NAME
    member_array - find the position of an element in an array

    SYNOPSIS
    int member_array(mixed element, mixed *array)

    DESCRIPTION
    Gives the index in 'array' which is occupied with the value 'element'. If 'element' is not found or an integer is given instead of an array as second argument, -1 is returned.

    Searching works like the equality operator, ie integers and strings are compared for equality and arrays and mappings for identity.

    This means that integers and strings must have the same value to match, while arrays and mappings must be the exactly same.