php - 计算数组中重复项的数量？

Question

我有一个数组联系以下单词

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

Result here should be 5

你能告诉我是否有一个库函数PHP可以用来计算我的数组中有多少重复的单词？任何帮助将不胜感激。

Answer 1

您可以array_unique()结合count()：

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

注意： PHP 有一百多个数组函数。学习它们将使您成为更好的 PHP 开发人员。

Answer 2

检查array_count_values http://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
)

Answer 3

像这样试试

$count1 = count($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

$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.