WordPress - Get posts base on ratio percentage per category

wordpres-get-posts-base-on-category-ratio.php

<?php

/**
 * Category Ratio: Get Posts base on Custom % per category it means that each category.
 *
 * Get Category ratio from Settings like below.
 * $category_ratio = array(category_id for selected category => inserted category ratio);
 *
 * NOTE: Most important the total of category ratio for all the selected categories must be 100% 
 * (this you need to set using JavaScript logic on back admin) otherwise it will create problem.
 */

# Example 1
# 	 Category A    20%
#    Category B    20%
#    Category C    60%
//$category_ratio = array(41 => 20, 43 => 20, 38 => 60);

# Example 2
#    Category A    20%
#    Category B    20%
#    Category C    35%
#    Category D    25%
$category_ratio = array(41 => 20, 43 => 20, 38 => 35, 39 => 25);

// Now base on the categories selected calculate total posts found
$posts = get_posts(array('posts_per_page' => -1, 'category' => array_keys($category_ratio)));
$total_rows_found = count($posts);

/*
 * Base on category ratio and found total post we need to find how many posts for each selected category above will come?
 */ 
$foreach_category_count = [];
foreach($category_ratio as $category_id => $ratio)
{
	// Get category count base on their ratio
	$foreach_category_count[$category_id] = round($ratio * $total_rows_found/ 100, 0, PHP_ROUND_HALF_DOWN);
}

// Logic summery
print_r($category_ratio);
echo 'Total rows found : ' . $total_rows_found . "\n";
print_r($foreach_category_count);


/**
 * Since we have count for each category base on their ratio, 
 * We now get posts for each category_id and count we calculate above and
 * Set all post in a Single Array.
 */
$posts = [];
foreach($foreach_category_count as $category_id => $count)
{
	// Get posts base on category_id and their count we calculated.
	$get_posts = get_posts(array('posts_per_page' => $count, 'category' => $category_id));
	
	// Merge all the found posts in a single array.
	$posts = array_merge($posts, $get_posts);
}

// Print posts summary
print_r($posts);

# Now you can apply your business logic to display images for the posts found here.