如何統計每個類型在數組中的數量？

Question

我需要計算此數組中存在caracter 1,2,3,4,5的次數，例如爲了這個，我應該得到回答 1 - 兩次 2 - 兩次 3 - 一次 4 - 三次

<?php 
array(8) { 
    [0]=> 
    array(2) { 
    [0]=> 
    string(1) "3" 
    ["answer"]=> 
    string(1) "3" 
    } 
    [1]=> 
    array(2) { 
    [0]=> 
    string(1) "4" 
    ["answer"]=> 
    string(1) "4" 
    } 
    [2]=> 
    array(2) { 
    [0]=> 
    string(1) "1" 
    ["answer"]=> 
    string(1) "1" 
    } 
    [3]=> 
    array(2) { 
    [0]=> 
    string(1) "1" 
    ["answer"]=> 
    string(1) "1" 
    } 
    [4]=> 
    array(2) { 
    [0]=> 
    string(1) "2" 
    ["answer"]=> 
    string(1) "2" 
    } 
    [5]=> 
    array(2) { 
    [0]=> 
    string(1) "2" 
    ["answer"]=> 
    string(1) "2" 
    } 
    [6]=> 
    array(2) { 
    [0]=> 
    string(1) "4" 
    ["answer"]=> 
    string(1) "4" 
    } 
    [7]=> 
    array(2) { 
    [0]=> 
    string(1) "4" 
    ["answer"]=> 
    string(1) "4" 
    } 
} 
?> 

Answer 1

如果這是從數據庫返回的數據，爲什麼不使用數據庫查詢做爲你計數？

SELECT answer, 
     COUNT(1) AS instances 
    FROM myTable 
GROUP BY answer