PHP English letter uppercase/lowercase Conversion Function Summary

This article mainly introduces several PHP uppercase/lowercase conversion functions, which can be used to convert letters into uppercase/lowercase letters or convert all letters into uppercase/lowercase letters. For more information, see

This article mainly introduces several PHP uppercase/lowercase conversion functions, which can be used to convert letters into uppercase/lowercase letters or convert all letters into uppercase/lowercase letters. For more information, see

The initial letter of each word is converted to uppercase: ucwords ()

The Code is as follows:

$ Foo = 'Hello world! ';
$ Foo = ucwords ($ foo); // Hello World!

$ Bar = 'Hello WORLD! ';
$ Bar = ucwords ($ bar); // hello world!
$ Bar = ucwords (strtolower ($ bar); // Hello World!
?>

The first letter is capitalized: ucfirst ()

The Code is as follows:

$ Foo = 'Hello world! ';
$ Foo = ucfirst ($ foo); // Hello world!

$ Bar = 'Hello WORLD! ';
$ Bar = ucfirst ($ bar); // hello world!
$ Bar = ucfirst (strtolower ($ bar); // Hello world!
?>

The first letter of a word becomes smaller: lcfirst ()

The Code is as follows:

$ Foo = 'helloworld ';
$ Foo = lcfirst ($ foo); // helloWorld

$ Bar = 'Hello WORLD! ';
$ Bar = lcfirst ($ bar); // hELLO WORLD!
$ Bar = lcfirst (strtoupper ($ bar); // hELLO WORLD!
?>

Uppercase for all letters: strtoupper ()
Write down all letters: strtolower ()

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