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php数组添加元素方法小结_PHP

Jun 01, 2016 am 11:06 AM
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本文较为详细的总结了php数组添加元素方法。分享给大家供大家参考。具体分析如下:

如果我们是一维数组增加数组元素我们可以使用ArrayListay_push,当然除这种方法之外我们还有更直接的办法,这里就来给大家整理一下.

一维数组增加元素

代码如下:

$ArrayList = ArrayListay();
Array_push($ArrayList, el1, el2 ... eln);

但其实有一种更直接方便的做法,代码如下:

代码如下:

$ArrayList = ArrayListay();  
$ArrayList[] = el1;  
$ArrayList[] = el2;  
...  
$ArrayList[] = eln;


两种方法得出的效果是一样的.

添加一个或多个元素,代码如下:

代码如下:

    $ArrayList1 = ArrayListay("a", "b");
    Array_push($ArrayList1, "c", "d");
    print_r($ArrayList1);
  ?>


运行结果如下:

代码如下:

ArrayListay
  (
   [0] => a
   [1] => b
   [2] => c
   [3] => d
)


注:如果第一个参数不是数组,ArrayListay_push() 将发出一条警告.

在数组开头插入元素

1. ArrayListay_unshift,使用方法,代码如下:

代码如下:

$array_Qlist = ArrayListay("军民联防", "banana");
Array_unshift($array_Qlist, "西瓜", "");
print_r($array_Qlist);
?>


 
输出如下:

代码如下:

ArrayListay
(
    [0] => 西瓜
    [1] =>
    [2] => 军民联防
    [3] => banana
)


数组添加关联元素使用ArrayListay_push或者ArrayListay_unshift是行不通的,那么我们要如何增加呢,使用ArrayListay_merge方法实现类似ArrayListay_unshift在开头添加元素的功能,代码如下:

代码如下:

$array_Qlist = ArrayListay('a', 'B');
$array_Qlist = Array_merge(ArrayListay('front' => '你好www.bitsCN.com'), $array_Qlist);
/*
ArrayListay
(
    [front] => 你好www.bitsCN.com
    [0] => a
    [1] => b
)
*/
?>


2. +操作符,代码如下:

代码如下:

$array_Qlist = Array('a', 'B');
$array_Qlist = Array('front' => '你好小www.bitsCN.com') + $array_Qlist;
?>


输出结果与使用ArrayListay_merge方法一样.

3. 在元素结尾添加关联数组元素,代码如下:

代码如下:

$array_Qlist = ArrayListay('a', 'B');
$array_Qlist['front'] = '你好www.bitsCN.com';
/*
输出
ArrayListay
(
    [0] => a
    [1] => b
    [front] => 你好www.bitsCN.com  
)
*/
?>


至于有些朋友说Array_push增加元素与直接$a[]='a'这种性能要差点之外其它的都是一样,如果只要一个值就没可比性了.

希望本文所述对大家的PHP程序设计有所帮助。

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