How php converts lowercase letters to uppercase

This article mainly explains "how php converts lowercase letters to capitalization". The explanation in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian slowly and deeply to study and learn "how php converts lowercase letters to capitalization" together!

Operating environment of this tutorial: Windows 7 system, PHP 7.1 version, DELL G3 computer

php There are three ways to convert lower-case letters to upper-case letters:

strtoupper() converts a string to upper case

ucfirst() converts the first letter of a string to upper case

ucwords() converts the first character of each word in a string to upper case

1) strtoupper

The strtoupper() function converts letters in a string to upper case in the following syntax:

strtoupper($str)

where $str is a string argument that converts the letters in the argument $string to uppercase and returns the converted string.

The sample code is as follows:

The results are as follows:

2) ucfirst

The ucfirst function converts the first letter of a string to upper case. The syntax format is as follows:

ucfirst($str)

where $str is the string to be converted.

The sample code is as follows:

The results are as follows:

Hello world! Hello world!

3) ucwords

The ucwords() function converts the first letter of each word in a string to upper case in the following syntax:

ucwords($str)

The sample code is as follows:

The results are as follows:

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