我们这里介绍的是在数组中再增加关联数组了,这个就合成了多维数组,下面我来给大家举几个实例,希望对各位同学会有所帮助。
在"php 数组添加元素方法总结这篇文章中介绍了如何给数组添加元素,那么我想添加$array=array('title'=>'php')这样的元素怎么办呢。
array_push, array_pop,array_shift,array_unshift 这几个函数都是为数字类型的索引数组设计的。
要想实现关联数组的添加可以使用array_merge方法或者是+操作符
我们先来看数组中增加数组元素
1.php中增加数组元素的方法:
(1)通过赋值增加数组元素 :$states[‘name’]=’Tom’;
(2)int array_push(array target_array,mixed variable [,mixed variable…]) 函数将variable增加到target_array的末尾,成功时返回true,否则返回false,其中variable可以是多个。
(3)int array_unshift(array target_array,mixed variable [,mixed variable…]) 函数将variable增加到target_array的数组头,成功时返回true,否则返回false,其中variable可以是多个。所有已有的数值键都会相应地修改,而关联键不受影响。
(4)array array_pad(array target_array,integer length,mixed pad_value) 将target_array 的大小增加到length指定的长度。
使用array_push或者array_unshift这两个方法行么?
答案是否定的,具体方法:
1.使用array_merge方法实现类似array_unshift在开头添加元素的功能,代码如下:
- <?php
- $queue = array('a', 'B');
- $queue = array_merge(array('front' => 'hello'), $queue);
- /*
- Array
- (
- [front] => hello
- [0] => a
- [1] => b
- )
- */
- ?>
2.+操作符,代码如下:
- <?php
- $queue = array('a', 'B');
- $queue = array('front' => 'Hello') + $queue;
- ?>
输出结果与使用array_merge方法一样。
3.在元素结尾添加关联数组元素,代码如下:
- <?php
- $queue = array('a', 'B');
- $queue['front'] = 'hello';
- /*
- 输出
- Array
- (
- [0] => a
- [1] => b
- [front] => hello
- )
- */
- ?>
波比源码 » php 数组添加关联元素的方法小结
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