Ds\Deque::capacity()function是PHP中的内置函数, 用于获取Deque的当前容量。
语法如下:
public Ds\Deque::capacity( void ) : int
参数:该函数不接受任何参数。
返回值:此函数返回双端队列的当前容量。
下面的程序说明了Ds\Deque::capacity()PHP中的功能:
程序1:
<?php
// Allocating deque of default size
$deck = new \Ds\Deque();
echo ( "Default size of Deque: " );
// Display the current capacity of the deque
var_dump( $deck ->capacity());
// Allocating space for 50 values to the deque
$deck ->allocate(50);
echo ( "Allocated size of Deque: " );
// Display the current capacity of the deque
var_dump( $deck ->capacity());
?>
输出如下:
Default size of Deque: int(8)
Allocated size of Deque: int(64)
程式2:
<?php
// Declare Deque
$deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);
echo ( "Elements of Deque\n" );
// Display the Deque elements
var_dump( $deck );
echo ( "\nCapacity of Deque: " );
// Display the capacity of Deque
var_dump( $deck ->capacity());
?>
输出如下:
Elements of Deque
object(Ds\Deque)#1 (6) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
[3]=>
int(4)
[4]=>
int(5)
[5]=>
int(6)
}
Capacity of Deque: int(8)
参考: http://php.net/manual/en/ds-deque.capacity.php