using global variables inside a function

I used the global declaration and it works.

You have to pass it to the function:

&lt;?php
    $sxml = new SimpleXMLElement('&lt;somexml/&gt;');

    function foo($sxml){
        $child = $sxml-&gt;addChild('child');
    }

    foo($sxml);
?&gt;

<?php

$sxml = new SimpleXMLElement('<somexml/>');

function foo($sxml){

$child = $sxml->addChild('child');

}

foo($sxml);

or declare it global:

&lt;?php
    $sxml = new SimpleXMLElement('&lt;somexml/&gt;');

    function foo(){
        global $sxml;
        $child = $sxml-&gt;addChild('child');
    }

    foo();
?&gt;

<?php

$sxml = new SimpleXMLElement('<somexml/>');

function foo(){

global $sxml;

$child = $sxml->addChild('child');

}

foo();

If the variable isn’t global but is instead defined in an outer function, the first option (passing as an argument) works just the same:

&lt;?php
    function bar() {
        $sxml = new SimpleXMLElement('&lt;somexml/&gt;');
        function foo($sxml) {
            $child = $sxml-&gt;addChild('child');
        }
        foo($sxml);
    }
    bar();
?&gt;

<?php

function bar() {

$sxml = new SimpleXMLElement('<somexml/>');

function foo($sxml) {

$child = $sxml->addChild('child');

}

foo($sxml);

}

bar();

Alternatively, create a closure by declaring the variable in a use clause.

&lt;?php
    function bar() {
        $sxml = new SimpleXMLElement('&lt;somexml/&gt;');
        function foo() use(&amp;$xml) {
            $child = $sxml-&gt;addChild('child');
        }
        foo();
    }
    bar();
?&gt;

<?php

function bar() {

$sxml = new SimpleXMLElement('<somexml/>');

function foo() use(&$xml) {

$child = $sxml->addChild('child');

}

foo();

}

bar();

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