array_key_exists()
18th January 2021
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Programming Language
PHP [Versions: 4 >= 4.0.7, 5, 7, 8]
Syntax
Typical Usage
Checks if a key or index exists in a PHP array.
Accepted Parameters
- key (string or integer) (Required): The key or index to look for.
- array (array) (Required): The array you wish to check.
Return Value(s)
Returns true on success or false on failure.Notes
array_key_exists() will only search the first dimension of multidimensional arrays.
Examples of array_key_exists()
Example 1
<?php
$cats = array('lions' => 5, 'tigers' => 4, 'leopards' => '8');
if (array_key_exists('tigers', $cats)) {
echo 'This zoo has ' . $cats['tigers'] . ' tigers.';
}The above will output “This zoo has 4 tigers.” because the $cats array does have a ‘tigers’ key.
Used In Projects
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