/// <summary>
/// Inserts specified items before the first item of an array and reindex integer keys starting from zero.
/// </summary>
/// <param name="array">The array to be unshifted.</param>
/// <param name="vars">Variables to be inserted.</param>
/// <returns>The number of items in resulting array.</returns>
public static int array_unshift(PhpArray array, params PhpValue[] vars)
{
if (array == null)
{
//PhpException.ReferenceNull("array");
//return 0;
throw new ArgumentNullException();
}
// reindexes integer keys starting from the number of items to be prepended:
array.ReindexIntegers(vars.Length);
// prepends items indexing keys from 0 to the number of items - 1:
for (int i = vars.Length - 1; i >= 0; i--)
{
array.Prepend(i, vars[i]);
}
return array.Count;
}
/// <summary>
/// Removes the first item of an array and reindex integer keys starting from zero.
/// </summary>
/// <param name="array">The array to be shifted.</param>
/// <returns>The removed object.</returns>
/// <remarks>Resets intrinsic enumerator.</remarks>
public static PhpValue array_shift(PhpArray array)
{
if (array == null)
{
//PhpException.ReferenceNull("array");
//return null;
throw new ArgumentNullException();
}
if (array.Count == 0) return PhpValue.Null;
// dereferences result since the array doesn't do so:
var result = array.RemoveFirst().Value; // TODO: PhpVariable.Dereference
// reindexes integer keys starting from zero:
array.ReindexIntegers(0);
array.RestartIntrinsicEnumerator();
return result;
}