PHP Exercises: Create a new string using first two characters of a given string

PHP Basic Algorithm: Exercise-62 with Solution

Write a PHP program to create a new string using first two characters of a given string. If the string length is less than 2 then return the original string.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that extracts the first two characters of a string
function test($s1)
{
    // Check if the length of s1 is less than 2
    if (strlen($s1) < 2)
    {
        // If true, return s1 as is
        return $s1;
    }
    else
    {
        // If false, use substr to extract the first two characters of s1
        return substr($s1, 0, 2);
    }
}

// Test the 'test' function with different input strings and display the results
echo test("Hello")."\n";
echo test("Hi")."\n";
echo test("H")."\n";
echo test("  ")."\n";
?>

Explanation:

• Function Definition:
• The function test is defined to take one parameter, $s1, which is expected to be a string.
• Length Check:
• The function first checks if the length of $s1 is less than 2 using strlen($s1) < 2.
• Return Logic:
• If Length < 2:
• If the length is less than 2, it returns $s1 as is (meaning the entire string, whether it's empty or a single character).
• If Length ≥ 2:
• If the length is 2 or more, it uses substr($s1, 0, 2) to extract the first two characters of the string and returns them.

Output:

He
Hi
H

Flowchart:

PHP Code Editor:

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