php数组字符串之间的互相转化

数组转字符串

$a = [1,2,3];
$string = implode(",",$a);
//输出结果为：“1，2，3”
$b = "1,2";
$array = explode(',',$b);
//输出结果为：array (size=2)
//  0 => string '1' (length=2)
//  1 => string '2' (length=1)