I was wondering what is the best way to search keys in an array and return it's value. Something like array_search but for keys. Would a loop be the best way?
Array:
Array([20120425] => 409 [20120426] => 610 [20120427] => 277
[20120428] => 114 [20120429] => 32 [20120430] => 304
[20120501] => 828 [20120502] => 803 [20120503] => 276 [20120504] => 162)
Value I am searching for : 20120504
The key is already the ... ehm ... key
echo $array[20120504];
If you are unsure, if the key exists, test for it
$key = 20120504;
$result = isset($array[$key]) ? $array[$key] : null;
Minor addition:
$result = @$array[$key] ?: null;
One may argue, that @ is bad, but keep it serious: This is more readable and straight forward, isn't?
Update: With PHP7 my previous example is possible without the error-silencer
$result = $array[$key] ?? null;
The key is already the ... ehm ... key - this is really helpful :) In the heat of the moment one can really forget the obvious. Thanks for saving me time!
$result = isset($array[$key]) ? $array[$key] : null;array_search('20120504', array_keys($your_array));
<?php
// Checks if key exists (doesn't care about it's value).
// @link http://php.net/manual/en/function.array-key-exists.php
if (array_key_exists(20120504, $search_array)) {
echo $search_array[20120504];
}
// Checks against NULL
// @link http://php.net/manual/en/function.isset.php
if (isset($search_array[20120504])) {
echo $search_array[20120504];
}
// No warning or error if key doesn't exist plus checks for emptiness.
// @link http://php.net/manual/en/function.empty.php
if (!empty($search_array[20120504])) {
echo $search_array[20120504];
}
?>
Here is an example straight from PHP.net
$a = array(
"one" => 1,
"two" => 2,
"three" => 3,
"seventeen" => 17
);
foreach ($a as $k => $v) {
echo "\$a[$k] => $v.\n";
}
in the foreach you can do a comparison of each key to something that you are looking for
foreach ($a as $k => $v) { if($a[$k] ==='20120504'){ echo "\$a[$k] => $v.\n"; } }For get last value in multidimensional array and order ascending,
function lastvalue($array, $key)
{
$a = array();
for($i = 0; $i < count($array); $i++){
$a[] = $array[$i][$key];
}
sort($a);
return $a[$i-1];
}
$a=array(
array("row" => 2, "column" => 6),
array("row" => 2, "column" => 3),
array("row" => 2, "column" => 7)
);
echo lastvalue($a, "column"); //result = 7
