Convert a string variable to upper case in php

Hello everyone,

I wanted to share an alternative method that I often use to convert a string to uppercase in PHP. Instead of using any built-in functions, you can rely on the ASCII values of the characters and perform a manual conversion.

Here's an example of how it can be done:

php
$myString = "Hello, World!";

$upperCaseString = "";

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

    $char = $myString[$i];

    if (ord($char) >= ord('a') && ord($char) <= ord('z')) {

        $char = chr(ord($char) - 32);

    }

    $upperCaseString .= $char;

}

echo $upperCaseString;

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Hey there!

I've encountered a similar situation before where I needed to convert a string to uppercase in PHP. To accomplish this, you can use the strtoupper() function. It takes the string as input and returns the uppercase version of it.

Here's an example of how you can use it:

php
$myString = "Hello, World!";

$upperCaseString = strtoupper($myString);

echo $upperCaseString;

Hey!

I've been in a similar situation where I needed to convert a string to uppercase in PHP. Based on my own experience, one approach you can take is to use the mb_strtoupper() function. This function is specifically designed to handle multibyte characters, making it useful in scenarios where you're working with non-ASCII characters or multibyte encodings like UTF-8.

Here's an example of how you can utilize mb_strtoupper():

php
$myString = "こんにちは, 世界!";

$upperCaseString = mb_strtoupper($myString, 'UTF-8');

echo $upperCaseString;

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