What are the potential reasons for the warning message "in_array() expects parameter 2 to be array, null given" in PHP and how can it be resolved?

The warning message "in_array() expects parameter 2 to be array, null given" in PHP occurs when the second parameter provided to the in_array function is not an array but is instead null. To resolve this issue, you need to ensure that the second parameter passed to in_array is an array. 

// Check if the array is null before passing it to in_array
$array = null;
if(is_array($array)) {
    if(in_array($value, $array)) {
        // Value is in the array
    } else {
        // Value is not in the array
    }
} else {
    // Handle the case where the array is null
}

Keywords

in_array parameter array null resolution

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