Can someone share a PHP program that converts a string to uppercase without using the built-in functions?

Hey [Your Name],

I completely understand your desire to find an alternative solution for converting a string to uppercase without using the built-in functions. While it's true that functions like `strtoupper()` already exist, sometimes exploring alternative methods can be an interesting challenge.

One way to achieve this is by iterating over each character in the string and converting it to its uppercase representation based on its ASCII value. Here's an example code snippet that might help you get started:

php
// Define the string you want to convert

$string = "hello world";



// Create an empty variable to store the uppercase version

$uppercaseString = "";



// Iterate over each character in the string

for ($i = 0; $i < strlen($string); $i++) {

    $asciiValue = ord($string[$i]);

    

    // Check if the character is a lowercase letter

    if ($asciiValue >= 97 && $asciiValue <= 122) {

        // Convert it to uppercase by subtracting 32 from the ASCII value

        $uppercaseCharacter = chr($asciiValue - 32);

    } else {

        // Leave the character unchanged if it's not a lowercase letter

        $uppercaseCharacter = $string[$i];

    }

    

    // Append the converted character to the uppercaseString variable

    $uppercaseString .= $uppercaseCharacter;

}



// Output the resulting uppercase string

echo $uppercaseString;

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Hey there,

I can understand your curiosity in finding an alternative method to convert a string to uppercase without relying on built-in functions. It's always exciting to explore different approaches to solving problems!

One possible solution, which is slightly different from the previous suggestion, is to utilize the ASCII values of characters and perform manipulations to convert lowercase letters to uppercase. Here's a code snippet that you can try out:

php
// Define the string you want to convert

$inputString = "hello world";



// Create an empty string to store the uppercase version

$upperString = "";



// Iterate through each character in the input string

for ($i = 0, $length = strlen($inputString); $i < $length; $i++) {

    $char = $inputString[$i];

    $asciiValue = ord($char);



    // Check if the character is a lowercase letter

    if ($asciiValue >= 97 && $asciiValue <= 122) {

        // Add the difference between lowercase and uppercase ASCII values

        $char = chr($asciiValue - 32);

    }



    // Append the updated character to the upperString variable

    $upperString .= $char;

}



// Display the resulting uppercase string

echo $upperString;

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