How to Find Duplicates in Array

Given an unsorted array. How to find duplicates in array using PHP. These types of questions are generally asked in interviews. Sometimes interviewer allows to use in-built function sometimes not.

How to Find Duplicates in Array

Let’s assume the element of an array is 5,1,2,1,7,5 . To solve this problem i am using PHP in-built function array_count_values().

Top five most used array functions.

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array_count_values() takes array as an argument and returns an array using the values of array as keys and their frequency in array as values.

The output of the array you print.

You can use other optimized approach to make key and value pair as well. You can also find duplicates element in array without using in-built function in minimum time complexity.

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