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PHP Ds / Map sort () function

Syntax :
DsPair public DsMap::skip (int $position)
Parameter: this function takes a comparator function according to which the values ​​are compared when sorting the map. The comparator should return the following values ​​based on a comparison of the two values ​​passed to it as a parameter:
  • 1:if the first element is expected to be less than the second element.
  • -1:if the first element is expected to be larger than the second.
  • 0:if the first is expected the element will be equal to the second element.
Return value:The function does not return any value. It simply sorts the specified Map instance according to the passed compare function.The following programs illustrate the Ds / Map::sort()function:Program 1:
// PHP program to illustrate the sort() function $map = new DsMap ([1 = > 20, 2 = > 10, 3 = > 30]);  
// sort the map $map -> sort();  
// Print the sorted map print_r ( $map );  
?>
Output:
DsMap Object ([0] = > DsPair Object ([key] = > 2 [value] = > 10) [1] = > DsPair Object ([key] = > 1 [value] = > 20) [2] = > DsPair Object ([key] = > 3 [value] = > 30))
Program 2:
// PHP program to illustrate the sort() function $map = new DsMap ([1 = > 20, 2 = > 10, 3 = > 30]);  
// Comparator function declaration $comp = function ( $first , $second ) { if ( $first > $second ) return -1; else if ( $first < $second ) return 1; else return 0; };  
// sort the map $map -> sort ( $comp );  
// Print the sorted map print_r ( $map );  
?>
Output:
DsMap Object ([0] = > DsPair Object ([key] = > 3 [value] = > 30) [1] = > DsPair Object ([key] = > 1 [value] = > 20) [2] = > DsPair Object ([key] = > 2 [value] = > 10))
Link : http://php.net/manual/en/ds-map.sort.php

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