strtoupper function to convert Lowercase char to Upper case letters

strtoupper() to change all lower to uppercase characters

$my_str="Hello welcome to plus2net.com";
$my_str=strtoupper($my_str);
echo $my_str;

Above code output will be

HELLO WELCOME TO PLUS2NET.COM

Syntax

$val=strtoupper($input_sting);

We can use strtoupper() function in PHP to change all the alphabetic characters to uppercase. This simple function takes one string as input and changes the characters present inside to uppercase.
Here is an example code.

DEMO

Example 2: Converting User Input to Uppercase for Case-Insensitive Comparison

When comparing user input, converting both inputs to uppercase ensures case-insensitivity:

$input = "hello";
if (strtoupper($input) === strtoupper("HELLO")) {
    echo "Inputs match!";
}

Example 3: Converting Multibyte Characters to Uppercase

For handling multibyte characters, use *mb_strtoupper()* instead:

$str = "élève";
echo mb_strtoupper($str); // Outputs: ÉLÈVE

String Functions first letter of every word to capitalize by using ucwords Change all alphabetic chars to lowercase Checking all lower case or upper case chars in a string

Subhendu Mohapatra

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I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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