PHP XPath ends-with

Question

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How to use XPath function in a XPathExpression instance programatically?

I'm trying to find all of the rows of a nested table that contain an image with an id that ends with '_imgProductImage'.

I'm using the following query:

"//tr[/td/a/img[ends-with(@id,'_imgProductImage')]"

I'm getting the error: xmlXPathCompOpEval: function ends-with not found

My google searches i believe say this should be a valid query/function. What's the actual function i'm looking for if it's not "ends-with"?

score 13 · Accepted Answer · edited Jun 20 '20 at 09:12

from How to use XPath function in a XPathExpression instance programatically?

One can easily construct an XPath 1.0 expression, the evaluation of which produces the same result as the function ends-with():

$str2 = substring($str1, string-length($str1)- string-length($str2) +1)

produces the same boolean result (true() or false()) as:

ends-with($str1, $str2)

so for your example, the following xpath should work:

//tr[/td/a/img['_imgProductImage' = substring(@id, string-length(@id) - 15)]

you will probably want to add a comment that this is a xpath 1.0 reformulation of ends-with().

@Alejandro see my comment to the question. – ax. Mar 26 '11 at 02:06 — ax., Mar 26 '11 at 02:06

Pascal MARTIN · Answer 2 · 2011-03-25T17:05:03.473

9

It seems that ends-with() is an XPath 2.0 function.

DOMXPath only supports XPath 1.0

Edit after the comment : In your case, I suppose you'll have to :

Find all images, using a simpler XPath query, that will return more images than what you want -- but include those you want to keep.
Loops over those, testing in PHP, for each one of them, if the id attribute (see the getAttribute method) matches what you want.

To test if the attribute is OK, you could use something like this, in the loop that iterates over the images :

$id = $currentNode->getAttribute('id');
if (preg_match('/_imgProductImage$/', $id)) {
    // the current node is OK ;-)
}

Note that, in my regex pattern, I used a $ to indicate end of string.

edited Mar 25 '11 at 17:05

answered Mar 25 '11 at 16:35

Pascal MARTIN

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Is there a regex function or anything that i can use to get the same effect? – Matt Mar 25 '11 at 16:38
@Matt I've edited my answer with a couple more informations – Pascal MARTIN Mar 25 '11 at 16:43
See also [`registerPHPFunctions`](http://php.net/domxpath.registerphpfunctions) to perform the `preg_match` or other functions within the xpath – Kevin Peno Mar 25 '11 at 16:49
@Pascal, also note that PHP requires delimiters. `preg_match('/_imgProductImage$/' ...` – Kevin Peno Mar 25 '11 at 16:50
@Kevin oops, shame on me for having forgotten those :-( -- I'll edit right away, thanks for your comment. – Pascal MARTIN Mar 25 '11 at 17:04

score 5 · Answer 3 · answered Mar 25 '11 at 16:55

5

There is no ends-with function in XPath 1.0, but you can fake it:

"//tr[/td/a/img[substring(@id, string-length(@id) - 15) = '_imgProductImage']]"

answered Mar 25 '11 at 16:55

Wayne

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score 4 · Answer 4 · answered Mar 25 '11 at 16:56

4

If you're on PHP 5.3.0 or later, you can use registerPHPFunctions to call any PHP function you want, although the syntax is a little odd. For example,

$xpath = new DOMXPath($document);
$xpath->registerNamespace("php", "http://php.net/xpath");
$xpath->registerPHPFunctions("ends_with");
$nodes = $x->query("//tr[/td/a/img[php:function('ends-with',@id,'_imgProductImage')]"

function ends_with($node, $value){
    return substr($node[0]->nodeValue,-strlen($value))==$value;
}

answered Mar 25 '11 at 16:56

Anomie

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Some say that the code here would not be working (but they don't provide any further details so far either), in case you're interested, it's via here: http://stackoverflow.com/q/19563167/367456 – hakre Oct 24 '13 at 12:47

PHP XPath ends-with

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