How can array_key_exists be used to prevent errors related to undefined offsets in PHP arrays?

When accessing array elements in PHP, there may be cases where you try to access an index that does not exist, leading to an "undefined offset" error. To prevent this error, you can use the `array_key_exists` function to check if a specific key exists in the array before trying to access it. This helps ensure that you only access keys that actually exist in the array, preventing errors related to undefined offsets. 

// Example of using array_key_exists to prevent errors related to undefined offsets
$array = ['key1' => 'value1', 'key2' => 'value2'];

if (array_key_exists('key1', $array)) {
    echo $array['key1']; // Output: value1
}

if (array_key_exists('key3', $array)) {
    echo $array['key3']; // This line will not be executed as 'key3' does not exist in the array
}

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