Order posts by Title length in WP_QUERY - wordpress

Question

I am having problem ordering the posts based on the title length. Here is my code:
<?php
$terms = get_terms(array(
'taxonomy' => 'vendor_category',
'slug' => 'venues',
'hide_empty' => false
));
?>
<?php
foreach ($terms as $term) {
$eventargs = array(
'post_type' => 'vendor',
'posts_per_page' => -1,
'orderby' => 'title',
'order' => 'ASC',
'meta_key' => 'primary_category',
'meta_value' => $term->term_id,
);
$eventqry = new WP_Query($eventargs);
?>
How can i sort the posts based on the title length in ascending order.

Answer 1

You can save title length in post meta on save_post hook. and then you can retrieve post order by post meta value.
You can use save_post hook to save the post meta. put this code in your active theme.
//for existing vendors
add_action('admin_init', 'udpate_existing_vendor');
function udpate_existing_vendor(){
$existing_vendor_updated = get_option('existing_vendor_updated', 'no');
if( $existing_vendor_updated == 'no' ){
$vendor_args = array(
'post_type' => 'vendor',
'post_status' => 'publish',
'posts_per_page' => -1
);
$vendors = new WP_Query( $vendor_args );
if( $vendors->have_posts() ) {
while ( $vendors->have_posts() ) { $vendors->the_post();
$length = strlen( get_the_title() );
update_post_meta( get_the_ID(), 'title_length', $length );
} wp_reset_postdata();
}
update_option('existing_vendor_updated', 'yes');
}
}
// for new vendor
function save_vendor_title_length( $post_id ) {
$length = strlen( get_the_title( $post_id ) );
update_post_meta( $post_id, 'title_length', $length );
}
add_action( 'save_post_vendor', 'save_vendor_title_length');
Here your query will look like.
$terms = get_terms(array(
'taxonomy' => 'vendor_category',
'slug' => 'venues',
'hide_empty' => false
));
foreach ($terms as $term) {
$eventargs = array(
'post_type' => 'vendor',
'posts_per_page' => -1,
'orderby' => 'meta_value_num',
'order' => 'ASC',
'meta_key' => 'title_length'
);
$eventqry = new WP_Query( $eventargs );
}