php数组

### 创建数组
$arr=array();
$arr=[];

### 访问数组 
$arr=[
	'hobby'=>"pingpang",
	"basketball",
	"football"
]
echo $arr[0]  #basketball
echo $arr[1] #football
echo $arr["hobby"] #pingpang

### 查看数组
print_r($arr);
var_dump($arr);
Array ( [hobby] => pingpang [0] => basketball [1] => football ) 
array(3) { ["hobby"]=> string(8) "pingpang" [0]=> string(10) "basketball" [1]=> string(8) "football" }

### 字符串连接变量 用.
echo 'i love '.$arr[0];  #i love basketball

### 可以二维数组与三维数组，

$arr=[
	[1,2,3],
	[4,5,6],
	[7,8,9]

];
$arr=array(array(1,2,3),array(4,5,6),array(7,8,9));

### php数组循环
<?php

$arr=[
	"basketball",
	"football",
	"swim"
];
foreach($arr as $k=>$v){

echo $k."=>".$v;
echo '<hr>';

}
0=>basketball
1=>football
2=>swim