如何使Xpath搜索不区分大小写

Question

I'm currently making a xpath search, I've got the the search working but I need to make it case insensitive. The xml file I'm using is 1.0 which from my research means I've got to use some thing called a translate function but I'm unsure of how to do this.

Here is my search file :

$holidayDoc = simplexml_load_file('holidays.xml');      

// fetch data from form
$txtSearch = $_GET['txtSearch'];

$qry = "//channel/item[contains(.,\"$txtSearch\")]";


$holidays = $holidayDoc->xpath($qry);   // do the xpath query 
// now loop through all the students

echo "Showing title search results for $txtSearch";

foreach ($holidays as $holiday) 
{

 echo "<p><a href=\"{$holiday->link}\">{$holiday->title}</a></p>
    <p><small>$holiday->pubDate</small></p>";

Any help would be greatly appreciated thanks.

Answer 1

XPath 1.0 :

$qry = "//channel/item[contains(
 translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'),  
 translate($search, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'))]"

XPath 2.0 :

$qry = "//channel/item[lower-case(.) = lower-case($search)]"

Both replace all upper case to lower case.

Answer 2

The currently accepted answer is flawed -- because nothing guarantees that the second argument of contains() is already converted to lower case .

Also, it uses '$search' -- and this is literally the string "$search" -- not the variable $search .

Here is a correct solution :

//channel/item
   [contains(translate(., 
                       'ABCDEFGHJIKLMNOPQRSTUVWXYZ', 
                       'abcdefghjiklmnopqrstuvwxyz'),
             translate($txtSearch, 
                       'ABCDEFGHJIKLMNOPQRSTUVWXYZ', 
                       'abcdefghjiklmnopqrstuvwxyz')
             )
   ]

The corresponding XPath 2.0 expression :

//channel/item[contains(lower-case(.), lower-case($txtSearch))]

Update :

Based on this solution, @alain.janinm has corrected his answer.

Answer 3

Technically, to do a case-blind comparison you should use a case-blind collation, unless your text happens to be English; normalizing both operands to upper case or to lower case does not give the correct result in all circumstances. Unfortunately collation names (in XPath 2.0) aren't standardised so you have to look in your product documentation to see what collations are available.

Answer 4

A case insensitive search can be using using the matches function like so

$qry = "//string[text() [matches(.,'^stringImTryingToFind$','i')]]"

the //string[text() [matches(.,'^OK$','i')]] section of the query uses regular expressions (REGEX) to determine a match.