PHP函数全局与需求

Question

I have a script that runs based on variables in another script. At the top of the script, I require the variables script.

I am trying to make my script easier to edit so I decided to create functions because a lot of my scripts do the exact same thing. In the functions, I need to pull some of the variables set in the variable script. I tried using require and it tends to make the script very slow. I know I can set PHP globals but I read somewhere that using globals is a bad idea? Is this true?

Is there a better way to do this besides using a require in the function or using globals?

Code:

function test() 
{
    require('var.php');

    // function code
}

OR

require('var.php');

function test() 
{
    global $var_variable1, $var_variable2;

    // function code
}

Answer 1

There is actually third option:

in file param.php

<?php
    $param = 1234;
?>

in file test.php

<?php

    require 'param.php';

    function foo( $bar )
    {
        var_dump( $bar );
    }

    foo( $param );

?>

But you should understand , that this is a very primitive way of dealing with variables and passing instructions from one piece of code to another.

When you are done with learning the basics of PHP language, you should start investigating Object Oriented programming methodology. That would be the way to grow.

Answer 2

When variables are fixed, it's a good solution to use constants.

Create a PHP file with all your constants:

<?php
define("FOO",     "something");
define("FOO2",    "someotherthing");
?>

By convention use UPPERCASE constant names. Into your script files use require_once() as the first line to include your script file where you define all your constants.

Do the same with a script containing all your support functions and require_once the file from your scripts.

If possible use OOP with PHP. With objects you can do very cool things.