PHP Exercises: Check if a given string starts with 'C#' or not

PHP Basic Algorithm: Exercise-12 with Solution

Write a PHP program to check if a given string starts with 'C#' or not.

Sample Solution:

PHP Code :

<?php
// Define a function named "test" that takes a parameter $str
function test($str) 
{
    // Check if the length of $str is less than 3 and it is equal to "C#",
    // or if the first two characters of $str are "C#" and the third character is a space.
    return (strlen($str) < 3 && $str == "C#") || (substr($str, 0, 2) == "C#" && substr($str, 2, 1) == ' ');
}

// Call the test function with argument "C# Sharp" and var_dump the result
var_dump(test("C# Sharp"));

// Call the test function with argument "C#" and var_dump the result
var_dump(test("C#"));

// Call the test function with argument "C++" and var_dump the result
var_dump(test("C++"));
?>

Explanation:

• Function Definition:
• The test function takes a single parameter, $str.
• Condition Check:
• The function checks if $str meets either of the following conditions:
• $str has fewer than 3 characters and is exactly equal to "C#" (e.g., if $str is "C#").
• The first two characters of $str are "C#" and the third character is a space (e.g., if $str is "C# Sharp").
• If either condition is true, the function returns true; otherwise, it returns false.
• Function Calls and Output:
  • First Call: test("C# Sharp")
    • The string starts with "C#" and has a space as the third character, so it returns true.
  • Second Call: test("C#")
    • The string is exactly "C#", which matches the first condition, so it returns true.
  • Third Call: test("C++")
    • Neither condition is met (it’s neither "C#" nor starts with "C# "), so it returns false.

Output:

bool(true)
bool(true)
bool(false)

Visual Presentation:

Flowchart:

PHP Code Editor:

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