PHP Program to Count Vowels in a String

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be capitalized. or lowercase.

What is a vowel?

Vowels are alphabetic characters representing specific pronunciations. There are five vowels in English, including caps and lowercase:

<code>a, e, i, o, u</code>

Example 1

• Input: String = "Tutorialspoint"
• Output: 6

Explanation

The vowels in the string "Tutorialspoint" are

u, o, i, i, a, o, i. There are a total of 6

vowels.

Example 2

• Input:
String = "PHP"
• Output:
0

Explanation

The string "PHP" does not contain any vowels, so the count is 0.

Example 3

• Input:
String = "Ayush Mishra"
• Output:
4

Explanation

The vowels in the string are a, u, i, i, a

. There are a total of

4

vowels.

• The following are different ways to use PHP to count vowels in strings:
Use direct logic method

Using function

Use direct logic methods to count vowels in strings

We use a simple loop to iterate over the string and check if each character is a vowel. If so, increment the counter. After the loop ends, we return the total number of vowels.

1. Implementation steps
First, define a string as input parameter.
Now, initialize the count variable to 0.
Loop through each character in the string.
For each character, check if it is a vowel (case insensitive).
Add count variables for each vowel.

Returns the count of vowels.

<?php
$string = "Anshu Ayush";
$vowel_count = 0;

// 将字符串转换为小写
$string = strtolower($string);

// 循环遍历字符串中的每个字符
for ($i = 0; $i < strlen($string); $i++) {
    if (in_array($string[$i], ['a', 'e', 'i', 'o', 'u'])) {
        $vowel_count++;
    }
}

// 输出
echo "字符串 '$string' 中元音的数量是：$vowel_count";

?>

Implementation code

<code>字符串 'anshu ayush' 中元音的数量是：3</code>

Output
Time complexity: O(n)

Space complexity:

O(1)

Use function to count vowels in strings In this method, we use a function to calculate the number of vowels in a string. We use a function so that we can use it later as needed.

Implementation steps

1. First, create a function that accepts strings as input.
2. Now, initialize the count variable to 0 and convert the string to lowercase.
3. Transfer through the string and check vowels with a predefined list.
4. Add count variables for each vowel.
5. Returns the count of vowels.

Implementation code

<code>a, e, i, o, u</code>

Output

<?php
$string = "Anshu Ayush";
$vowel_count = 0;

// 将字符串转换为小写
$string = strtolower($string);

// 循环遍历字符串中的每个字符
for ($i = 0; $i < strlen($string); $i++) {
    if (in_array($string[$i], ['a', 'e', 'i', 'o', 'u'])) {
        $vowel_count++;
    }
}

// 输出
echo "字符串 '$string' 中元音的数量是：$vowel_count";

?>

Time complexity: O(n)
Space complexity: O(1)

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