Does a way exist for me to not have to redeclare a global variable in each function .. for example

class globalfunctions {
	
	public function digits_only($string) {
		return preg_replace('/\D/', '', $string);
	}
	
}

$f = new globalfunctions();
global $f;

echo getdigits('a123b');

function getdigits($string) {
	return $f->digits_only($string);
}

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Returns
PHP Fatal error:  Call to a member function digits_only() on a non-object in index.php on line 19

But if I redeclare "global $f;" in the getdigits function, it works.

Please advise
MarkProgrammerAsked:
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Ray PaseurCommented:
Short answer: Nope, PHP requires the global declaration inside the function definition.
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MarkProgrammerAuthor Commented:
Ok, thanks.
0
Ray PaseurCommented:
This works correctly.
http://iconoun.com/demo/temp_mark.php
<?php // demo/temp_mark.php
error_reporting(E_ALL);

class Globalfunctions 
{
    public function digits_only($string) 
    {
        return preg_replace('/\D/', '', $string);
    }
}

$f = new globalfunctions();
var_dump($f);

function getdigits($string) 
{
    global $f;
    return $f->digits_only($string);
}

echo getDigits('Abc123');

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That said, are you familiar with PHP object-oriented notation and the concepts of visibility, inheritance and static classes?  The ideas implemented in PHP OOP can make PHP programming much easier.
http://php.net/manual/en/language.oop5.php
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MarkProgrammerAuthor Commented:
I am new to OOP but thanks for the guide
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Ray PaseurCommented:
One thought... You can use the Scope Resolution Operator to make a direct reference to a class definition that contains the function (a.k.a. method) that you want to call.  This has two advantages.  First, it explicitly names the class and method, so there is no ambiguity about what you're using.  Second, it avoids injecting a global variable and therefore reduces the risk of a variable name collision.
<?php // demo/temp_mark.php
error_reporting(E_ALL);

class Globalfunctions
{
    public static function digits_only($string)
    {
        return preg_replace('/\D/', '', $string);
    }
}

function getdigits($string)
{
    return GlobalFunctions::digits_only($string);
}

echo getDigits('Abc123');

Open in new window

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