Hi guys! I just want to ask something very basic. I need to print some array keys on the screen. The only way to print an array I know is print_r(). But that prints the array along with the word Array and all numeric indexes. I just need the keys.
Example:

<?php
$states = array("US" => "Washington","AU" => "Canberra","UK" => "London");
$keys = array_keys($states);
print_r($keys);
?>

This would output:
Array ( [0] => US [1] => AU [2] => UK )

But I want the output to look like this:
US, AU, UK

How can it be done?

Use a foreach loop to loop through the array

PHP Code:

<?php 
$states = array("US" => "Washington","AU" => "Canberra","UK" => "London");
foreach($states as $key => $value){
echo $key.",";
}?>

Alternative using array_keys and implode

PHP Code:

<?php 
$states = array("US" => "Washington","AU" => "Canberra","UK" => "London");
$keys=array_keys($states);
echo implode(",",$keys);
?>

Thank you, that worked great! I’m still learning and I haven’t gotten to creating loops yet. I’m doing arrays now and I couldn’t concentrate unless I knew how to output an array the way I want. I know implode and explode from saving into and reading from a file, but it didn’t occur to me as a solution to my problem.

Thank you again. Added talkupation.