How to loop within a loop in WordPress? - wordpress

Question

How can I run a loop within a loop in WordPress?
My attempt is this so far but it seems to crash the server each time.
<?php $loop = new WP_Query( array('post_type' => 'careers', 'posts_per_page' => '10', 'meta_key' => 'company', 'meta_value' => get_field('company') )); ?>
<?php $loop2 = new WP_Query( array('post_type' => 'jobs', 'posts_per_page' => '-1', 'meta_key' => 'company', 'meta_value' => get_field('company') ));?>
<?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
<?php $i = 0; while ( $loop2->have_posts() ) : $loop->the_post(); $i++; ?>
<?php echo $i ?>
<?php endwhile; wp_reset_query(); update_field('jobscounter', $i); ?>
<?php endwhile; wp_reset_query(); ?>

Answer 1

In PHP, you can open a code section by <?php and close it later with ?>. With that in mind, you can place all your code in multiple lines without opening and closing the <?php ?> block over and over.
Example:
<?php
$loop = new WP_Query(array(
'post_type' => 'careers',
'posts_per_page' => '10',
'meta_key' => 'company',
'meta_value' => get_field('company')
));
$loop2 = new WP_Query(array(
'post_type' => 'jobs',
'posts_per_page' => '-1',
'meta_key' => 'company',
'meta_value' => get_field('company')
));
while ($loop->have_posts()):
$loop->the_post();
$i = 0;
while ($loop2->have_posts()):
$loop2->the_post();
$i++;
echo $i;
endwhile;
wp_reset_query();
update_field('jobscounter', $i);
endwhile;
wp_reset_query();
?>
Note: you where missing a semicolon ; after the echo $i
Note 2: the second loop should use $loop2-> instead of $loop->
Then, you should do something with the data you process in each iteration. If you don't want to just count the total entries. :)
For example:
while ($loop2->have_posts()):
$loop2->the_post();
$i++;
$post_title = $loop2->the_title(); // <--- Getting the title :)
echo $post_title . "\n";
endwhile;