How to convert to uppercase letters in php

In PHP, you can use the built-in ucwords() function or strtoupper() function to convert a string to uppercase letters.

ucwords() function can convert the first letter of each word in the string (with spaces as delimiters) to uppercase letters, while strtoupper() function can convert all letters in the string to uppercase letters .

The following are examples of usage of these two functions:

1. ucwords() function

$str = "hello world";
echo ucwords($str); // 输出 Hello World

2. strtoupper() function

$str = "hello world";
echo strtoupper($str); // 输出 HELLO WORLD

In addition, if you want to convert only a certain part of the characters in the string to uppercase letters, you can use the mb_strtoupper() function in PHP, which can specify the character encoding in order to correctly handle multi-byte characters.

The following is an example of using the mb_strtoupper() function:

$str = "Acme products co., Ltd.";
echo mb_strtoupper($str, "UTF-8"); // 输出 ACME PRODUCTS CO., LTD.

The above is a simple method to convert a string to uppercase letters in PHP. Both the ucwords() function and the strtoupper() function are very easy to use, and the mb_strtoupper() function can help you correctly handle multi-byte characters.

The above is the detailed content of How to convert to uppercase letters in php. For more information, please follow other related articles on the PHP Chinese website!