Appendix. Function Reference
This appendix describes the functions available in the built-in PHP extensions. These are the extensions that PHP is built with if you provide no --with or --enable options to configure, and they cannot be removed via configuration options.
For each function, we’ve provided the function signature, showing the data types of the various arguments and which are mandatory or optional, as well as a brief description of the side effects, errors, and returned data structures.
PHP Functions by Category
This section gives a list of functions provided by PHP’s built-in extensions, grouped by extension category.
Arrays
array_change_key_case
array_chunk
array_combine
array_count_values
array_diff
array_diff_assoc
array_diff_key
array_diff_uassoc
array_diff_ukey
array_fill
array_fill_keys
array_filter
array_flip
array_intersect
array_intersect_assoc
array_intersect_key
array_intersect_uassoc
array_intersect_ukey
array_key_exists
array_keys
array_map
array_merge
array_merge_recursive
array_multisort
array_pad
array_pop
array_product
array_push
array_rand
array_reduce
array_replace
array_replace_recursive
array_reverse
array_search
array_shift
array_slice
array_splice
array_sum
array_udiff
array_udiff_assoc
array_udiff_uassoc
array_uintersect
array_uintersect_assoc
array_uintersect_uassoc
array_unique
array_unshift
array_values
array_walk
array_walk_recursive
arsort
asort
compact
count
current
each
end
extract
in_array
is_countable
key
krsort
ksort
list
natcasesort ...
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