PHP Exercises: Create a new string of length 2, using first two characters of a given string

PHP Basic Algorithm: Exercise-75 with Solution

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.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that modifies the input string based on its length
function test($s1)
{ 
  // Check if the length of the string is greater than or equal to 2
  if (strlen($s1) >= 2)
     {
       // If true, extract the first two characters from the string
       $s1 = substr($s1, 0, 2);
      }
  // If the length is greater than 0 but less than 2
  else if (strlen($s1) > 0)
      {
       // Extract the first character and concatenate "#" to it
       $s1 = substr($s1, 0, 1) . "#";
      }
  // If the length is 0
  else
      {
       // Set the string to "##"
       $s1 = "##";
      }
   // Return the modified string
   return $s1;
}

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

Explanation:

• Function Definition:
• The test function is defined with a single parameter:
• $s1: the input string.
• String Modification Based on Length:
• The function has three cases based on the length of $s1:
• If the length is 2 or more:
• Extracts the first two characters of $s1 using substr($s1, 0, 2).
• If the length is 1:
• Extracts the first character and appends a "#" to it, making $s1 = substr($s1, 0, 1) . "#".
• If the length is 0:
• Sets $s1 to "##".
• Return Value:
• Returns the modified $s1 based on the above conditions.

Output:

He
Py
a#
 #

Flowchart:

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to create a new string taking 3 characters from the middle of a given string at least 3.
Next: 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.