PHP array_multisort() Function

PHP array_multisort () Function

The array_multisort() function in PHP sorts multiple or multi-dimensional arrays at once.

Syntax

array_multisort ( array &$array1 [, mixed $array1_sort_order [, mixed $array1_sort_flags [, mixed $... ]]] )

Parameter

array1(required)- This parameter specified the input array to sort.

array1_sort_order(optional)- This parameter specifies the order (ascending or descending) to use where SORT_ASC(the default value) is used to sort ascendingly and SORT_DESC is used to sort descendingly.

array1_sort_flags(optional)- This parameter represents the various sort options for the arrays. The sorting flags are as follows:

• SORT_REGULAR(default value)- It is used to compare items normally without changing the type.
• SORT_NUMERIC- It is used to compare items numerically
• SORT_STRING- It compares the items as strings
• SORT_LOCALE_STRING- It compares items as strings, based on the current locale.
• SORT_NATURAL- It is used to compare items as strings using "natural ordering" 
• SORT_FLAG_CASE- It can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings case-insensitively

Return

This function returns a Boolean value TRUE on success or FALSE on failure.

Example 1

Output

Array before sorting...
 array (
   0 => 10,
   1 => 100,
   2 => 100,
   3 => 0,
 ) 
 Array after sorting...
 array (
   0 => 0,
   1 => 10,
   2 => 100,
   3 => 100,
 ) 

Example 2

Output

array (
   0 => 
   array (
     0 => 100,
     1 => 100,
     2 => 101,
     3 => '20', 
     4 => 'value',
   ),
   1 => 
   array (
     0 => '20',
     1 => 13,
     2 => 12, 
     3 => 11,
     4 => 11,
   ),
 ) 

Example 3

Output

array (
   0 => 
   array (
     0 => 100,
     1 => 100,
     2 => 101,
     3 => '20',
     4 => 'value',
   ),
   1 =>  
   array (
     0 => '20',
     1 => 13,
     2 => 12,
     3 => 11,
     4 => 11, 
   ),
 )