PHP two-dimensional arrays converted to strings

The two-dimensional array is converted to a string, with the middle, separating function arr_to_str ($arr) {    foreach ($arr as $v) {        $v = join (",", $v); You can use implode to convert a one-dimensional array to a comma-concatenated string, and the join is an alias        $temp [] = $v;    }    foreach ($temp as $v) {        $t. = $v. ",";    }    $t =substr ($t, 0,-1);  Use the string intercept function to eliminate the last comma    return $t;}

Ps:
SUBSTR applications
$str = "1,2,3,4,5,6,"; $newstr = substr ($str, 0,strlen ($STR)-1); Echo $newstr;
The system comes with functions that can also achieve this effect, two methods:
1) substr ($str, 0,-1);
2) RTrim ($str, ",")            
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