The natcasesort() function is an inbuilt function in PHP which is used to sort an array by using a “natural order” algorithm. The natural order tells the order to be used as a normal human being would use. That is, it does not check the type of value for comparison. For example, in string representation 30 is less than 7 according to the standard sorting algorithm as 3 comes before 7 lexicographically. But in natural order 30 is greater than 7. Also, the natcasesort() function is case insensitive. Syntax:
bool natcasesort($array )
Parameters: This function accepts a single parameter $array. It is the array which natcasesort() function is going to sort. Return Value It returns a boolean value i.e., TRUE on success and FALSE on failure. Below programs illustrate the natcasesort() function in PHP: Program 1:
<?php // input array $arr1 = array ( "Gfg12.jpeg" , "gfg10.jpeg" , "Gfg2.jpeg" , "gfg1.jpeg" );
$arr2 = $arr1 ;
// sorting using sort function. sort( $arr1 );
echo "Standard sorting\n" ;
print_r( $arr1 );
// Sorting using natcasesort() function. natcasesort( $arr2 );
echo "Natural order case insensitive: " ;
print_r( $arr2 );
?> |
Output:
Standard sorting: Array ( [0] => Gfg12.jpeg [2] => Gfg2.jpeg [3] => gfg1.jpeg [1] => gfg10.jpeg ) Natural order case insensitive: Array ( [3] => gfg1.jpeg [2] => Gfg2.jpeg [1] => gfg10.jpeg [0] => Gfg12.jpeg )
Program 2:
<?php // input array $arr = array ( "Gfg15.jpeg" , "gfg10.jpeg" , "Gfg1.jpeg" ,
"gfg22.jpeg" , "Gfg2.jpeg" );
// Sorting using natcasesort() function. natcasesort( $arr );
print_r( $arr );
?> |
Output:
Array ( [2] => Gfg1.jpeg [4] => Gfg2.jpeg [1] => gfg10.jpeg [0] => Gfg15.jpeg [3] => gfg22.jpeg )
Reference: http://php.net/manual/en/function.natcasesort.php