CODEWITHSUNDEEP
phparraysusort
WatsMyName
WatsMyName

Reputation: 4478

using usort to sort array on the given sequence?

Well, There are many posts and questions using usort to sort array on custom pattern, but didnt find anything that matches my need. Here is the code I have so far,

$arrayToSort=array("Sabin","Anil","Cyrus","Kamal","Kesha","Bimal");

function mycmp($a, $b)
{
    static $order = array('A', 'B','C',"Ke'",'Ka','R', 'S');
    return array_search(substr($a,0,1), $order) - array_search(substr($b,0,1), $order);
}

usort($arrayToSort, "mycmp");

The above codes sorts $arrayToSort in following pattern

Array
(
    [0] => Anil
    [1] => Bimal
    [2] => Cyrus
    [3] => Kamal
    [4] => Kesha
    [5] => Sabin
)

However, if you look into my custom pattern static $order = array('A', 'B','C',"Ke'",'Ka','R', 'S'); Kesha should come before Kamal as in my pattern 'Ke' comes before 'Ka'

Again I know substr($a,0,1) takes the first character only that's why its not working. I also doubt that I have to take another approach to get job done, but I m not being able to figure it out.

How to sort if the element of array pattern is not consistent, i.e. some of the elements have one character while others have two? Any help will highly be appreciated. Thanks

Upvotes: 3

Views: 390

Answers (2)

sberry
sberry

Reputation: 132018

Here is a way you can do it. This could certainly be better optimized, but you get the idea.

<?php

class Accessor {
  static $order = array(
    'A' => 1,
    'B' => 1,
    'C' => 1,
    'K' => array(
      'e' => 1,
      'a' => 1,
    ),
    'R' => 1,
    'S' => 1
  );
}

$arrayToSort=array("Kamal","Kesha","Sabin","Anil","Cyrus","Bimal");

function mycmp($a, $b, $base) {
  $letter1 = $a[0];
  $letter2 = $b[0];
  if ($letter1 == $letter2) {
    if (is_array($base[$letter1])) {
      return mycmp(substr($a, 1), substr($b, 1), $base[$letter1]);
    }
  }
  return array_search($letter1, array_keys($base)) - array_search($letter2, array_keys($base));
}

function cmp_proxy($a, $b) {
  return mycmp($a, $b, Accessor::$order);
}

usort($arrayToSort, "cmp_proxy");
print_r($arrayToSort);

OUTPUT

Array
(
    [0] => Anil
    [1] => Bimal
    [2] => Cyrus
    [3] => Kesha
    [4] => Kamal
    [5] => Sabin
)

Upvotes: 1

Shehzad Bilal
Shehzad Bilal

Reputation: 2523

Try this

   $arrayToSort=array("Sabin","Anil","Cyrus","Kamal","Kesha","Bimal");

    function mycmp($a, $b)
    {
        static $order = array('A', 'B','C',"Ke'",'Ka','R', 'S');
        return searchArray($a, $order) - searchArray($b, $order);
    }
    function searchArray($str,$order) {

    $i = 1;
    do {

    $result = array_search(substr($str,0,$i++),$order);
    if($result)
    return $result
    }while(i < strlen($str))
    return -1;
    }
    usort($arrayToSort, "mycmp");

Upvotes: 0

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