What is the function in php to convert letters to uppercase?

There are three functions in php to convert letters to uppercase, namely: 1. strtoupper function, used to convert strings to uppercase; 2. ucfirst function, used to convert the first character in a string to uppercase ;3. The ucwords function is used to convert the first character of each word in the string to uppercase.

The operating environment of this article: windows7 system, PHP version 7.1, DELL G3 computer

The function of php to convert letters to uppercase is What?

strtoupper() function converts a string to uppercase.

Note: This function is binary safe.

Related functions:

lcfirst() - Convert the first character in the string to lowercase

strtolower() - Convert the string to lowercase

ucfirst() - Converts the first character in the string to uppercase

ucwords() - Converts the first character of each word in the string to uppercase

Syntax

strtoupper(string)

Parameters

string required. Specifies the string to be converted.

Example

Convert all characters to uppercase:

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

Running result:

HELLO WORLD.

Recommended learning: "PHP video tutorial 》

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