What are best practices for checking if a value exists in an array in PHP?

To check if a value exists in an array in PHP, you can use the in_array() function. This function checks if a specified value exists in an array and returns true if the value is found, and false otherwise. It is a simple and efficient way to determine if a certain value is present in an array.

// Array to check
$array = [1, 2, 3, 4, 5];

// Value to check
$value = 3;

// Check if value exists in the array
if (in_array($value, $array)) {
    echo "Value exists in the array.";
} else {
    echo "Value does not exist in the array.";
}