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PHP | Find the occurrences of a given element in an array

Finding occurrences of an element in an array: Here, we are going to learn how to find the occurrences of an element in the given array in PHP? For that, we are using array_keys() and count() functions of PHP. By Bhanu Sharma Last updated : December 19, 2023

Prerequisites

To understand this example, you should have the basic knowledge of the following PHP topics:

• PHP Basic Syntax
• PHP Variables
• PHP Arrays
• PHP array_keys() Function
• PHP count() Function
• PHP Strings
• PHP echo() Statement

Occurrences of a Given Element in an Array

Given an array and an element, we have to find the occurrences of the element in the array.

To find the occurrences of a given element in an array, we can use two functions,

1. array_keys()
   It returns an array containing the specified keys (values).
2. count()
   It returns the total number of elements of an array i.e. count of the elements.

Firstly, we will call array_keys() function with the input array (in which we have to count the occurrences of the specified element) and element, array_keys() will return an array containing the keys, then we will call the function count() and pass the result of the array_keys() which will finally return the total number of occurrences of that element.

PHP code to find the occurrences of a given element

<?php
//an array of the string elements
$array = array(
    "The",
    "Quick",
    "Brown",
    "Fox",
    "Jumps",
    "Right",
    "Over",
    "The",
    "Lazy",
    "Dog",
);

//word/element to find the the array
$word = "The";
//finding the occurances
$wordCount = count(array_keys($array, $word));
//printing the result
echo "Word <b>" . $word . "</b> Appears " . $wordCount . " time(s) in array\n";

//word/element to find the the array
$word = "Hello";
//finding the occurances
$wordCount = count(array_keys($array, $word));
//printing the result
echo "Word <b>" . $word . "</b> Appears " . $wordCount . " time(s) in array\n";
?>

Output

Word The Appears 2 time(s) in array
Word Hello Appears 0 time(s) in array

Explanation

Here, we have an array $array with the string elements and then assigning the element to $word to find its occurrences, as mentioned the above example, element "The" appears two times in the $array and element "Hello" doesn't appear.

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