array_diff (arr1, arr2 …)
array_filter (arr, function)
array_flip (arr)
array_intersect (arr1, arr2 …)
array_merge (arr1, arr2 …)
array_pop (arr)
array_push (arr, var1, var2 …)
array_reverse (arr)
array_search (needle, arr)
array_walk (arr, function)
count (count)
in_array (needle, haystack)
crypt (str, salt)
explode (sep, str)
implode (glue, arr)
nl2br (str)
sprintf (frmt, args)
strip_tags (str, allowed_tags)
str_replace (search, replace, str)
strpos (str, needle)
strrev (str)
strstr (str, needle)
strtolower (str)
strtoupper (str)
substr (string, start, len)