move_uploaded_file（）无法正常工作。我能做什么？

Question

上传的文件未保存在“图片”文件夹中

<?php 


      if(isset($_POST['create_post'])) {

            $post_title        = $_POST['title'];
            $post_author       = $_POST['author'];
            $post_category_id  = $_POST['post_category_id'];
            $post_status       = $_POST['post_status'];

            $post_image        = $_FILES['image']['name'];
            $post_image_temp   = $_FILES['image']['tmp_name'];


            $post_tags         = $_POST['post_tags'];
            $post_content      = $_POST['post_content'];
            $post_date         = date('d-m-y');
    \

move_uploaded_file($post_image_temp, "../images/$post_image") ;

}
 ?>



<form action="" method="post" enctype="multipart/form-data">


    <div class="form-group">
        <label for="title">Post title</label>
        <input type="text" class="form-control" name="title">
    </div>

    <div class="form-group">
        <label for="post_category">Post Category Id</label>
        <input type="text" class="form-control" name="post_category_id">
    </div>
    <div class="form-group">
        <label for="post_author">Post Author</label>
        <input type="text" class="form-control" name="author">
    </div>
    <div class="form-group">
        <label for="post_status">Post Status</label>
        <input type="text" class="form-control" name="post_status">
    </div>
    <div class="form-group">
        <label for="post_image">Post Image</label>
        <input type="file" name="image">
    </div>
    <div class="form-group">
        <label for="post_tags">Post Tags</label>
        <input type="text" class="form-control" name="post_tags">
    </div>
    <div class="form-group">
        <label for="post_content">Post Content</label>
        <textarea class="form-control" name="post_content" id="" cols="30" rows="10"></textarea>
    </div>
    <div class="form-group">

        <input type="submit" class="btn btn-primary" name="create_post" value="Publish Post">
    </div>


</form>