PHP | DsDeque 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("\nInex 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
)

Inex 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("\nInex 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
)

Inex of 3 in the deque: bool(false)

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

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