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I've got posts that I want to echo after the post content the categories only if they're a child of a given parent category.

Example:

Parent category: Goal
Child categories of "Goal": brand awareness, brand engagement

If a post is categorized, I want it to echo out those category or categories:

<?php
    $categories = get_the_category();
    $seperator = ' ';
    $output = '';
    if($categories)
    {
        foreach($categories as $category) 
        {
            $output .= '<a href="'.get_category_link($category->term_id ).'" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '">'.$category->cat_name.'</a>'.$seperator;
        }
        echo trim($output, $seperator);
    }
?>

I'm using this, but it obviously outputs all categories, rather than just the ones that are children of the "goal" slug.

Edit: Current setup looks like this, but doesn't seem to be working. If I use the ID, it's fine:

<?php
        $categories = get_the_category();
        $seperator = ', ';
        $output = '<strong>GOAL:</strong> ';
        $category = get_category_by_slug('goal');
        if($categories)
        {
            foreach( $categories as $category ) 
            {
            if ( $category->parent == $category->term_id )
                $output .= '<a href="'.get_category_link($category->term_id ).'" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '">'.$category->cat_name.'</a>'.$seperator;
        }
        echo trim($output, $seperator);
}
?>
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4 Answers 4

Reset to default
1

Change:

$goal = get_category_by_slug('goal');
foreach($categories as $category) 
{
    $output .= '<a href="'.get_category_link($category->term_id ).'" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '">'.$category->cat_name.'</a>'.$seperator;
}

Into:

foreach( $categories as $category ) {
    if ( $category->parent == $goal->term_id)
        $output .= '<a href="'.get_category_link($category->term_id ).'" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '">'.$category->cat_name.'</a>'.$seperator;
}

Where you replace '123' with the ID of the Goal category.

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7
  • 2
    I had posted an answer where I used get_categories to get all Goals children using get_category_by_slug to grab goals ID. I would say this is much simpler and better - except the potential pitfall of hardcoding the term_id. Usually development environments are not the production environment - so you dont know the term_id before hand. So I still would suggest using get_category_by_slug('goal')->term_id to retrieve the ID.
    – eddiemoya
    Commented Aug 14, 2012 at 15:30
  • 1
    You're right. When it is a an production environment and the term ID is available, hardcoding might be better for perfomance reasons.
    – Jasper Denkers
    Commented Aug 14, 2012 at 16:34
  • @eddiemoya How do I update the above code to incorporate the get_category_by_slug('goal')->term_id instead of the ID?
    – Keefer
    Commented Aug 14, 2012 at 18:14
  • 1
    replace '123' in my code with $category->term_id and place $category = get_category_by_slug('goal'); before the if statement.
    – Jasper Denkers
    Commented Aug 14, 2012 at 18:56
  • @JasperDenkers - I added my newest code above (second snippet in my question). Doesn't seem to be working now. Did I put the if in the wrong place?
    – Keefer
    Commented Aug 14, 2012 at 19:17
1

I agree with the above answer except that it should use get_category_by_slug() instead of hardcoded ID's. The comments got sort of confusing to follow because the question was also changed - so I've split this out into my own answer.

To work this into the bit of logic you have above...

<?php
    $goal_id = get_category_by_slug('goal');

    $categories = get_the_category();
    $seperator = ' ';
    $output = '';
    if($categories)
    {
        foreach($categories as $category) 
        {
            if($category->parent == $goal->term_id){
                $output .= '<a href="'.get_category_link($category->term_id ).'" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '">'.$category->cat_name.'</a>'.$seperator;
            }
        }
        echo trim($output, $seperator);
    }
?>

I am assuming that the slug of your "Goal" category is simply goal.

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0

What about using a conditional check?

here's example which checks for parent category with ID (4).

Example -

//To show child  of cat with id - 4
if($category->category_parent == '4') 
    $output .= 'foo';
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2
  • Excuse me, you where quicker. Same solution. Btw, $category->category_parent is the same as $category->parent.
    – Jasper Denkers
    Commented Aug 14, 2012 at 15:16
  • taking my words back...
    – Amit Kosti
    Commented Aug 14, 2012 at 15:24
0

you could use get_the_category_list('',$category_id,$optional_post-ID)

http://codex.wordpress.org/Function_Reference/get_the_category_list

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