php将字符串转为数组的方法

1.explode 使用一个字符串分割另一个字符串，返回一个数组

例1：
$data = "str1 str2 str3 str4 str5";
$arr = explode(" " , $data);
var_dump($arr);

例2：
$data = "str1,str2,str3,str4,str5";
$arr = explode(",",$data);
var_dump($arr);

结果：[str1,str2,str3,str4,str5]

2.str_split 将字符串转换为数组

$str = "Hello Friend";
$arr1 = str_split($str);
$arr2 = str_split($str,3);

结果：
Array
(
    [0] => H
    [1] => e
    [2] => l
    [3] => l
    [4] => o
    [5] =>
    [6] => F
    [7] => r
    [8] => i
    [9] => e
    [10] => n
    [11] => d
)

Array
(
    [0] => Hel
    [1] => lo
    [2] => Fri
    [3] => end
)