PHP | Ds\Deque find() Function

The Ds\Deque::find() function is an inbuilt function in PHP which is used to find the index of the element in the Deque if element found in the Deque.
Syntax: 
 

public Ds\Deque::find( $value ) : mixed

Parameters: This function accepts single parameter $value which holds the element whose index is to be found.
Return Value: This function returns the index of the element if element exist, else returns false.
Below programs illustrate the Ds\Deque::find() function in PHP:
Program 1: 
 

<?php

// Declare a deque
$deck = new \Ds\Deque([10, 20, 3, 40, 50, 6]);

echo("Elements in the Deque\n");

// Display the Deque elements
print_r($deck);

echo("\nIndex of 3 in the deque: ");

// Use find() function to find 
// the index of element
print_r($deck->find(3));

?>

Output:

Elements in the Deque
Ds\Deque Object
(
   [0] => 10
   [1] => 20
   [2] => 3
   [3] => 40
   [4] => 50
   [5] => 6
)
Index of 3 in the deque: 2

Program 2: 

<?php

// Declare a deque
$deck = new \Ds\Deque(["Geeks", "for", "GFG"]);

echo("Elements in the Deque\n");

// Display the Deque elements
print_r($deck);

echo("\nIndex of 3 in the deque: ");

// Use find() function to find 
// the index of element
var_dump($deck->find("ABC"));

?>

Output:

Elements in the Deque
Ds\Deque Object
(
   [0] => Geeks
   [1] => for
   [2] => GFG
)
Index of 3 in the deque: bool(false)

Reference: http://php.net/manual/en/ds-deque.find.php