Add to an array only if a variable is set [duplicate] - php

Question

This question already has answers here:
PHP - Checking if array index exist or is null [duplicate]
(3 answers)
Closed 8 years ago.
I have this array I'm doing like so:
Turns out some of those var aren't always set which cause undefined index issues when trying to inserting it into the db?
Is there a quick way to check each value is set before adding it to the array?
$show_insert = array(
'title' => $show_data['title'],
'thetvdb_id' => $show_data['tvdbid'],
'release_date' => $show_data['FirstAired'],
'lastupdatethetvdb' => $show_data['lastupdatethetvdb'],
'moviedb_id' => $show_data['moviedb_id'],
'imdb_id' => $show_data['IMDB_ID'],
'img_id' => $show_data['tvdbid'],
'media_type' => 1,
'status' => $show_data['status'],
'length' => $show_data['runtime'],
'network' => $show_data['network'],
'overview' => $show_data['overview'],
'seasons' => $show_data['seasons'],
'episodes' => $show_data['episodes'],
'homepage' => $show_data['homepage'],
'last_airdate' => $show_data['last_air_date'],
'vote_average' => $show_data['vote_average']
);

Answer 1

You can use the ternary operator and isset(). We're checking if the variable and key are set (the part before ?). If it is set, use that variable (the part between ? and :) and if not, set to blank (the part after :).
Ternary operator works like:
$variable = ( comparison ? if true : if false );
Thus:
$show_insert = array(
'title' => ( isset( $show_data['title'] ) ? $show_data['title'] : '' ),
'thetvdb_id' => ( isset( $show_data['tvdbid'] ) ? $show_data['tvdbid'] : '' ),
[etc.]
);

Answer 2

if (isset($show_data['title']) {
$show_insert[title] = $show_data['title'];
}
This basically means that if $show_data[title] has been initialized then it will add it to the $show_insert array under the key 'title', if it has not been set, nothing will happen so there will be no array key 'title'
or for large arrays you could have:
public function check_set($array, $variable = null, $key_name)
if ($variable != null) {
$array[$key_name] = $variable;
}
check_set($show_insert, $show_data[title], $title = '"title"');

Answer 3

Expanding on the other answer:
I would use a function to simplify all that typing, also, I would use empty() instead of isset() but if you're just setting it to an empty string I suppose that part doesn't matter much.
function checkVal($val, $show_data){
return empty($show_data[$val]) ? "" : $show_data[$val];
}
$show_insert = array(
'title' => checkVal('title',$show_data),
'thetvdb_id' => checkVal('tvdbid',$show_data)
);