3 replaced http://wordpress.stackexchange.com/ with https://wordpress.stackexchange.com/
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I am looking for something very similar to this questionthis question. However, the answer provided there seems strange to me. I don't know what the arguments posts_per_page=-1 and it seems more like a hack to me than an actual solution.

I tried the following, which loops the first 6 categories and it works great. However, I want to exclude some categories from this, for instance 1 and 4. I am not entirely sure how to approach this.

<div id="category-posts-content">

    <?php $i = 0; while ($i < 7) : ?>
        <?php query_posts('cat='.$i.'&posts_per_page=3'); ?>
            <?php if ( have_posts() ) : ?>
                <div class="subject">
                    <h3><?php single_cat_title(); ?></h3>
                    <ul>
                    <?php while ( have_posts() ) : the_post(); ?>
                        <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>            
                    <?php endwhile; ?>
                    </ul>
                </div>
            <?php endif; ?>
       <?php $i++; ?>
    <?php endwhile; ?>
    <?php wp_reset_query(); ?>
</div>

NOTE: some posts belong into more than one category!

I am looking for something very similar to this question. However, the answer provided there seems strange to me. I don't know what the arguments posts_per_page=-1 and it seems more like a hack to me than an actual solution.

I tried the following, which loops the first 6 categories and it works great. However, I want to exclude some categories from this, for instance 1 and 4. I am not entirely sure how to approach this.

<div id="category-posts-content">

    <?php $i = 0; while ($i < 7) : ?>
        <?php query_posts('cat='.$i.'&posts_per_page=3'); ?>
            <?php if ( have_posts() ) : ?>
                <div class="subject">
                    <h3><?php single_cat_title(); ?></h3>
                    <ul>
                    <?php while ( have_posts() ) : the_post(); ?>
                        <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>            
                    <?php endwhile; ?>
                    </ul>
                </div>
            <?php endif; ?>
       <?php $i++; ?>
    <?php endwhile; ?>
    <?php wp_reset_query(); ?>
</div>

NOTE: some posts belong into more than one category!

I am looking for something very similar to this question. However, the answer provided there seems strange to me. I don't know what the arguments posts_per_page=-1 and it seems more like a hack to me than an actual solution.

I tried the following, which loops the first 6 categories and it works great. However, I want to exclude some categories from this, for instance 1 and 4. I am not entirely sure how to approach this.

<div id="category-posts-content">

    <?php $i = 0; while ($i < 7) : ?>
        <?php query_posts('cat='.$i.'&posts_per_page=3'); ?>
            <?php if ( have_posts() ) : ?>
                <div class="subject">
                    <h3><?php single_cat_title(); ?></h3>
                    <ul>
                    <?php while ( have_posts() ) : the_post(); ?>
                        <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>            
                    <?php endwhile; ?>
                    </ul>
                </div>
            <?php endif; ?>
       <?php $i++; ?>
    <?php endwhile; ?>
    <?php wp_reset_query(); ?>
</div>

NOTE: some posts belong into more than one category!

2 added 54 characters in body
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I am looking for something very similar to this question. However, the answer provided there seems strange to me. I don't know what the arguments posts_per_page=-1 and it seems more like a hack to me than an actual solution.

I tried the following, which loops the first 6 categories and it works great. However, I want to exclude some categories from this, for instance 1 and 4. I am not entirely sure how to approach this.

<div id="category-posts-content">

    <?php $i = 0; while ($i < 7) : ?>
        <?php query_posts('cat='.$i.'&posts_per_page=3'); ?>
            <?php if ( have_posts() ) : ?>
                <div class="subject">
                    <h3><?php single_cat_title(); ?></h3>
                    <ul>
                    <?php while ( have_posts() ) : the_post(); ?>
                        <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>            
                    <?php endwhile; ?>
                    </ul>
                </div>
            <?php endif; ?>
       <?php $i++; ?>
    <?php endwhile; ?>
    <?php wp_reset_query(); ?>
</div>

NOTE: some posts belong into more than one category!

I am looking for something very similar to this question. However, the answer provided there seems strange to me. I don't know what the arguments posts_per_page=-1 and it seems more like a hack to me than an actual solution.

I tried the following, which loops the first 6 categories and it works great. However, I want to exclude some categories from this, for instance 1 and 4. I am not entirely sure how to approach this.

<div id="category-posts-content">

    <?php $i = 0; while ($i < 7) : ?>
        <?php query_posts('cat='.$i.'&posts_per_page=3'); ?>
            <?php if ( have_posts() ) : ?>
                <div class="subject">
                    <h3><?php single_cat_title(); ?></h3>
                    <ul>
                    <?php while ( have_posts() ) : the_post(); ?>
                        <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>            
                    <?php endwhile; ?>
                    </ul>
                </div>
            <?php endif; ?>
       <?php $i++; ?>
    <?php endwhile; ?>
    <?php wp_reset_query(); ?>
</div>

I am looking for something very similar to this question. However, the answer provided there seems strange to me. I don't know what the arguments posts_per_page=-1 and it seems more like a hack to me than an actual solution.

I tried the following, which loops the first 6 categories and it works great. However, I want to exclude some categories from this, for instance 1 and 4. I am not entirely sure how to approach this.

<div id="category-posts-content">

    <?php $i = 0; while ($i < 7) : ?>
        <?php query_posts('cat='.$i.'&posts_per_page=3'); ?>
            <?php if ( have_posts() ) : ?>
                <div class="subject">
                    <h3><?php single_cat_title(); ?></h3>
                    <ul>
                    <?php while ( have_posts() ) : the_post(); ?>
                        <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>            
                    <?php endwhile; ?>
                    </ul>
                </div>
            <?php endif; ?>
       <?php $i++; ?>
    <?php endwhile; ?>
    <?php wp_reset_query(); ?>
</div>

NOTE: some posts belong into more than one category!

1
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Display category title and three latest post inside the category

I am looking for something very similar to this question. However, the answer provided there seems strange to me. I don't know what the arguments posts_per_page=-1 and it seems more like a hack to me than an actual solution.

I tried the following, which loops the first 6 categories and it works great. However, I want to exclude some categories from this, for instance 1 and 4. I am not entirely sure how to approach this.

<div id="category-posts-content">

    <?php $i = 0; while ($i < 7) : ?>
        <?php query_posts('cat='.$i.'&posts_per_page=3'); ?>
            <?php if ( have_posts() ) : ?>
                <div class="subject">
                    <h3><?php single_cat_title(); ?></h3>
                    <ul>
                    <?php while ( have_posts() ) : the_post(); ?>
                        <li><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>            
                    <?php endwhile; ?>
                    </ul>
                </div>
            <?php endif; ?>
       <?php $i++; ?>
    <?php endwhile; ?>
    <?php wp_reset_query(); ?>
</div>