PHP Program to Count Number of Vowels in a String
Last Updated :
19 Jul, 2024
Given a String, the task is to count the number of Vowels in a given string in PHP. Counting the number of vowels in a string is a common programming task, often encountered in text processing and data analysis. Here, we will cover three common scenarios for counting the number of Vowels in a String.
Using a Loop and in_array() function
One straightforward approach is to iterate through each character in the string and check if it is a vowel using in_array() function.
Example: The below example illustrates the total Count of the Number of Vowels in a String using a Loop and in_array() function.
PHP
<?php
function countVowels($str)
{
$str = strtolower($str);
$vowelCount = 0;
for ($i = 0; $i < strlen($str); $i++) {
if (in_array($str[$i], ["a", "e", "i", "o", "u"])) {
$vowelCount++;
}
}
return $vowelCount;
}
// Driver code
$str = "GeeksforGeeks";
$vowelsCount = countVowels($str);
echo "Number of vowels: " . $vowelsCount;
?>
OutputNumber of vowels: 5
Using Regular Expressions
Regular expressions provide a concise way to match patterns in strings. The following example uses a regular expression to count the vowels.
Example: The below example illustrates the total Count of the Number of Vowels in a String using Regular Expressions.
PHP
<?php
function countVowels($str)
{
// Case-insensitive match for vowels
preg_match_all("/[aeiou]/i", $str, $matches);
return count($matches[0]);
}
// Driver code
$str = "GeeksforGeeks";
$vowelsCount = countVowels($str);
echo "Number of vowels: " . $vowelsCount;
?>
OutputNumber of vowels: 5
Using str_ireplace() and strlen() Functions
Another approach is to replace all vowels in the string with an empty string using str_ireplace and then calculate the length of the resulting string.
Example: The below example illustrates the total Count of the Number of Vowels in a String using str_ireplace() and strlen() Functions.
PHP
<?php
function countVowels($str)
{
$strWithoutVowels =
str_ireplace(["a", "e", "i", "o", "u"], "", $str);
return strlen($str) - strlen($strWithoutVowels);
}
// Driver code
$str = "GeeksforGeeks";
$vowelsCount = countVowels($str);
echo "Number of vowels: " . $vowelsCount;
?>
OutputNumber of vowels: 5
Using count_chars() Function
Another method to count the number of vowels in a given string is by using the count_chars() function. This function returns information about the frequency of characters used in a string.
Example: This approach offers an efficient and clear method to count the number of vowels in a string using PHP's count_chars() function.
PHP
<?php
function countVowels($inputString) {
// Convert the string to lowercase to handle case-insensitivity
$inputString = strtolower($inputString);
// Use count_chars() to get the frequency of each character
$charCounts = count_chars($inputString, 1);
// List of vowels
$vowels = ['a', 'e', 'i', 'o', 'u'];
// Initialize vowel count
$vowelCount = 0;
// Iterate through the list of vowels and sum their counts
foreach ($vowels as $vowel) {
$ascii = ord($vowel);
if (isset($charCounts[$ascii])) {
$vowelCount += $charCounts[$ascii];
}
}
return $vowelCount;
}
$inputString = "GeeksforGeeks";
echo countVowels($inputString);
?>
Using array_count_values() Function
The array_count_values() function counts the frequency of each character in a string. By converting the string into an array of characters, the function counts how many times each character appears, allowing us to easily tally the number of vowels.
Example
PHP
<?php
function countVowelsArrayCountValues($str) {
$vowels = ['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'];
$count = 0;
$arrayStr = str_split($str);
$arrayCount = array_count_values($arrayStr);
foreach ($vowels as $vowel) {
if (isset($arrayCount[$vowel])) {
$count += $arrayCount[$vowel];
}
}
return $count;
}
echo "count_values: "
. countVowelsArrayCountValues("Welcome to GeeksforGeeks") . PHP_EOL;
?>
Output
count_values : 9
Similar Reads
Non-linear Components In electrical circuits, Non-linear Components are electronic devices that need an external power source to operate actively. Non-Linear Components are those that are changed with respect to the voltage and current. Elements that do not follow ohm's law are called Non-linear Components. Non-linear Co
11 min read
Spring Boot Tutorial Spring Boot is a Java framework that makes it easier to create and run Java applications. It simplifies the configuration and setup process, allowing developers to focus more on writing code for their applications. This Spring Boot Tutorial is a comprehensive guide that covers both basic and advance
10 min read
Class Diagram | Unified Modeling Language (UML) A UML class diagram is a visual tool that represents the structure of a system by showing its classes, attributes, methods, and the relationships between them. It helps everyone involved in a project—like developers and designers—understand how the system is organized and how its components interact
12 min read
Backpropagation in Neural Network Back Propagation is also known as "Backward Propagation of Errors" is a method used to train neural network . Its goal is to reduce the difference between the model’s predicted output and the actual output by adjusting the weights and biases in the network.It works iteratively to adjust weights and
9 min read
3-Phase Inverter An inverter is a fundamental electrical device designed primarily for the conversion of direct current into alternating current . This versatile device , also known as a variable frequency drive , plays a vital role in a wide range of applications , including variable frequency drives and high power
13 min read
Polymorphism in Java Polymorphism in Java is one of the core concepts in object-oriented programming (OOP) that allows objects to behave differently based on their specific class type. The word polymorphism means having many forms, and it comes from the Greek words poly (many) and morph (forms), this means one entity ca
7 min read
What is Vacuum Circuit Breaker? A vacuum circuit breaker is a type of breaker that utilizes a vacuum as the medium to extinguish electrical arcs. Within this circuit breaker, there is a vacuum interrupter that houses the stationary and mobile contacts in a permanently sealed enclosure. When the contacts are separated in a high vac
13 min read
CTE in SQL In SQL, a Common Table Expression (CTE) is an essential tool for simplifying complex queries and making them more readable. By defining temporary result sets that can be referenced multiple times, a CTE in SQL allows developers to break down complicated logic into manageable parts. CTEs help with hi
6 min read
Python Variables In Python, variables are used to store data that can be referenced and manipulated during program execution. A variable is essentially a name that is assigned to a value. Unlike many other programming languages, Python variables do not require explicit declaration of type. The type of the variable i
6 min read
Spring Boot Interview Questions and Answers Spring Boot is a Java-based framework used to develop stand-alone, production-ready applications with minimal configuration. Introduced by Pivotal in 2014, it simplifies the development of Spring applications by offering embedded servers, auto-configuration, and fast startup. Many top companies, inc
15+ min read