wordpress - ACF plugin finding ID for image for PHP to display in page -

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i have wordpress site using acf plugin.

what i'm trying achieve this:

using plugin allow php in posts, trying code display image using shortcode given acf

what have far is

<?php echo wp_get_attachment_image( 'id' ) ?>    displays image need  <?php the_field('mobile_poster'); ?>    displays id image

what hasn't worked has been using 

<?php echo wp_get_attachment_image( '[acf field="mobile_poster"] ') ?>

any ideas on how achieve appreciated.

kind regards,

ben

you can try shortcode:

<?php echo do_shortcode( '[acf field="{$field_name}" post_id="{$post_id}"]' ) ?>

for display acf field value

if trying find image have id of custom field can write code

<?php  $attachment_id = do_shortcode( '[acf field="{$field_name}"]' ) ; wp_get_attachment_image_src( $attachment_id );  ?>

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