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PHP Ds / Deque apply () function

Syntax:
public DsDeque::apply ($callback): void
Parameters: This function takes one parameter, $callback, which contains a function that defines the operation to be performed on each Deque.Return value: this function does not return any value.The following programs illustrate the Ds / Deque::apply()function in PHP:Program 1:  
// Declare deque $deck = new DsDeque ([1, 2, 3, 4, 5, 6]); echo ( " Elements in the deque are " );  
// Show deque elements print_r ( $deck );  
// Use the apply() function to implement
// operation $deck -> apply ( function ( $element ) { return $element * 10; }); echo ( " Updated elements in the deque " );  
// Show deque elements print_r ( $deck );  
?>
Exit:
Elements in the deque are DsDeque Object ([0] = > 1 [1] = > 2 [2] = > 3 [3] = > 4 [4] = > 5 [5] = > 6) Updated elements in the deque DsDeque Object ([0] = > 10 [1] = > 20 [2] = > 30 [3] = > 40 [4] = > 50 [5] = > 60)
Program 2:  
// Declare deque $deck = new DsDeque ([10, 20, 30, 40, 50, 60]); echo ( " Elements in the deque are " );  
// Show deque elements print_r ( $deck );  
// Use the apply() function to implement
// operation $deck -> apply ( function ( $element ) { return $element % 10; }); echo ( " Updated elements in the deque " );  
// Show deque elements print_r ( $deck );  
?>
Exit:
Elements in the deque are DsDeque Object ([0] = > 10 [1] = > 20 [2] = > 30 [3] = > 40 [4] = > 50 [5] = > 60) Updated elements in the deque DsDeque Object ([0] = > 0 [1] = > 0 [2] = > 0 [3] = > 0 [4] = > 0 [5] = > 0)
Link: http://php.net/manual/en /ds-deque.apply.php

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