text 保存自https://wpshout.com/learning-php-for-wordpress-development-introduction-to-php-functions/

Posted 2021-04-30

<?php

// Defining the say_hello() function
function say_hello() {
	echo 'Hello world!';
}

// Calling the say_hello() function
say_hello(); // Will output "Hello world!"

// Defining the say_something() function with arguments
function say_something( $phrase = 'Hello world!' ) {
	echo $phrase;
}

// Calling the say_something() function with passed-in arguments
say_something( 'Hello PHP lovers!' ); // Will output "Hello PHP lovers!" 

?>