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Filter custom field post meta on category page WordPress


Extended explanation: I'm using post meta inside a loop on the category page to display thumbnails and I'd like to filter it so I can replace certain width values. E.g. if width="50" change it to width="75".

(I'm using a basic function with str_replace to add/replace by applying it to the the_content which works perfectly.)

How can I easily target the get_post_meta in the category page using a function?

(I'm online now and can test this quickly this. If all goes well I also have another question.)

Answers (5)


Luis Abarca answers:

Had you try to use CSS ??

.thumnail {
width: 50px;
height: 75px;

Ina comments:

Hi Luis,

Thanks but I think it's a little more complex than just overriding it with CSS.

Ina comments:

I apologise and I stand corrected.

I didn't think I could target it and I'd had trouble before.


Francisco Javier Carazo Gil answers:

Hello Ina,

I don't understand you. You are saving a post_meta into a category page and you want to change this meta?

If it is correct, use the next one:
update_post_meta($post_id, $meta_key, $meta_value, $prev_value);

To get the ID of page:
$id = $wp_query->post->ID;

Ina comments:

Sorry if the question sounded rather vague but basically I have a custom field has images or video code dropped into it. Rather worry about editing individual dimensions, I'd just like to say target a width or a height using a function.

I can do it using a str_replace because obviousy I can target the_content, but these fields are being used on the Category page.

I hope that makes more sense.

Francisco Javier Carazo Gil comments:

Hi Ina,

You can directly use CSS as Luis says.

Another option, if you want to set the width into post_meta directly is SELECT all registers and UPDATE the registers you want.

$my_meta = 'metea';
$allmiles = $wpdb->get_results(
FROM $wpdb->postmeta
WHERE meta_key = %s
) ;

foreach($registers as $register)

Where your condition is a function where you:
* See if the information is a image
* Make any other checks

Ina comments:

Thank you for the fast response.

If you're suggesting as Luis that I can just use CSS, how do I override the width of an embedded video?

Francisco Javier Carazo Gil comments:


If you are using videos with <object> tag, you can also use CSS."50px"

But you can also do the other method and this way change the value saved. The condition would be something like:


And the UPDATE with the new value in the string. Remember to set height proportionally.


Julio Potier answers:


You can use an OutputBuffer code kind, i'll explain.

Ina comments:

Please do.


Arnav Joy answers:

what are you getting from get_post_meta

can you write syntax here for get_post_meta()

or please explain your question further.

Ina comments:

Hi Robin,

Please see my answer above. I hope that makes more sense.

Arnav Joy comments:

so you giving path of video or image in custom field.

Ina comments:

Yes, that's right.

The field will either have

<img src...



I just wasn't sure of my approach, since I didn't really think of it in terms of updating the field. I was thinking more along the lines of replacing certain strings using a function.

Perhaps the confusion is from the fact that you can easily target the_content or the_excerpt but this is on the category page.


S├ębastien | French WordpressDesigner answers:

why do you not use the function [[LINK href=""]]the_post_thumbnail[[/LINK]] ??!

For example you can use
the_post_thumbnail( array(100,100) );
to have a thumb 100px X 100px
it's easy !