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目录

PHP strtoupper() Function

❮ PHP String Reference

Example

Convert all characters to uppercase:

<?php
echo strtoupper("Hello WORLD!");
?>
Try it Yourself »

Definition and Usage

The strtoupper() function converts a string to uppercase.

Note: This function is binary-safe.

Related functions:

  • strtolower() - converts a string to lowercase
  • lcfirst() - converts the first character of a string to lowercase
  • ucfirst() - converts the first character of a string to uppercase
  • ucwords() - converts the first character of each word in a string to uppercase

Syntax

strtoupper( string)

Parameter Values

Parameter Description
string Required. Specifies the string to convert

Technical Details

Return Value: Returns the the uppercased string
PHP Version: 4+
❮ PHP String Reference