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PHP Ds / Deque sort () Function

Syntax:
public DsDeque::sort ($comparator): void
Parameters ::This function takes one $comparator parameter, which contains a function that decides how to sort the elements. This helps in customizing the sorting function.Return value:This function does not return any value.The following programs illustrate the Ds / Deque::sort()in PHP:Program 1:  
// Declare deque $deck = new DsDeque ( [5, 6, 3, 2, 7, 1]); echo ( " Elements of Deque " );  
// Show Deque elements print_r ( $deck );  
// Use the sort() function to sort
// elements $deck -> sort(); echo ( " Sorted Deque " );  
// Show Deque elements print_r ( $deck ) ;;  
?>
Exit:
Elements of Deque DsDeque Object ([0] = > 5 [1] = > 6 [2] = > 3 [3] = > 2 [4] = > 7 [5] = > 1) Sorted Deque DsDeque Object ([0] = > 1 [1] = > 2 [2] = > 3 [3] = > 5 [4] = > 6 [5] = > 7)
Program 2:  
// Declare deque $deck = new DsDeque ([5, 6, 3, 2, 7, 1]); echo ( " Elements of Deque " );  
// Show Deque elements print_r ( $deck );  
// comparator for reverse sorting $deck -> sort ( function ( $first , $second ) { return $first < = $second ; }); echo ( " Sorted Deque " );  
// Show Deque elements print_r ( $deck ) ;;  
?>
Exit:
Elements of Deque DsDeque Object ([0] = > 5 [1] = > 6 [2] = > 3 [3] = > 2 [4] = > 7 [5] = > 1) Sorted Deque DsDeque Object ([0] = > 7 [1] = > 6 [2] = > 5 [3] = > 3 [4] = > 2 [5] = > 1)
Link: http://php.net/manual/en/ds-deque. sort.php

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