计算数组中重复的数量？

Question

我下面的话

(“hello”, “apple”, “hello”, “hello”, “apple”, “orange”, “cake”) 

Result here should be 5

阵列接触，你能告诉我，如果有在PHP的库函数，我可以用它来算多少重复的单词出现在我的阵列？任何帮助将不胜感激。

Answer 1

$array = array(“hello”, “apple”, “hello”, “hello”, “apple”, “orange”, “cake”); 
$unique_elements = array_unique($array); 
$totalUniqueElements = count($unique_elements); 
echo $totalUniqueElements; 
//Output 5 

Hope this will help you. 

Answer 2

您可以count()结合array_unique()：

$number_of_duplicates = count($words) - count(array_unique($words)); 

注： PHP有百余Array Functions。学习它们会使你成为better PHP Developer。

Answer 3

尝试这样

$count1 = count($array); 
$count2 = count(array_unique($array)); 
echo $count1 - $count2; 

Answer 4

你可以这样做：

$org = count($array); 
$unique = count(array_unique($array)); 
$duplicates = $org - $unique 

Answer 5

检查array_count_valueshttp://us2.php.net/manual/en/function.array-count-values.php

<?php 
var_dump(array_count_values($words)); 

Output: 
Array(
    [hello] => 3, 
    [apple] => 2, 
    [orange] => 1, 
    [cake] => 1 
)