CODEWITHSUNDEEP
phpwordpress
Sara44
Sara44

Reputation: 422

Filter to check for keyword and display sidebar content accordingly

Within Wordpress, is it possible to read the content of a post and look for keywords, then display sidebar content accordingly? Example:

If post content contains the word 'cheese' then don't display sidebar advert, otherwise do.

For extra information, I have >500 posts so would not want to add a tag or custom field to every post.

I'd include examples of code but I'm really not sure whether to start with a regex in functions.php and if so, what do I then look for in the sidebar code?

Thanks in advance.

UPDATE 1 - Stripos seems faster than regex for this purpose Stripos on php.net so I used this.

UPDATE 2 - My current setup... In index.php (or page.php etc depending on theme):

    <?php
    if( has_keyword() ) {
        get_sidebar( 'special' );
    } else {
        get_sidebar( 'normal' );
    }
    ?>

and in functions.php

function has_keyword ()
{
    global $post;

    $mywords = array('word1', 'word2', 'word3');
    foreach($mywords as $word){

        // return false if post content does not contain keyword
        if( ( stripos( $post->post_content, $word ) === false ) ) {
        return false;
        };
    };
        // return true if it does
        return true;
}; //end function

I need to get the foreach function working, there is something wrong in there. I tried to use 'break' on successfully finding a word but I need to return 'false' as well, that's why I added the if condition. Not sure how to do this.

Upvotes: 0

Views: 692

Answers (3)

diggy
diggy

Reputation: 6838

You could use PHP's stripos. Define a custom conditional tag in functions.php:

function has_keyword( $keyword )
{
    // only check on single post pages
    if( ! is_singular() )
        return false;

    global $post;

    // return false if post content does not contain keyword
    if( ( stripos( $post->post_content, $keyword ) === false ) )
        return false;

    // return true if it does
    return true;
}

Then, in your template file:

if( has_keyword( 'my_keyword' ) )
    get_sidebar( 'normal' );
else
    get_sidebar( 'special' );

update

To check for multiple keywords (see comments):

function has_keyword()
{
    if( ! is_singular() )
        return false;
    global $post;
    $keywords = array( 'ham', 'cheese' );
    foreach( $keywords as $keyword )
        if( stripos( $post->post_content, $keyword ) )
            return true;
    return false;
}

Upvotes: 5

M Khalid Junaid
M Khalid Junaid

Reputation: 64476

you can also use preg_match to find exact keyword match in the string like

function check_keyword($keyword){

global $post;

if(!is_single() ){

return false;

}else{

$result = preg_match('/\b('.$keyword.')\b/', $post->post_content);

if($result){

return true;

}else{

return false;

}


}

}

To get side_bar

Call check_keyword()

if (check_keyword('cheese')) {
get_sidebar('cheese');
} else {
get_sidebar('no-ads');
}

See for reference preg_match() Hope it makes sense

Upvotes: 1

0x6563
0x6563

Reputation: 1086

If you want to verify against a list of words, you could use this function below, which will return false if any of the words are found in your $content else it will return true. So as to say go ahead and display them ads.

function displayAds($content){
    $words = array('cheese', 'ham', 'xxx');
    foreach($words as $word){
       if(preg_match('/\s'.$word.'\s/i', $content)){
          return FALSE;
       };
    };
    return TRUE;
 };

then in your index.php you can do as your outloud thinking in your Update. Naturally changing function names to reflect your choice of naming.

Upvotes: 1

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