The field content in the data table stores a comma-separated string with a maximum of 20 numbers and a maximum of 40. For example, a sequence of numbers such as 3, 24, 3, and 40. It is actually a field that stores multiple voting results. Now you need to count the number of each number, that is
Solution
1. read data from the congtent field of the database and combine them into a string.
The code is as follows:
While ($ myrow = $ connector-> fetch_array ($ result ))
{
// $ R [] = explode (",", $ myrow ["content"]);
$ Str. = $ myrow ["content"]. ',';
}
$ Arr_str = substr ($ str, 0,-1 );
?>
Because the last number is followed by a comma, you must intercept the string.
2. split the string into arrays by commas.
The code is as follows:
$ R = explode (",", $ arr_str );
3. use array_count_values () to calculate the number of elements in a one-dimensional array.
Because array_count_values () does not seem to be able to directly count the number of elements in a two-dimensional array, we have performed the preceding two steps to obtain a one-dimensional array.
The array_count_values () function is used to count the number of occurrences of all values in the array. Returns an array. The key name of the element is the value of the original array, and the key value is the number of times this value appears in the original array.
The code is as follows:
$ Rs = array_count_values ($ r );
4. sorting
The code is as follows:
Asort ($ rs );
Echo'
';
Print_r ($ rs );
Echo'
';
