Display mysql field length with PHP

1. How to display mysql field length.
2. Show mysql table's field length with php.
3. List all field lengths of mysql table.

This script lists field length of all mysql table fields.

Script

$i=0;
$sql = mysql_query("select * from products");

while($i < mysql_num_fields($sql)){

    echo mysql_field_len($sql, $i)  .  ', ';
    $i++;
}

Output

11, 250, 5, 5, 65535