Bassicly what I want to do is using PHP open a xml file and edit it using php now this I can do using fopen() function. Yet my issue it that i want to append text to the middle of the document. So lets say the xml file has 10 lines and I want to append something before the last line (10) so now it will be 11 lines. Is this possible. Thanks
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php.net/manual/en/function.domnode-insert-before.phpseriousdev– seriousdev2010-12-19 16:15:30 +00:00Commented Dec 19, 2010 at 16:15
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2 Answers
Depending on how large that file is, you might do:
$lines = array();
$fp = fopen('file.xml','r');
while (!feof($fp))
$lines[] = trim(fgets($fp));
fclose($fp);
array_splice($lines, 9, 0, array('newline1','newline2',...));
$new_content = implode("\n", $lines);
Still, you'll need to revalidate XML-syntax afterwards...
10 Comments
DonJuma
okay after the 9 what is the 0 for. And where you have newline1 and newline2 is that where i would put information?
Linus Kleen
See the array_splice() documentation for details. 9 is the position at which to insert new elements. 0 is the number of elements after index 9 which you want to replace (none, in your case, I presume?) and those are followed by a replacement array.
DonJuma
okay so this looks good but it looks like you closed $fp does this still save the new text?
ajreal
bad idea ... use proper xml parsing
Linus Kleen
@ajreal I know. That's why I hinted on revalidating syntax. Still there's less overhead (providede the file is relatively small) in comparison to using a XML parsing facilies, which can only parse and (if at all) reconstruct an limited way...
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If you want to be able to modify a file from the middle, use the c+ open mode:
$fp = fopen('test.txt', 'c+');
for ($i=0;$i<5;$i++) {
fgets($fp);
}
fwrite($fp, "foo\n");
fclose($fp);
The above will write "foo" on the fifth line, without having to read the file entirely.
However, if you are modifying a XML document, it's probably better to use a DOM parser:
$dom = new DOMDocument;
$dom->load('myfile.xml');
$linenum = 5;
$newNode = $dom->createElement('hello', 'world');
$element = $dom->firstChild->firstChild; // skips the root node
while ($element) {
if ($element->getLineNo() == $linenum) {
$element->parentNode->insertBefore($newNode, $element);
break;
}
$element = $element->nextSibling;
}
echo $dom->saveXML();
Of course, the above code depends on the actual XML document structure. But, the $element->getLineNo() is the key here.
