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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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