PHP学习之数组

PHP学习之数组

简单的创建数组：

output:

array(size=5) 0 =>int1 1 =>int2 2 =>int3 3 =>int4 4 =>int5

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )

foreach 遍历数组：

"I",2=>"learn",3=>"php");foreach($s as $id=>$val){ echo $val."
";}?>

output:

I learn

php

数组元素修改：

"I",2=>"learn",3=>"php");foreach($s as $id=>$val){ echo $val."
";}echo ("
I delete second element:
");unset($s[2]);foreach($s as $id=>$val){ echo $id."--".$val."
";}echo ("
I change the last element:
");$s[3]="do"; // the last dex is 3 rather than 2 foreach($s as $val){ echo $val."
";}?>

output：

I

learn php

I delete second element:

1--I

3--php

I change the last element:

I

do

PHP相关函数：

数组有很多的函数，举一个例子：排序函数

";print_r($s);?>

output:

Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 5 [4] => 6 )

Array ( [0] => 6 [1] => 5 [2] => 2 [3] => 1 [4] => 0 )

下标改变带来的影响：

output：

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )

1,2,3,4,5);print_r($s);?>

output:

Array ( [4] => 1 [5] => 2 [6] => 3 [7] => 4 [8] => 5 )

1,2,10=>3,4,5);print_r($s);?>

output:

Array ( [4] => 1 [5] => 2 [10] => 3 [11] => 4 [12] => 5 )

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