PHP Exercises: Create a new string taking the first character from a given string and the last character from another given string

PHP Basic Algorithm: Exercise-76 with Solution

Write a PHP program to create a new string taking the first character from a given string and the last character from another given string. If the length of any given string is 0, use '#' as its missing character.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that extracts the first and last characters from two input strings
function test($s1, $s2)
{ 
    // Initialize an empty string to store the last characters
    $lastChars = "";

    // Check if the first string has a length greater than 0
    if (strlen($s1) > 0)
    {
        // If true, append the first character of $s1 to $lastChars
        $lastChars = $lastChars.substr($s1, 0, 1);
    }
    else
    {
        // If false, append "#" to $lastChars
        $lastChars = $lastChars."#";
    }

    // Check if the second string has a length greater than 0
    if (strlen($s2) > 0)
    {
        // If true, append the last character of $s2 to $lastChars
        $lastChars = $lastChars.substr($s2, strlen($s2) - 1);
    }
    else
    {
        // If false, append "#" to $lastChars
        $lastChars = $lastChars."#";
    }

    // Return the concatenated string containing the last characters
    return $lastChars;
}

// Test the 'test' function with different strings, then display the results using echo
echo test("Hello", "Hi")."\n";
echo test("Python", "PHP")."\n";
echo test("JS", "JS")."\n";
echo test("Csharp", "")."\n";
?>

Explanation:

• Function Definition:
• The test function is defined with two parameters:
• $s1: the first input string.
• $s2: the second input string.
• Initialize $lastChars:
• $lastChars is initialized as an empty string to store the resulting characters.
• Extract and Append Characters from $s1:
• If $s1 has a length greater than 0:
• The first character of $s1 is appended to $lastChars using substr($s1, 0, 1).
• If $s1 is empty:
• A "#" symbol is appended to $lastChars.
• Extract and Append Characters from $s2:
• If $s2 has a length greater than 0:
• The last character of $s2 is appended to $lastChars using substr($s2, strlen($s2) - 1).
• If $s2 is empty:
• A "#" symbol is appended to $lastChars.
• Return Value:
• Returns the $lastChars string, which contains the selected characters from $s1 and $s2.

Output:

Hi
PP
JS
C#

Flowchart:

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to create a new string of length 2, using first two characters of a given string. If the given string length is less than 2 use '#' as missing characters.
Next: Write a PHP program to concat two given strings (lowercase). If there are any double character in new string then omit one character.