wordpress - Prevent PHP variable from automatically displaying on the page -

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i'm having strange occurrence haven't seen before. have created following variable:

$post_type = the_field('select_post_type');

so can use variable in other code (using wordpress advanced custom fields). however, @ point write line of code, outputs value onto page. query working correctly, reading variable otherwise. haven't seen variable before... ideas why or how can fix it?

here full code context:

<?php $post_type = the_field('select_post_type');  // variable outputting onto page right here  $args = array(     'post_type' => $post_type,      'posts_per_page' => '-1', ); $query = new wp_query( $args ); ?>

i've used variables in wordpress queries before , haven't had happen, i'm not sure why happening?

the_field automatically echo's use get_field instead


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