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Do you want to limit the number of CSS classes the post_class function outputs when called? This will limit the number of CSS classes WordPress adds to a post.

Place this code in your theme’s functions.php file or create a custom plugin with this code:

/**
 * Custom function to limit the number of classes output by the post_class function
 */
function limit_number_of_classes( $classes ) {
  // Limit the number of classes to 3
  $number_of_classes_allowed = 3;
  $classes = array_slice( $classes, 0, $number_of_classes_allowed );
  return $classes;
}
add_filter( 'post_class', 'limit_number_of_classes', 10, 1 );

This code limits the number of classes output by WordPress’s ‘post_class’ function. The ‘post_class’ function is a built-in WordPress function that adds classes to the post element in your theme. By default, the ‘post_class’ function outputs many classes, which can be overwhelming and unnecessary for some users.

The ‘limit_number_of_classes’ function is a custom function that takes one argument: $classes. The $classes argument is an array of post-classes.

Inside the function, the ‘array_slice’ function is used to slice the $classes array and return only the first three elements. This limits the number of classes output by the ‘post_class’ function to three. Finally, the function is hooked to the ‘post_class’ filter using the ‘add_filter’ function, which applies the changes to the post classes.

This code will limit the number of classes output by the ‘post_class’ function to three on your WordPress site. If desired, you can modify the code to limit the number of classes to a different value.