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PHP Exercises: Create a new string of the characters at indexes 0,1,4,5,8,9 ... from a given string

PHP Basic Algorithm: Exercise-36 with Solution

Write a PHP program to create a new string of the characters at indexes 0,1,4,5,8,9 ... from a given string.

Sample Solution:

PHP Code :

<?php
// Define a function that extracts substrings from a given string
function test($s)
{
    // Initialize an empty string to store the result
    $result = "";

    // Iterate through the characters of the input string with a step size of 4
    for ($i = 0; $i < strlen($s); $i = $i + 4)
    {
        // Calculate the end index of the substring
        $c = $i + 2;

        // Initialize a variable to store the substring length
        $n = 0;

        // Determine if the calculated end index is beyond the length of the string
        $z = $c > strlen($s) ? 1 : 2;

        // Update the substring length based on the condition
        $n = $n + $z;

        // Append the extracted substring to the result
        $result = $result . substr($s, $i, $n);
    }

    // Return the final result
    return $result;
}

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

Sample Output:

Pyon
JaScpt
HT

Visual Presentation:

PHP Basic Algorithm Exercises: Create a new string of the characters at indexes 0,1,4,5,8,9 ... from a given string.

Flowchart:

Flowchart: Create a new string of the characters at indexes 0,1,4,5,8,9 ... from a given string.

PHP Code Editor:

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Previous: Write a PHP program to compare two given strings and return the number of the positions where they contain the same length 2 substring.
Next: Write a PHP program to count the number of two 5's are next to each other in an array of integers. Also count the situation where the second 5 is actually a 6.

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