w3resource

PHP: strtoupper() function

Description

The strtoupper() function is used to convert all alphabetic characters of a string to uppercase.

Version:

(PHP 4 and above)

Syntax:

strtoupper(string1)

Parameter:

Name Description Required /
Optional
Type
string1 The input string. Required String

Return value:

The uppercased string.

Value Type: String.

Pictorial Presentation

string_strtoupper

Example of php strtoupper() function

<?php
$string1="Welcome to w3resource.com";
echo strtoupper($string1); 
?>

Output:

WELCOME TO W3RESOURCE.COM

View the example in the browser

See also

PHP Function Reference

Previous: strtolower
Next: strtr



PHP: Tips of the Day

PHP: Using str_replace so that it only acts on the first match?

Can be done with preg_replace:

function str_replace_first($from, $to, $content)
{
    $from = '/'.preg_quote($from, '/').'/';

    return preg_replace($from, $to, $content, 1);
}

echo str_replace_first('abc', '123', 'abcdef abcdef abcdef'); 
// outputs '123def abcdef abcdef'

The magic is in the optional fourth parameter [Limit]. From the documentation:

[Limit] - The maximum possible replacements for each pattern in each subject string. Defaults to -1 (no limit).

Ref : https://bit.ly/35SCuP8