Ds\Stack::pop()PHP函数用于删除Stack实例顶部的元素。删除堆栈后, 此函数还返回堆栈的顶部元素。
语法如下:
mixed public Ds\Stack::pop ( void )
参数:该函数不接受任何参数。
返回值混合混合的此函数返回出现在堆栈顶部的元素, 并将其从堆栈中删除。
下面的程序说明了Ds \ Stack :: pop()PHP中的功能:
程序1:
<?php
// PHP program to illustarte the
// pop() function
// Create a Stack instance
$stack = new \Ds\Stack();
// Pushing elements to Stack
$stack ->push( "Welcome" );
$stack ->push( "to" );
$stack ->push( "GfG" );
// Print the initial Stack
print_r( $stack );
// Print the top element and remove it
print_r( $stack ->pop());
// Print the Stack again
print_r( $stack );
?>
输出如下:
Ds\Stack Object
(
[0] => GfG
[1] => to
[2] => Welcome
)
GfG
Ds\Stack Object
(
[0] => to
[1] => Welcome
)
程式2:
<?php
// PHP program to illustarte the
// pop() function
// Create a Stack instance
$stack = new \Ds\Stack();
// Pushing Mixed value elements to Stack
$stack ->push( "Welcome" );
$stack ->push( "to" );
$stack ->push( "GfG" );
$stack ->push(10);
$stack ->push(5.5);
// Print the Stack initially
print_r( $stack );
// Print the top element and remove it
print_r( $stack ->pop());
// Print the stack again
print_r( $stack );
?>
输出如下:
Ds\Stack Object
(
[0] => 5.5
[1] => 10
[2] => GfG
[3] => to
[4] => Welcome
)
5.5
Ds\Stack Object
(
[0] => 10
[1] => GfG
[2] => to
[3] => Welcome
)
参考:http://php.net/manual/en/ds-stack.pop.php