PHP Check if Array Key Exists: Complete Guide

1 year ago
Liam
1 minute

In PHP, the function array_key_exists() can be used to determine if a key exists in an array. An example is shown below:

$array = array("name" => "John", "age" => 30, "city" => "New York");

if (array_key_exists("name", $array)) {
    echo "Key 'name' exists in the array";
} else {
    echo "Key 'name' does not exist in the array";
}

Additionally, you can use the isset() function to check if a key exists in an array. An example is shown below:

$array = array("name" => "John", "age" => 30, "city" => "New York");

if (isset($array["name"])) {
    echo "Key 'name' exists in the array";
} else {
    echo "Key 'name' does not exist in the array";
}

The difference between array_key_exists() and isset() functions is that isset() returns true only when the key exists and its corresponding value is not null, whereas array_key_exists() only checks if the key exists.

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