Syntax:

public DsDeque::set ($index, $value): void

Parameters:this function takes two parameters as above and described below:

• index:this parameter contains the index value at which the element should be installed .
• value:this parameter contains the value that will be set for this index.

Returned value:this function does not return any value.The following programs illustrate the Ds / Deque::set()function in PHP:Program 1: < / strong> < tr>  
// Declare deque $deck = new DsDeque ([ "engineer" , "for" , "engineer" , "practice" ]); echo ( " Elements of Deque " );  
// Show Deque elements print_r ( $deck );  
// Update deque element at index 2 $deck -> set (2, "engineerforengineer" ); echo ( " Deque after setting value at index 2 " );  
// Show Deque elements print_r ( $deck );  
?> Exit:

Elements of Deque DsDeque Object ([0] = > engineer [1] = > for [2] = > engineer [3] = > practice) Deque after setting value at index 2 DsDeque Object ([0] = > engineer [ 1] = > for [2] = > engineerforengineer [3] = > practice)

Program 2:  
// Declare deque $deck = new DsDeque ([1, 2, 3, 4, 5, 6]); echo ( " Elements of Deque " );  
// Show Deque elements print_r ( $deck );  
// Update deque element at index 2 $deck -> set (4, 10); echo ( " Deque after setting value at index 2 " );  
// Show Deque elements print_r ( $deck );  
?> Exit:

Elements of Deque DsDeque Object ([0] = > 1 [1] = > 2 [2] = > 3 [3] = > 4 [4] = > 5 [5] = > 6) Deque after setting value at index 2 DsDeque Object ([0] = > 1 [1] = > 2 [2] = > 3 [3] = > 4 [4] = > 10 [5] = > 6)

Link: http://php.net/manual/en /ds-deque.set.php