How to convert string to uppercase in php

php method to convert a string to uppercase: first create a PHP sample file; then directly convert all specified strings to uppercase through the "strtoupper("Hello WORLD!");" statement.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

strtoupper() function converts a string to uppercase.

Note: This function is binary safe.

Example

Convert all characters to uppercase:

<?php
echo strtoupper("Hello WORLD!");
?>

Output:

HELLO WORLD.

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