I have the following 2D array and I would like to get the key of the smalest value in the [0]
column if done
is equal to no
$graph= array(
"CityA" => array(
"0" => "1",
"1" => "CityC",
"done" => "no",
),
"CityB" => array(
"0" => "4",
"1" => "CityA",
"done" => "no",
),
"CityC" => array(
"0" => "5",
"1" => "CityA",
"done" => "no",
),
);
Try this,
$arr = array_map(function($v){return $v[0];}, $graph);
$key = array_keys($arr, min($arr));
Here you go.
$tes = min( array_column( $graph, 0 ) );
$key = array_search( $tes, array_column( $graph, 0 ) );
$array_keys = array_keys($graph);
echo $array_keys[$key];
You should perform all of your checks in a single pass through your array.
My snippet will provide the first qualifying (contains the lowest [0]
value AND has a done
value of no
) row's key.
Code: ( Demo )
$graph = [
"CityB" => ["0" => "1", "1" => "CityA", "done" => "no"],
"CityA" => ["0" => "1", "1" => "CityC", "done" => "no"],
"CityD" => ["0" => "1", "1" => "CityD", "done" => "yes"],
"CityC" => ["0" => "5", "1" => "CityA", "done" => "no"]
];
$result = [];
foreach ($graph as $key => $row) {
if ($row['done'] === 'no' && (!isset($result[$key]) || $row[0] < $result[$key])) {
$result[$key] = $row[0];
}
}
echo key($result) ?? 'No "done => no" rows';
Output:
CityB
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