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

Last update on December 20 2024 10:26:34 (UTC/GMT +8 hours)

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:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to create a new string using three copies of the last two character of a given string of length atleast two.
Next: Write a PHP program to create a new string of the first half of a given string of even length.