myboxes))
  {
    echo("You didn't select any boxes.");
  }
  else
  {
    $i = count($myboxes);
    echo("You selected $i box(es): <br>");
    for($j = 0; $j < $i; $j++)
    {
      echo $myboxes[$j] . "<br>";
    }
  }

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