   #PHP Manual Function Reference virtual array_change_key_case

   PHP Manual
   Prev  Next
   ______________________________________________________________________

II. Array Functions

Introduction

   These functions allow you to interact with and manipulate arrays in
   various ways. Arrays are essential for storing, managing, and
   operating on sets of variables.

   Simple and multi-dimensional arrays are supported, and may be either
   user created or created by another function. There are specific
   database handling functions for populating arrays from database
   queries, and several functions return arrays.

   Please see the Arrays section of the manual for a detailed explanation
   of how arrays are implemented and used in PHP.

Requirements

   No external libraries are needed to build this extension.

Installation

   There is no installation needed to use these functions; they are part
   of the PHP core.

Runtime Configuration

   This extension has no configuration directives defined in php.ini.

Resource Types

   This extension has no resource types defined.

Predefined Constants

   The constants below are always available as part of the PHP core.

   CASE_LOWER (integer)
          CASE_LOWER is used with array_change_key_case() and is used to
          convert array keys to lower case. This is also the default case
          for array_change_key_case().

   CASE_UPPER (integer)
          CASE_UPPER is used with array_change_key_case() and is used to
          convert array keys to upper case.

   Sorting order flags:

   SORT_ASC (integer)
          SORT_ASC is used with array_multisort() to sort in ascending
          order.

   SORT_DESC (integer)
          SORT_DESC is used with array_multisort() to sort in descending
          order.

   Sorting type flags: used by various sort functions

   SORT_REGULAR (integer)
          SORT_REGULAR is used to compare items normally.

   SORT_NUMERIC (integer)
          SORT_NUMERIC is used to compare items numerically.

   SORT_STRING (integer)
          SORT_STRING is used to compare items as strings.

   COUNT_NORMAL (integer)

   COUNT_RECURSIVE (integer)

   EXTR_OVERWRITE (integer)

   EXTR_SKIP (integer)

   EXTR_PREFIX_SAME (integer)

   EXTR_PREFIX_ALL (integer)

   EXTR_PREFIX_INVALID (integer)

   EXTR_PREFIX_IF_EXISTS (integer)

   EXTR_IF_EXISTS (integer)

   EXTR_REFS (integer)

See Also

   See also is_array(), explode(), implode(), split(), preg_split(), and
   unset().

   Table of Contents
   array_change_key_case -- Returns an array with all string keys
          lowercased or uppercased

   array_chunk -- Split an array into chunks
   array_combine --  Creates an array by using one array for keys and
          another for its values

   array_count_values -- Counts all the values of an array
   array_diff_assoc -- Computes the difference of arrays with additional
          index check

   array_diff_uassoc -- Computes the difference of arrays with additional
          index check which is performed by a user supplied callback
          function.

   array_diff -- Computes the difference of arrays
   array_fill -- Fill an array with values
   array_filter --  Filters elements of an array using a callback
          function

   array_flip -- Exchanges all keys with their associated values in an
          array

   array_intersect_assoc -- Computes the intersection of arrays with
          additional index check

   array_intersect -- Computes the intersection of arrays
   array_key_exists -- Checks if the given key or index exists in the
          array

   array_keys -- Return all the keys of an array
   array_map --  Applies the callback to the elements of the given arrays

   array_merge_recursive -- Merge two or more arrays recursively
   array_merge -- Merge two or more arrays
   array_multisort -- Sort multiple or multi-dimensional arrays
   array_pad --  Pad array to the specified length with a value
   array_pop -- Pop the element off the end of array
   array_push --  Push one or more elements onto the end of array
   array_rand --  Pick one or more random entries out of an array
   array_reduce --  Iteratively reduce the array to a single value using
          a callback function

   array_reverse --  Return an array with elements in reverse order
   array_search --  Searches the array for a given value and returns the
          corresponding key if successful

   array_shift --  Shift an element off the beginning of array
   array_slice -- Extract a slice of the array
   array_splice --  Remove a portion of the array and replace it with
          something else

   array_sum --  Calculate the sum of values in an array.
   array_udiff_assoc -- Computes the difference of arrays with additional
          index check. The data is compared by using a callback function.

   array_udiff_uassoc -- Computes the difference of arrays with
          additional index check. The data is compared by using a
          callback function. The index check is done by a callback
          function also

   array_udiff -- Computes the difference of arrays by using callback
          function for data comparison.

   array_unique -- Removes duplicate values from an array
   array_unshift --  Prepend one or more elements to the beginning of
          array

   array_values -- Return all the values of an array
   array_walk --  Apply a user function to every member of an array
   array --  Create an array
   arsort --  Sort an array in reverse order and maintain index
          association

   asort -- Sort an array and maintain index association
   compact --  Create array containing variables and their values
   count -- Count elements in a variable
   current -- Return the current element in an array
   each --  Return the current key and value pair from an array and
          advance the array cursor

   end --  Set the internal pointer of an array to its last element
   extract --  Import variables into the current symbol table from an
          array

   in_array -- Checks if a value exists in an array
   key -- Fetch a key from an associative array
   krsort -- Sort an array by key in reverse order
   ksort -- Sort an array by key
   list --  Assign variables as if they were an array
   natcasesort --  Sort an array using a case insensitive "natural order"
          algorithm

   natsort --  Sort an array using a "natural order" algorithm
   next --  Advance the internal array pointer of an array
   pos -- Get the current element from an array
   prev -- Rewind the internal array pointer
   range --  Create an array containing a range of elements
   reset --  Set the internal pointer of an array to its first element
   rsort -- Sort an array in reverse order
   shuffle -- Shuffle an array
   sizeof -- Alias of count()
   sort -- Sort an array
   uasort --  Sort an array with a user-defined comparison function and
          maintain index association

   uksort --  Sort an array by keys using a user-defined comparison
          function

   usort --  Sort an array by values using a user-defined comparison
          function
   ______________________________________________________________________

   Prev    Home                  Next
   virtual  Up  array_change_key_case
