PYTHON uksort

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Python replacement for PHP's uksort [ edit | history ]
In Python 2.4+, you should sort items by a "key" associated with each element. You provide a function which computes the key for each element.
def uksort(d, keyfunc):
    return [(k, d[k]) for k in sorted(d.keys(), key=keyfunc)]


In Python 2.x, you could also use a comparator function, but this feature has been removed in Python 3, and so should no longer be used:
def uksort(d, cmpfunc):
    return [(k, d[k]) for k in sorted(d.keys(), cmp=cmpfunc)]

PHP uksort

PHP original manual for uksort [ show | php.net ]

uksort

(PHP 4, PHP 5)

uksortSort an array by keys using a user-defined comparison function

Description

bool uksort ( array &$array , callback $cmp_function )

uksort() will sort the keys of an array using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function.

Parameters

array

The input array.

cmp_function

The callback comparison function.

Function cmp_function should accept two parameters which will be filled by pairs of array keys. The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 uksort() example

<?php
function cmp($a$b)
{
    
$a preg_replace('@^(a|an|the) @'''$a);
    
$b preg_replace('@^(a|an|the) @'''$b);
    return 
strcasecmp($a$b);
}

$a = array("John" => 1"the Earth" => 2"an apple" => 3"a banana" => 4);

uksort($a"cmp");

foreach (
$a as $key => $value) {
    echo 
"$key$value\n";
}
?>

The above example will output:

an apple: 3
a banana: 4
the Earth: 2
John: 1

See Also

  • usort() - Sort an array by values using a user-defined comparison function
  • uasort() - Sort an array with a user-defined comparison function and maintain index association
  • sort() - Sort an array
  • asort() - Sort an array and maintain index association
  • arsort() - Sort an array in reverse order and maintain index association
  • ksort() - Sort an array by key
  • natsort() - Sort an array using a "natural order" algorithm
  • rsort() - Sort an array in reverse order