PHP: Updating XML from PHP and Saving

Question

I'm trying to update 1 particular node in an pre-existing xml file from php. The problem i'm having is that it doesn't seem to be saving to the xml file. Not sure why and any help here will be appreciated!

<?php       
$itemNumber = $_GET["itemNumberField"];

$xmlFile = "items.xml";

if(file_exists($xmlFile))
{           

    // $doc = new DOMDocument('1.0');
    // $doc->load($xmlFile);

    $doc = DOMDocument::load($xmlFile); 

    $item = $doc->getElementsByTagName("item");

    foreach($item as $node) 
    {   
        $itemNumberNode = $node->getElementsByTagName("itemNumber");
        $itemNumberNode = $itemNumberNode->item(0)->nodeValue;

        $qtyNode = $node->getElementsByTagName("quantity");
        $qtyNode = $qtyNode->item(0)->nodeValue;                

        if ($itemNumberNode == $itemNumber)
        {
            $qtyNode++;

            echo $qtyNode;                  
        }
    }        
} 

else 
{       
    echo "file doesn't exist! <br/>";       
}

$doc->save($xmlFile);

?>

Edit: Just to clarify, the adding to the node seems to be fine.

Solution: Turns out the reason it didn't save was because node of the adding. i had to either directly update it or assign an updated value to it.

$qtyNode = $node->getElementsByTagName("quantity");
$qtyNode = $qtyNode->item(0);
...
$qtyNode->nodeValue++;

where are you trying to save the file? Local or remote?

Nuri Ensing
– Nuri Ensing

2015-10-20 11:45:27 +00:00
Commented Oct 20, 2015 at 11:45 — Nuri Ensing
– Nuri Ensing, Commented Oct 20, 2015 at 11:45
@bboni it's on a remote server.

WonderfulWonder
– WonderfulWonder

2015-10-20 11:51:16 +00:00
Commented Oct 20, 2015 at 11:51 — WonderfulWonder
– WonderfulWonder, Commented Oct 20, 2015 at 11:51

Daniel Faure · Accepted Answer · 2015-10-20 16:55:37Z

2

I've just coded something similar, and found out that $doc->saveXML() just builds up the outgoing xml string. I added a file_put_contents for writing to the xml file and worked fine.

file_put_contents($xmlFile, $doc->saveXML());

edited Oct 20, 2015 at 16:55

answered Oct 20, 2015 at 12:20

Daniel Faure

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Comments

ThW · Accepted Answer · 2015-10-20 13:39:13Z

1

You COPY the scalar value (string) into a variable. Then you change the variable.

    $qtyNode = $qtyNode->item(0)->nodeValue;                

    if ($itemNumberNode == $itemNumber)
    {
        $qtyNode++;

        echo $qtyNode;                  
    }

$qtyNode is not a DOMNode object, but a string variable.

You will have to change the DOMNode::$nodeValue property directly or assign the variable to it.

    $qtyNode = $qtyNode->item(0);                

    if ($itemNumberNode == $itemNumber)
    {
        $qtyNode->nodeValue++;

        echo $qtyNode->nodeValue;                  
    }

answered Oct 20, 2015 at 13:39

ThW

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Comments

Nuri Ensing · Accepted Answer · 2015-10-20 11:53:52Z

1

Chmod the folder in which you want to save xml file: set permissions to maxiamally 775.

If this not works try using Curl

answered Oct 20, 2015 at 11:53

Nuri Ensing

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