Method has_index()

Method has_index

int has_index(string haystack, int index)
int has_index(array haystack, int index)
int has_index(mapping|multiset|object|program haystack, mixed index)


Search for index in haystack.


Returns 1 if index is in the index domain of haystack, or 0 (zero) if not found.

This function is equivalent to (but sometimes faster than):

search(indices(haystack), index) != -1

A negative index in strings and arrays as recognized by the index operators `[]() and `[]=() is not considered a proper index by has_index()

See also

has_value(), has_prefix(), has_suffix(), indices(), search(), values(), zero_type()