...
add_filter( 'ul_ol_hook', 'ul_ol_func' );
<?php echo apply_filters('ul_ol_hook', $tblock_textarea); ?>
$string = '[{"count":1,"img":"/img/789.jpg","title":"Перчатки трикотажные","price":8,"id":"197299_65366_2"}]';
$array = json_decode($string, true);
/*
Array
(
[0] => Array
(
[count] => 1
[img] => /img/789.jpg
[title] => Перчатки трикотажные
[price] => 8
[id] => 197299_65366_2
)
)
*/