public DsDeque::first (void): mixedParameters: 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:
// 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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