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網(wǎng)站表單自定義參數(shù)之單文件字段不顯示

創(chuàng)建表單自定義參數(shù)之單文件字段，開發(fā)者工具創(chuàng)建的字段

<div class="form-group">
    <label class="col-md-2 control-label">單文件</label>
    <div class="col-md-10">
        <?php echo dr_fieldform('{"name":"file","fieldname":"banner","ismain":"1","fieldtype":"File","setting":{"option":{"fieldtype":"","fieldlength":"","input":"1","ext":"jpg,gif,png,jpeg","size":"2","attachment":"0","image_reduce":"","is_ext_tips":"0","css":""},"validate":{"required":"0","pattern":"","errortips":"","check":"","filter":"","formattr":"","tips":""}},"ismember":"1"}', $file, 1, 1);?>
    </div>
</div>

最后顯示成功，上傳文件保存后，又沒了？哪不對？