PHP Exercises: Count number of vowels in a given string

PHP: Exercise-96 with Solution

Write a PHP program to count number of vowels in a given string.

Note: Use a regular expression to count the number of vowels (A, E, I, O, U) in a string.

Sample Solution:

PHP Code:

<?php
// Licence: https://bit.ly/2CFA5XY

// Function definition for 'count_Vowels' that takes a string as a parameter
function count_Vowels($string)
{
    // Use 'preg_match_all' with a regular expression to find all vowels (case-insensitive) in the string
    preg_match_all('/[aeiou]/i', $string, $matches);

    // Return the count of matched vowels found in the string
    return count($matches[0]);
}

// Call 'count_Vowels' with a string and display the result using 'print_r'
print_r(count_Vowels('sampleInput'));

?>

Explanation:

• Function Definition:
• The count_Vowels function takes a single parameter:
• $string: the input string in which to count vowels.
• Finding Vowels:
• The function uses preg_match_all with the regular expression /[aeiou]/i:
• [aeiou]: matches any vowel (a, e, i, o, u).
• /i: makes the matching case-insensitive, so it includes both uppercase and lowercase vowels.
• The matching vowels are stored in $matches.
• Count Matched Vowels:
• count($matches[0]) returns the number of vowels found in $string.
• Function Call and Output:
• count_Vowels('sampleInput') counts the vowels in 'sampleInput' and outputs the result using print_r.

Output:

4

Flowchart:

PHP Code Editor:

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