5_PHP数组_3_数组处理函数及其应用_8_数组与数据结构

以下为学习孔祥盛主编的《PHP编程基础与实例教程》（第二版）所做的笔记。

数组与数据结构

1. array_push() 函数

程序：

<?php
$stack = array("orange","banana");
$counts = array_push($stack,"apple","pear");
print_r($stack);
//Array ( [0] => orange [1] => banana [2] => apple [3] => pear ) 
echo "<br/>";
print_r($counts);
//4
?>

输出：

Array ( [0] => orange [1] => banana [2] => apple [3] => pear ) 
4

2. array_pop() 函数

程序：

<?php
$fruits = array('apple','banana','orange','pear');
$stack = array_pop($fruits);
print_r($fruits);
//Array ( [0] => apple [1] => banana [2] => orange )
echo "<br/>";
print_r($stack);
//pear
?>

输出：

Array ( [0] => apple [1] => banana [2] => orange ) 
pear

3. array_unshift() 函数

程序：

<?php
$fruits = array('apple','banana');
$counts = array_unshift($fruits,"orange");   //在队首插入
$counts = array_unshift($fruits,"pear");
print_r($fruits);   
//Array ( [0] => pear [1] => orange [2] => apple [3] => banana ) 
echo "<br/>";
echo $counts;        //4
?>

输出：

Array ( [0] => pear [1] => orange [2] => apple [3] => banana ) 
4

4. array_shift() 函数

程序：

<?php
$fruits = array('apple','banana','pear');
$counts = array_shift($fruits);   //在队首删除
//Array ( [0] => banana [1] => pear ) 
print_r($fruits);
echo "<br/>";
echo $counts;        //apple
?>

输出：

Array ( [0] => banana [1] => pear ) 
apple