> I'm still fighting with xpath.class.php
>
> I don't buy the fact the problems I have with xpath.class.php are related
> to my ISP because xml.php 1N6 works like a charm) and I use it a lot.
Yeah, I'm not that happy with it as the reason either...
> So I'd to have a detailed explanation of the meaning of the following
error :
> phpXML error: While parsing an XPath expression there was an error in the
> predicate "Gerhard", because it was the null string. If you wish to seach
> for the empty string, you must use ''.
>
>
> Context
> ========
> xpath.class.php
>
> Line 1996
> if (ereg('^\w*$', $predicate)) {
> // Display an error message.
> $this->_displayError("While parsing an XPath expression ".
> "there was an error in the predicate \"$predicate\", ".
> "because it was the null string. If you wish to seach ".
> "for the empty string, you must use ''.");
> return FALSE;
> }
>
> The error occurs when I try to use xpath.class.php with government
example
> in this case searching for Gerhard::
>
> phpXML error: While parsing an XPath expression there was an error in the
> predicate "Gerhard", because it was the null string. If you wish to seach
> for the empty string, you must use ''.
>
> Question
> ===========
> How can the string "Gerhard" be a "null string" ???
I only know how to use perl regexes, and have still not found a decent POSIX
reference despite 1 hour of searching the other day. Run the following
script:
<?php
echo "With 'Gehard'<br>\n";
echo 'result from ereg (using POSIX regexes) is:'.(ereg('^\w$',"Gerhard") ?
"true" : "false")."<br>\n";
echo 'result from preg_match (using PERL regexes)
is:'.(preg_match("/^\s*$/", "Gerhard") ? "true" : "false")."<br>\n";
echo "With ''<br>\n";
echo 'result from ereg (using POSIX regexes) is:'.(ereg('^\w$',"") ? "true"
: "false")."<br>\n";
echo 'result from preg_match (using PERL regexes)
is:'.(preg_match("/^\s*$/", "") ? "true" : "false")."<br>\n";
?>
I get an output of:
With 'Gehard'
result from ereg (using POSIX regexes) is:false
result from preg_match (using PERL regexes) is:false
With ''
result from ereg (using POSIX regexes) is:false
result from preg_match (using PERL regexes) is:true
Which shows to me that the regex is wrong. So change this line:
if (ereg('^\w*$', $predicate)) {
to:
if (preg_match("/^\s*$/, $predicate)) {
And let us all know if it works.
Nigel
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