PHP Exercises: Check if a string 'yt' appears at index 1 in a given string

PHP Basic Algorithm: Exercise-17 with Solution

Write a PHP program to check if a string 'yt' appears at index 1 in a given string. If it appears return a string without 'yt' otherwise return the original string.

Sample Solution:

PHP Code :

<?php
// Define a function that checks if the substring starting from the second position (index 1) is "yt"
// If true, the function returns a modified string excluding the character at index 1
// If false, the function returns the original string
function test($s) 
{
   return substr($s, 1, 2) == "yt" ? substr($s, 0, 1).substr($s, 3, strlen($s)-2) : $s;
}

// Test the function with various strings
echo test("Python")."\n";
echo test("ytade")."\n";
echo test("jsues")."\n";
?>

Explanation:

• Function Definition:
• The test function takes one parameter, $s, which represents a string.
• Substring Check and Conditional Return:
• The function checks if the substring of $s starting from the second position (index 1) is "yt".
• If true:
• The function returns a modified string that excludes the character at index 1 by concatenating:
• The first character of $s (using substr($s, 0, 1)).
• The rest of the string starting from index 3 (using substr($s, 3, strlen($s)-2)).
• If false:
• The function returns the original string $s.

Output:

Phon
ytade
jsues

Visual Presentation:

Flowchart:

PHP Code Editor:

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