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  1. Python
  2. PHP Ds / Deque first () Function

PHP Ds / Deque first () Function

Syntax:
public DsDeque::first (void): mixed
Parameters: this function takes no parameters.Return value:this function returns the first element from Deque if deque is not empty.The following programs illustrate the function Ds / Deque::first()in PHP:Program 1:  
// Declare deque $deck = new DsDeque ([10, 20, 3, 40, 50, 6]); echo ( " Elements in the Deque " );  
// Show Deque elements print_r ( $deck ); echo ( " First element in the deque: " );  
// Use the first() function to search
// first element in the deck var_dump ( $deck -> first());  
?> Exit:
Elements in the Deque DsDeque Object ([0] = > 10 [1] = > 20 [2] = > 3 [3] = > 40 [4] = > 50 [5] = > 6) First element in the deque: int (10)
Program 2: < table border = "0" cellpadding = "0" cellspacing = "0">  
// Declare deque $deck = new DsDeque ([ "Geeks" , "for" , " GFG " ]); echo ( " Elements in the Deque " );  
// Show Deque elements print_r ( $deck ); echo ( " First element in the deque: " );  
// Use the first() function to search
// first element in the deck var_dump ( $deck -> first());  
?> Exit:
Elements in the Deque DsDeque Object ([0] = > Geeks [1] = > for [2] = > GFG) First element in the deque: string (5) "Geeks"
Link : http://php.net/manual/en/ds-deque.first.php
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