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內(nèi)容關(guān)聯(lián)字段變量模塊名稱如何調(diào)用

使用開發(fā)者工具創(chuàng)建的模塊內(nèi)容關(guān)聯(lián)字段，

<?php echo dr_fieldform('{"name":"關(guān)聯(lián)文章","fieldname":"news_id","ismain":"1","fieldtype":"Related","setting":{"option":{"module":"news","title":"文章名稱","limit":"1","pagesize":"","css":""},"validate":{"required":"0","pattern":"","errortips":"","check":"","filter":"","formattr":"","tips":""}},"ismember":"1"}', $product_id, 1, 1);?>

放在后臺模板中，

但是關(guān)聯(lián)的模塊名稱是變量的

{php $news_module = 'news';} //其它方式控制

如下這樣無效，

:{"module":{$news_module},"title":"產(chǎn)品名稱"

請問該如何實現(xiàn)呢