/    Sign up×
Community /Pin to ProfileBookmark

Do Array Keys Have To Be Unique ?

Folks,

Why can’t array keys be duplicates while values unique ? Duplicate keys for grouping purpose.
Based on following test, keys must be unique
Test this code on your ends.

[code]
<?php

$array_duplicates_1 = array(‘personal’ => ’email’,’commercial’ => ’email’);
$array_duplicates_2 = array(‘personal’ => ’email’,’personal’ => ‘domain’);
$array_duplicates_3 = array(‘personal’ =>’email’,’commercial’ =>’domain’);

print_r($array_duplicates_1);
echo ‘<br>’;
print_r($array_duplicates_2);
echo ‘<br>’;
print_r($array_duplicates_3);
echo ‘<br>’;

$array_non_duplicates_1 = array_unique($array_duplicates_1);
$array_non_duplicates_2 = array_unique($array_duplicates_2);
$array_non_duplicates_3 = array_unique($array_duplicates_3);

print_r($array_non_duplicates_1);
echo ‘<br>’;
print_r($array_non_duplicates_2);
echo ‘<br>’;
print_r($array_non_duplicates_3);
echo ‘<br>’;

?>
[/code]

to post a comment
PHP

0Be the first to comment 😎

×

Success!

Help @developer_web spread the word by sharing this article on Twitter...

Tweet This
Sign in
Forgot password?
Sign in with TwitchSign in with GithubCreate Account
about: ({
version: 0.1.9 BETA 3.3,
whats_new: community page,
up_next: more Davinci•003 tasks,
coming_soon: events calendar,
social: @webDeveloperHQ
});

legal: ({
terms: of use,
privacy: policy
});
changelog: (
version: 0.1.9,
notes: added community page

version: 0.1.8,
notes: added Davinci•003

version: 0.1.7,
notes: upvote answers to bounties

version: 0.1.6,
notes: article editor refresh
)...
recent_tips: (
tipper: @darkwebsites540,
tipped: article
amount: 10 SATS,

tipper: @Samric24,
tipped: article
amount: 1000 SATS,

tipper: Anonymous,
tipped: article
amount: 10 SATS,
)...