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

In PHP, there are two versions of logical AND and OR operators.

Operator True if
$a and $b Both $a and $b are true
$a && $b Both $a and $b are true
$a or $b Either $a or $b is true
$a || $b Either $a or $b is true

Note that the && and || opererators have higher precedence than and and or. See table below:

Evaluation Result of $e Evaluated as
$e = false || true True $e = (false || true)
$e = false or true False ($e = false) or true

Because of this it's safer to use && and || instead of and and or.