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@ 2014-03-24T13:02:37Z

<?php
$array['meta_query'][] =  array(
          'key' => 'price',
          'compare' => 'NOT EXISTS',
          'value' => '',
        );
print_r($array);

Output
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print_r: documentation ( source)

preferences:dark modelive preview

47.21 ms | 405 KiB | 6 Q