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PHP Array Sorting
Posted on: October 21, 2009 at 12:00 AM
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PHP Array Sorting: This PHP tutorial helps you to sort elements of an array by several functions like sort(), asort(), ksort(), rsort() etc. With the help of several examples you will come to know more about sorting in PHP.

Array Sort

To sort an array we need to use sort() function. Small description of sort is given below:

General Format bool sort(array $array [,int $sort_flags=SORT_REGULAR] )
Return Value True/False
Parameters array: the input array sort_flags:
  • sort_regular: normal comparison
  • sort_numeric: numeric comparison
  • sort_string: string comparison

Example 1:

<?php

$car=array("manza","safari","nano","vista","jaguar","land rover");

echo "<b>Before sorting the values are:</b>";

print_r($car);

sort($car);

echo"<br/>";

echo "<b>After sorting values become:</b>";

print_r($car);

?>

Output:

Before sorting the values are:Array ( [0] => manza [1] => safari [2] => nano [3] => vista [4] => jaguar [5] => land rover )
After sorting values become:Array ( [0] => jaguar [1] => land rover [2] => manza [3] => nano [4] => safari [5] => vista )

 

If we examine the above code and the result we can see that after being sorted the elements of the array are arranged in alphabetical order. Another method to sort the array is asort(). This function sorts an array and also maintain the index position. Small description of asort() is:

General Format bool asort(array $array [,int $sort_flags=SORT_REGULAR] )
Return Value True/False
Parameter array: the input array

 

sort_flags:
  • sort_regular: normal comparison
  • sort_numeric: numeric comparison
  • sort_string: string comparison

Example 2:

<?php

$car=array("m"=>"manza","s"=>"safari","n"=>"nano","v"=>"vista","j"=>"jaguar","l"=>"land rover");

echo "<b>Before sorting the values are:</b>";

print_r($car);

asort($car);

echo"<br/>";

echo "<b>After sorting values become:</b>";

print_r($car);

?>

Output:

Before sorting the values are:Array ( [m] => manza [s] => safari [n] => nano [v] => vista [j] => jaguar [l] => land rover )
After sorting values become:Array ( [j] => jaguar [l] => land rover [m] => manza [n] => nano [s] => safari [v] => vista )

Another function ksort() sorts an array by key. It is useful only in associative arrays. ksort() function maintains the key to data correlation.

General Format bool ksort(array $array [,int $sort_flags=SORT_REGULAR] )
Return Value True/False
Parameter array: the input array

 

sort_flags:
  • sort_regular: normal comparison
  • sort_numeric: numeric comparison
  • sort_string: string comparison

Example 3:

<?php

$car=array("a"=>"manza","c"=>"safari","b"=>"nano","e"=>"vista","d"=>"jaguar","f"=>"land rover");

echo "<b>Before sorting the values are:</b>";

print_r($car);

ksort($car);

echo"<br/>";

echo "<b>After sorting values become:</b>";

print_r($car);

?>

Output:

Before sorting the values are:Array ( [a] => manza [c] => safari [b] => nano [e] => vista [d] => jaguar [f] => land rover )
After sorting values become:Array ( [a] => manza [b] => nano [c] => safari [d] => jaguar [e] => vista [f] => land rover )

 

There are several functions are available in PHP, rsort() is one of them, it sorts an array in reverse order, rsort() is just opposite sort() function:

General Format bool rsort(array $array [,int $sort_flags=SORT_REGULAR] )
Return Value True/False
Parameter array: the input array

 

sort_flags:
  • sort_regular: normal comparison
  • sort_numeric: numeric comparison
  • sort_string: string comparison

 

Example 4:

<?php

$car=array("manza","safari","nano","vista","jaguar","land rover");

echo "<b>Before sorting the values are:</b>";

print_r($car);

rsort($car);

echo"<br/>";

echo "<b>After sorting values become:</b>";

print_r($car);

?>

Output:

Before sorting the values are:Array ( [0] => manza [1] => safari [2] => nano [3] => vista [4] => jaguar [5] => land rover )
After sorting values become:Array ( [0] => vista [1] => safari [2] => nano [3] => manza [4] => land rover [5] => jaguar )

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Posted on: October 21, 2009

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