Detailed explanation of the usage of custom functions in PHP introductory tutorial (creation, calling, variables, parameters, return values, etc.)

The examples in this article describe the usage of PHP custom functions. Share it with everyone for your reference, the details are as follows:

Demo1.php

'; echo sha1('123456'); echo '阅谁问君诵，水落清香浮。'; ?>

Demo2.php

Demo3.php

Demo4.php

Demo5.php

Demo6.php

Demo7.php

'; echo $tax;//0.25 echo '
'; } functionPrices($prices,$tax) ; //引用这个概念，我们目前无法掌握，会在OOP时候，重点讲解 echo $prices;//按值传50，按引用就变成75 echo '
'; echo $tax; ?>

Demo8.php

Demo9.php

Demo10.php

Demo11.php

阅谁问君诵，水落清香浮。' ?>

Demo12.php

'; echo ffff(); ?>

I hope this article will be helpful to everyone PH P Programming helps.

For more detailed explanations of the usage of custom functions in PHP introductory tutorials (creation, calling, variables, parameters, return values, etc.), please pay attention to the PHP Chinese website!