PHP Exercises: Create a new string made of every other character starting with the first from a given string

PHP Basic Algorithm: Exercise-29 with Solution

Write a PHP program to create a new string made of every other character starting with the first from a given string.

Sample Solution:

PHP Code :

<?php
// Define a function that extracts characters at even positions in a string
function test($s)
{
    // Initialize an empty string to store the result
    $result = "";

    // Iterate through the string
    for ($i = 0; $i < strlen($s); $i++) {
        // Check if the index is even and append the character to the result
        if ($i % 2 == 0) {
            $result .= substr($s, $i, 1);
        }
    }

    // Return the final result
    return $result;
}

// Test the function with different input strings
echo test("Python")."\n";
echo test("PHP")."\n";
echo test("JS")."\n";
?>

Explanation:

• Function Definition:
• The test function takes a single parameter, $s, which is a string. The function extracts and returns characters located at even index positions.
• Initialize Result Variable:
• An empty string $result is initialized to store characters found at even positions.
• Iterate Through String:
• A for loop iterates through each character of the string $s from index 0 to strlen($s) - 1.
• Check for Even Indexes:
• Inside the loop, the code checks if the index $i is even using the condition $i % 2 == 0. If true, it appends the character at index $i to $result.
• Return Final Result:
• After the loop completes, $result contains all characters from even positions in the string, which is then returned.

Output:

Pto
PP
J

Visual Presentation:

Flowchart:

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to check if the first appearance of "a" in a given string is immediately followed by another "a".
Next: Write a PHP program to create a string like "aababcabcd" from a given string "abcd".