How to get specific key value from array in PHP ?
Last Updated :
22 Nov, 2021
In this article, we will see how to get specific key values from the given array. PHP array is a collection of items that are stored under keys. There are two possible types of keys: strings and integers. For any type of key, there is a common syntax to get a specific value by key — square brackets.
Example 1:
PHP
<?php
$mixedArr = [
10,
20,
'hello' => 'world',
30,
];
$firstItem = $mixedArr[0];
echo "An item by index 0: {$firstItem}\n";
$stringItem = $mixedArr['hello'];
echo "An item by key 'hello': {$stringItem}\n";
?>
|
Output
An item by index 0: 10
An item by key 'hello': world
Example 2: Sometimes we can accidentally try to get a non-existent item from the array. In this case, PHP throws a NOTICE. To avoid the issue, we have to check the key existence before accessing it.
PHP
<?php
$arr = [1, 2, 3];
if (isset($arr[10])) {
echo "index 10 value is: {$arr[10]}\n";
} else {
echo "There are no value under the index 10\n";
}
$value = $arr[10] ?? 'unknown';
echo "A value under the index 10: {$value}\n";
?>
|
Output
There are no value under the index 10
A value under the index 10: unknown
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