Ds\Stack::peek

(PECL ds >= 1.0.0)

Ds\Stack::peek — Returns the value at the top of the stack

说明

public Ds\Stack::peek ( void ) : mixed

Returns the value at the top of the stack, but does not remove it.

参数

此函数没有参数。

返回值

The value at the top of the stack.

错误／异常

UnderflowException if empty.

范例

Example #1 Ds\Stack::peek() example

<?php
$stack = new \Ds\Stack();

$stack->push("a");
$stack->push("b");
$stack->push("c");

var_dump($stack->peek());
?>

以上例程的输出类似于：

string(1) "c"
相关文章
php arrayobject returns the value at the specified indexphp domelement returns value of attributephp deque returns the value at a given indexphp priorityqueue returns the value at the front of the queuephp queue returns the value at the front of the queuephp queue removes and returns the value at the front of the queuephp sequence returns the value at a given indexphp set returns the value at a given indexphp stack returns a representation that can be converted to jsonphp stack returns the value at the top of the stackphp stack removes and returns the value at the top of the stackphp vector returns the value at a given indexphp vector removes and returns the first valuephp apd 函数 returns the current call stack as an arrayphp imagickdraw returns the shape to be used at the corners of paths when they are strokedphp pht queue returns the first value from a queuephp solrquery returns the value of the facet parameterphp spldoublylinkedlist returns the value at the specified $indexphp splfixedarray returns the value at the specified indexphp weakmap returns the current value under iteration
关注编程学问公众号