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"
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