PHP Basics


1.PHP Array Functions
Function       Description PHP
array()                  Creates an array               3
array_change_key_case()           Returns an array with all keys in lowercase or uppercase               4
array_chunk()                   Splits an array into chunks of arrays         4
array_combine()              Creates an array by using one array for keys and another for its values   5
array_count_values()    Returns an array with the number of occurrences for each value               4
array_diff()        Compares array values, and returns the differences        4
array_diff_assoc()           Compares array keys and values, and returns the differences     4
array_diff_key()                     Compares array keys, and returns the differences    5
array_diff_uassoc()        Compares array keys and values, with an additional user-made function check, and returns the differences         5
array_diff_ukey()            Compares array keys, with an additional user-made function check, and returns the differences                5
array_fill()          Fills an array with values               4
array_filter()     Filters elements of an array using a user-made function                4
array_flip()         Exchanges all keys with their associated values in an array            4
array_intersect()             Compares array values, and returns the matches              4
array_intersect_assoc()                    Compares array keys and values, and returns the matches       4
array_intersect_key()   Compares array keys, and returns the matches 5
array_intersect_uassoc()             Compares array keys and values, with an additional user-made function check, and returns the matches       5
array_intersect_ukey() Compares array keys, with an additional user-made function check, and returns the matches     5
array_key_exists()          Checks if the specified key exists in the array      4
array_keys()      Returns all the keys of an array  4
array_map()       Sends each value of an array to a user-made function, which returns new values              4
array_merge()  Merges one or more arrays into one array           4
array_merge_recursive()             Merges one or more arrays into one array           4
array_multisort()             Sorts multiple or multi-dimensional arrays            4
array_pad()        Inserts a specified number of items, with a specified value, to an array  4
array_pop()        Deletes the last element of an array       4
array_product()                Calculates the product of the values in an array 5
array_push()      Inserts one or more elements to the end of an array      4
array_rand()      Returns one or more random keys from an array              4
array_reduce() Returns an array as a string, using a user-defined function           4
array_reverse()                               Returns an array in the reverse order     4
array_search()  Searches an array for a given value and returns the key 4
array_shift()      Removes the first element from an array, and returns the value of the removed element            4
array_slice()      Returns selected parts of an array            4
array_splice()    Removes and replaces specified elements of an array    4
array_sum()       Returns the sum of the values in an array             4
array_udiff()      Compares array values in a user-made function and returns an array       5
array_udiff_assoc()        Compares array keys, and compares array values in a user-made function, and returns an array 5
array_udiff_uassoc()     Compares array keys and array values in user-made functions, and returns an array        5
array_uintersect()           Compares array values in a user-made function and returns an array       5
array_uintersect_assoc()             Compares array keys, and compares array values in a user-made function, and returns an array      5
array_uintersect_uassoc()          Compares array keys and array values in user-made functions, and returns an array        5
array_unique()                 Removes duplicate values from an array               4
array_unshift()                 Adds one or more elements to the beginning of an array              4
array_values()                  Returns all the values of an array              4
array_walk()                      Applies a user function to every member of an array      3
array_walk_recursive()                                Applies a user function recursively to every member of an array               5
arsort()                 Sorts an array in reverse order and maintain index association    3
asort()                  Sorts an array and maintain index association     3
compact()           Create array containing variables and their values             4
count()                 Counts elements in an array, or properties in an object  3
current()              Returns the current element in an array                3
each()                   Returns the current key and value pair from an array      3
end()                     Sets the internal pointer of an array to its last element   3
extract()              Imports variables into the current symbol table from an array     3
in_array()            Checks if a specified value exists in an array         4
key()                     Fetches a key from an array        3
krsort()                 Sorts an array by key in reverse order    3
ksort()                  Sorts an array by key      3
list()                      Assigns variables as if they were an array              3
natcasesort()     Sorts an array using a case insensitive "natural order" algorithm 4
natsort()              Sorts an array using a "natural order" algorithm 4
next()                   Advance the internal array pointer of an array    3
pos()                     Alias of current()              3
prev()                   Rewinds the internal array pointer           3
range()                 Creates an array containing a range of elements               3
reset()                  Sets the internal pointer of an array to its first element  3
rsort()                   Sorts an array in reverse order   3
shuffle()              Shuffles an array              3
sizeof()                                Alias of count() 3
sort()                     Sorts an array    3
uasort()                Sorts an array with a user-defined function and maintain index association          3
uksort()                Sorts an array by keys using a user-defined function       3
usort()                 Sorts an array by values using a user-defined function    3

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