How to select the first element in a multidimensional array?

Question

I have the following array:

$extensions = array(
    '.info'     => array('whois.afilias.net','NOT FOUND'),  
    '.com'      => array('whois.verisign-grs.com','No match for'),
    '.net'      => array('whois.crsnic.net','No match for'),
    '.co.uk'    => array('whois.nic.uk','No match'),        
    '.nl'       => array('whois.domain-registry.nl','is free'),
);

How do I echo the '.com' or '.co.uk' (not the array that is inside the '.com' or '.co.uk', but just the TLD) without a foreach loop. echo $extensions['.com']; doesn't work, because that gives back: Array

EDIT: I want to select on the key itself not on the array number. Is this possible?

Thanks in advance!

Answer 1

print_r(array_keys($extensions));

Answer 2

php 5.4
echo array_keys($extensions)[0];

php 5.3
$keys = array_keys($extensions); echo $keys[0];

Answer 3

if you want to just for 1 output

$arrext = array_keys($extensions);
print_r($arrext[0]);

Answer 4

To echo the key is only necessary if they are unknowned. If you know the key, like you described in your question with: "echo $extensions['.com'];" you are probably better of just trying: echo ".com";

BUT if you don't know them and want to output for example the first one you could do like this:

<?php
$extensions = array(
    '.info'     => array('whois.afilias.net','NOT FOUND'),
    '.com'      => array('whois.verisign-grs.com','No match for'),
    '.net'      => array('whois.crsnic.net','No match for'),
    '.co.uk'    => array('whois.nic.uk','No match'),
    '.nl'       => array('whois.domain-registry.nl','is free'),
);
$keys = array_keys($extensions);
echo $keys[0]; //will output ".info"
?>