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                                array_multisort

   (PHP 4 )
   array_multisort -- Sort multiple or multi-dimensional arrays

Description

   bool array_multisort ( array ar1 [, mixed arg [, mixed ... [, array
   ...]]])

   array_multisort() can be used to sort several arrays at once or a
   multi-dimensional array according by one of more dimensions. It
   maintains key association when sorting.

   The input arrays are treated as columns of a table to be sorted by
   rows - this resembles the functionality of SQL ORDER BY clause. The
   first array is the primary one to sort by. The rows (values) in that
   array that compare the same are sorted by the next input array, and so
   on.

   The argument structure of this function is a bit unusual, but
   flexible. The very first argument has to be an array. Subsequently,
   each argument can be either an array or a sorting flag from the
   following lists.

   Sorting order flags:

     * SORT_ASC - sort in ascending order
     * SORT_DESC - sort in descending order

   Sorting type flags:

     * SORT_REGULAR - compare items normally
     * SORT_NUMERIC - compare items numerically
     * SORT_STRING - compare items as strings

   No two sorting flags of the same type can be specified after each
   array. The sorting flags specified after an array argument apply only
   to that array - they are reset to default SORT_ASC and SORT_REGULAR
   before each new array argument.

   Returns TRUE on success or FALSE on failure.

   Example 1. Sorting multiple arrays
   <?php
   $ar1 = array("10", 100, 100, "a");
   $ar2 = array(1, 3, "2", 1);
   array_multisort($ar1, $ar2);
   ?>

   In this example, after sorting, the first array will contain 10, "a",
   100, 100. The second array will contain 1, 1, "2", 3. The entries in
   the second array corresponding to the identical entries in the first
   array (100 and 100) were sorted as well.

   Example 2. Sorting multi-dimensional array
   <?php
   $ar = array(array("10", 100, 100, "a"), array(1, 3, "2", 1));
   array_multisort($ar[0], SORT_ASC, SORT_STRING,
                   $ar[1], SORT_NUMERIC, SORT_DESC);
   ?>

   In this example, after sorting, the first array will contain 10, 100,
   100, "a" (it was sorted as strings in ascending order), and the second
   one will contain 1, 3, "2", 1 (sorted as numbers, in descending
   order).
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