MySQL选择PHP数据而不将其发布到Wordpress

Question

I'm using Wordpress(last)

I try to Echo SUM(feed) from SQL table in the archive loop where all posts of specific category shown

<section category="category1">
...
<?php get_template_part( 'entry_category' ); ?>
<?php endwhile; endif; ?>
</section>

In my entry_category i've got basic HTML tags to output an article and my function to echo SUM(feed)

<article>...
<?php bankTotal(the_title);?>
</article>

And here is the function in my function.php

function bankTotal($bank_name){
global $wpdb;
$result = $wpdb->get_results($wpdb->prepare("SELECT SUM(feed) FROM feeds_table WHERE bank_name='$bank_name'"));
print_r($result);

I understand that I Need to $_POST $bank_name to a function. But is there a way to do so WITHOUT $_POST ? Something like bankTotal($bank_name)

I'l need to show SUM(feed) for each <Article>...</article> of a <section>

Is there a way to pass the $bank_name to a function without using ajax($_POST['bank_name'];)?

SQL table looks like this:

bank_name | segment_name | feed |
---------------------------------
bank-A    | segmentB     | 12   |
bank-A    | segmentC     |  2   |
.................................
bank-X    | segmentA     | 32   |

***SOLVED(thanks to Seti) UPD: If you are trying to ECHO out SUM(row) do it like this

function bankTotal($bank_name){
global $wpdb;
$result = $wpdb->get_results($wpdb->prepare("SELECT SUM(feed) AS someTotal FROM feeds_table WHERE bank_name='$bank_name'", ARRAY_N));
foreach($result as $row){
echo "$row->someTotal";
}
}

Answer 1

Change your code part to

<article>
    ...
    <?php bankTotal(get_the_title());?>
</article>

get_the_title() returns the title, while you used the_title() and that was printing title therefore not giving anything to the function;

Also read a bit about $wpdb->prepare() as you should use it to filter data