function.sort

Source of: /manual/en/function.sort.php


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sort

(PHP 4, PHP 5)

sort — Sort an array

Description

bool sort
( array &$array
[, int $sort_flags = SORT_REGULAR
] )

This function sorts an array. Elements will be arranged from
lowest to highest when this function has completed.

Parameters

array

The input array.

sort_flags

The optional second parameter sort_flags
may be used to modify the sorting behavior using these values:

Sorting type flags:

• 
  SORT_REGULAR - compare items normally
  (don't change types)
  
• 
  SORT_NUMERIC - compare items numerically
  
• 
  SORT_STRING - compare items as strings
  
• 
  SORT_LOCALE_STRING - compare items as
  strings, based on the current locale. Added in PHP 4.4.0 and 5.0.2, it
  uses the locale, which can be changed using setlocale().
  
  
  
• 
  SORT_NATURAL - compare items as strings
  using "natural ordering" like natsort(). Added in
  PHP 5.4.0.
  
• 
  SORT_FLAG_CASE - can be combined
  (bitwise OR) with
  SORT_STRING or
  SORT_NATURAL to sort strings case-insensitively. Added in PHP 5.4.0.
  

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 sort() example


<?php

$fruits = array("lemon", "orange", "banana", "apple");sort($fruits);
foreach ($fruits as $key => $val) {
    echo "fruits[" . $key . "] = " . $val . "\n";
}
?>



The above example will output:

fruits[0] = apple
fruits[1] = banana
fruits[2] = lemon
fruits[3] = orange

The fruits have been sorted in alphabetical order.

Example #2 sort() example using case-insensitive natural
ordering


<?php

$fruits = array(
    "Orange1", "orange2", "Orange3", "orange20");sort($fruits, SORT_NATURAL | SORT_FLAG_CASE);
foreach ($fruits as $key => $val) {
    echo "fruits[" . $key . "] = " . $val . "\n";
}
?>



The above example will output:

fruits[0] = Orange1
fruits[1] = orange2
fruits[2] = Orange3
fruits[3] = orange20

The fruits have been sorted like natcasesort().

Notes

Note: This function
assigns new keys to the elements in array.
It will remove any existing keys that may have been assigned, rather
than just reordering the keys.

Note:

Like most PHP sorting functions, sort() uses an
implementation of » Quicksort.

Warning

Be careful when sorting arrays with mixed types values because
sort() can produce unpredictable results.

See Also

• asort() - Sort an array and maintain index association
• The comparison of array sorting functions

Sumber :http://www.php.net