PHP conversion case tutorial basics

In order to take care of friends who are just learning PHP, this chapter will share with you the most basic knowledge: how to convert upper and lower case in PHP. We will use examples to explain.

strtoupper()

All letters become uppercase

strtolower()

All letters become lowercase

ucwords()

The first letter of each word is converted to uppercase

ucfirst()

The first letter of the first word is converted to uppercase

lcfirst()

The first letter of the first word becomes lowercase

Example:

$foo = 'hello world!';
$foo = ucwords($foo);             // Hello World!
 
$bar = 'HELLO WORLD!';
$bar = ucwords($bar);             // HELLO WORLD!
$bar = ucwords(strtolower($bar)); // Hello World!
 
$foo = 'hello world!';
$foo = ucfirst($foo);             // Hello world!
 
$bar = 'HELLO WORLD!';
$bar = ucfirst($bar);             // HELLO WORLD!
$bar = ucfirst(strtolower($bar)); // Hello world!
 
$foo = 'HelloWorld';
$foo = lcfirst($foo);             // helloWorld
 
$bar = 'HELLO WORLD!';
$bar = lcfirst($bar);             // hELLO WORLD!
$bar = lcfirst(strtoupper($bar)); // hELLO WORLD!

The above content is a detailed explanation of PHP case conversion. I hope this website will be helpful to everyone.

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