Question

i am using PHP scripts to implement this…

    $keyword=array('local news','art','local','world','tech','entertainment','news','tech','top stories','in the news','front page','bbc news','week in a glance','week in pictures','top stories');

   //$keyword has predefined array of strings

    $all_meta_tags=get_meta_tags("http://abcnews.go.com/"); 
    $array=$all_meta_tags['keywords'];//store 'keyword' attribute values in $keyword_meta

Now i have to match contents of $array with $keyword…..the results should give me matched items of $array which are present in $keyword

any help plz…?

can array matching/intersection be done case insensitively??
i mean if
$keyword=array(‘local news’);
$array = ‘Local News, International News’;
var_dump(array_intersect(preg_split(‘/,\s*/’, $array), $keyword));

then it won’t match ‘Local News’…can you tel me hw to do it if it is possible??

Answer 1

$inBoth = array_intersect(preg_split('/,\s*/', $array), $keyword);

CodePad.

get_meta_tags() just returns the keywords as a string, so we need to split it into an array. We take into account people adding spaces, newlines or tabs after the ,.

You could also skip the regex, and explode on , and then use array_map('trim', $array).

Without doing this, you run the risk of "art" and " art" not matching.

Update

can array matching be done case insensitively?

If you don’t mind the resulting arrays being lowercase, you could use array_map('strtolower', $array) on both arrays before using array_intersect().

Otherwise, this will do it…

$metaKeywords = preg_split('/,\s*/', $array);
$matches = array();
foreach($keyword as $keyword) {
  foreach($metaKeywords as $value) {
     if (strtolower($value) == strtolower($keyword)) {
        $matches[] = $keyword;
     }
  }
}

$matches will have keywords in both arrays case insensitively.

If you have multibyte strings, use mb_strtolower() or equivalent.