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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,
];
  
// Get a specific value by index
$firstItem = $mixedArr[0];
echo "An item by index 0: {$firstItem}\n";
  
// Get a specific value by string key
$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];
  
// Check the key existence with 
// the built-in 'isset' function
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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