php数组添加元素方法小结_PHP
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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