What are external & internal calls in HTML / PHP?

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I'm following some concepts about structured web design fundamentals.

Throughout the script I found the following phrase "external calls" & "internal calls".

This phrase is traumatizing me, I have been making so many links that at the time of the hour it does not matter to you until a certain sentence keeps you in the incognita.

The external, I understand that is what is outside the body.

Example 

<link rel="stylesheet" type="text/css" href="../1/2/style.css">

And the internal calls are the styles within the body.

  

In calls of PHP I imagine that the concept is assimilated the same

Can you explain this topic to me more thoroughly?

    
asked by Josues 12.08.2017 в 18:32
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1 answer

1

file calls are made through 

<?php include("inclues/funciones.php");
//o tambien 
require_once("inc/funciones.php");

?>
    
answered by 12.08.2017 в 18:48
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