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In my plugin, I use these instructions to obtain a list of posts:

$args = array(
    'numberposts'     => -1,
    'offset'          => 0,
    'meta_query' => array(
            'key' => 'metadata1',
            'value' => '80',
            'compare' => '<=',
            'type' => 'UNSIGNED'
            'key' => 'metadata2',
            'value' => '4.6',
            'compare' => '<=',
            'type' => 'DECIMAL'
    'post_type'       => 'post',
    'post_status'     => 'publish',
    'suppress_filters' => true );

$posts = get_posts($args);

foreach ($posts as $post) {
    // some work on $post

How can I order these posts by metadata1 ascending or by metadata2 ascending? (Note that metadata1 is an unsigned integer number, and metadata2 is a decimal number.)

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up vote 6 down vote accepted

Try meta_value_num

'meta_key' => 'metadata1',
'orderby' => 'meta_value_num'

Add these 2 parameters to $args. This does the sorting considering metadata1 as numeric

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Also, if you can't get this to work with get_posts, I'd recommend switching to WP_Query.

As Mridul said above, to sort based on numbers, you need to specify the 'meta_value_num' to 'orderby' parameter. However, I'm not certain that you can do this with a standard get_posts() call.

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