DOMNode::getLineNo

(PHP 5 >= 5.3.0, PHP 7)

DOMNode::getLineNo — Get line number for a node

说明

public DOMNode::getLineNo ( void ) : int

Gets line number for where the node is defined.

参数

此函数没有参数。

返回值

Always returns the line number where the node was defined in.

范例

Example #1 DOMNode::getLineNo() example


<?php
// XML dump for below example
$xml = <<<XML
<?xml version="1.0" encoding="utf-8"?>
<root>
    <node />
</root>
XML;

// Create a new DOMDocument instance
$dom = new DOMDocument;

// Load the XML
$dom->loadXML($xml);

// Print where the line where the 'node' element was defined in
printf('The <node> tag is defined on line %d', $dom->getElementsByTagName('node')->item(0)->getLineNo());
?>

以上例程会输出：

The <node> tag is defined in line 3

User Contributed Notes

ruud at vanmelick dot com 25-Oct-2013 09:15


The 65535 line number limit is no longer a problem when you use libxml 2.9 or higher, but you have to explicitly enable support for big line numbers:



<?php

define('XML_PARSE_BIG_LINES', 4194304);

$dom = new DOMDocument;

$dom->loadXML($xml, XML_PARSE_BIG_LINES);

?>

Anonymous 19-May-2012 02:21


The DOMNode::getLineNo() method doesn't work properly due to a libxml2 bug. 



https://bugzilla.gnome.org/show_bug.cgi?id=676026

luke dot NOREPLY at webconnex dot com 04-Mar-2011 06:28


This function is buggy. It doesn't always return the correct line number, especially for text elements. As an alternative you can do something like this:



<?php

$text = $node->ownerDocument->saveXML($node);

$line += substr_count($text, "\n");

?>



You'll want to keep a reference to $line (starting at 0) and add to it as you parse over the document recursively.



In order for this to work you have to tell DOMDocument to preserve white space before loading the document.