How to print array keys like $ _POST in PHP?

Question

Perhaps the code looks something like this:

foreach(...$POST){
echo $key."<br/>;
}

Answer 1

var_dump($_POST);

or

print_r($_POST);

You can insert a preliminary tag before and after for clearer output in your browser:

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

And I suggest using Xdebug . It provides an enchanted var_dump that works without prior.

Answer 2

See the PHP documentation for foreach: http://php.net/manual/en/control-structures.foreach.php

Your code will look something like this:

foreach ($_POST as $key=>$element) {
   echo $key."<br/>";
}

Answer 3

:

echo join('<br />',array_keys($_POST));

Answer 4

- (, ), :

foreach ($_POST as $k => $v) {
  echo $k . "<br>";
}

print_r($_POST);

var_dump($_POST);

Answer 5

, print_r var_dump

Answer 6

$array = array_flip($array);
echo implode('any glue between array keys',$array);

Answer 7

Or you can just print the keys of the array:

foreach (array_keys($_POST) as $key) {
    echo "$key<br/>\n";
}

Answer 8

Normally I would use print_r($_POST).

If you are using an HTML page, it might be worth wrapping the tag <pre>to get a more convenient output, otherwise useful tabs and line breaks are displayed only in their original form.

print_r () in PHP.net