PHP iterates over the array $arr, ask what the structure of this $arr array is, and how the output traverses the output results: 1 2 3

Source: Internet
Author: User
PHP traversal Array $arr, what is the structure of this $arr array, how the output traversal output results: 1 2 3
With Print_r ($arr);
Output: Array ([0] = 1,3,2)
With Var_dump ($arr);
Output: Array (1) {[0]=> string (5) "1,3,2"}
The For loop output gets
for ($i = 0; $i < sizeof ($arr); $i + +) {
echo $arr [$i];
Comma actually also traversed out of there
What is the structure of this number, how can I take this for loop time to remove the comma?
Only this structure is exported:
------to solve the idea----------------------
$arr is an array of $arr=array (' All-in-one ')
You can $arr=explode (', ', Array (' All-in-one '));
Again for Loop
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