PHP counts the words that appear most frequently in two data

This is a classic question that is often asked in interviews. It mainly tests the mastery of some unpopular functions of PHP.

Before answering this question, let’s learn two php array functions that are not commonly used.

• 1. array_count_values ​​counts the number of values ​​in the array

• 2. array_intersect_key finds the intersection of the keys of two arrays

Through these two functions, we can easily calculate the intersection of the two arrays What is the word that occurs most often at the same time?

The code is as follows:

<?php
$arr = array(&#39;A&#39;, &#39;B&#39;, &#39;A&#39;, &#39;B&#39;, &#39;C&#39;);
$arr2 = array(&#39;C&#39;, &#39;B&#39;, &#39;A&#39;, &#39;D&#39;, &#39;A&#39;);
$arr_count = array_count_values($arr);
$arr2_count = array_count_values($arr2);
print_r($arr_count);
print_r($arr2_count);
$result = array_intersect_key($arr_count, $arr2_count);
print_r($result);

Running result

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