Wordpress 插件开发 - 文件上传：如何允许指定的文件类型？

Question

这是允许将图像上传到网站根目录的代码。是管理区的子菜单页面，调用一个函数，函数体如下：

 <div class="wrap">
<h2>Upload files</h2><br><br><br>
<form action="" method="post" enctype="multipart/form-data">
<input type="file" class="button" name="fileToUpload" id="fileToUpload">
<input type="submit" class="button button-primary" value="Upload File" name="submit">
</form>
</div>
<?php
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $target_dir = get_home_path();//wp_upload_dir();
    $target_file = get_home_path() . '/' . basename($_FILES["fileToUpload"]["name"]);
    $uploadOk = 1;
    $imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        ?>
        <div id="setting-error-settings_updated" class="updated settings-error notice is-dismissible">
        <strong>File is an image</strong>
        </div>
        <?php
        $uploadOk = 1;
    } else {
         ?>
        <div id="setting-error-settings_updated" class="updated settings-error notice is-dismissible">
        <strong>File is not an image</strong>
        </div>
        <?php
        $uploadOk = 0;
    }
    // Check if file already exists
    if (file_exists($target_file)) {
         ?>
        <div id="setting-error-settings_updated" class="updated settings-error notice is-dismissible">
        <strong>File already exists.</strong>
        </div>
        <?php
        $uploadOk = 0;
    }
    // Check file size
    if ($_FILES["fileToUpload"]["size"] > 500000) {
          ?>
        <div id="setting-error-settings_updated" class="updated settings-error notice is-dismissible">
        <strong>Your file is too large.</strong>
        </div>
        <?php
        $uploadOk = 0;
    }
    // Allow certain file formats
    if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != 
        "jpeg"
    && $imageFileType != "gif" ) {
          ?>
        <div id="setting-error-settings_updated" class="updated settings-error notice is-dismissible">
        <strong>Sorry, only JPG, JPEG, PNG & GIF files are allowed.</strong>
        </div>
        <?php
        $uploadOk = 0;
    }
    // Check if $uploadOk is set to 0 by an error
    if ($uploadOk == 0) {
          ?>
        <div id="setting-error-settings_updated" class="updated settings-error notice is-dismissible">
        <strong>Sorry, your file was not uploaded.</strong>
        </div>
        <?php
        // if everything is ok, try to upload file
    } else {
        if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {                 
             ?>
        <div id="setting-error-settings_updated" class="updated settings-error notice is-dismissible">
        <strong>The file has been uploaded.</strong>
        </div>
        <?php

        } else {
            echo "Sorry, there was an error uploading your file.";
        }
    }

}

我想允许这些文件类型而不是图像：.xml、.rar、.zip、.txt。我尝试使用函数getfilesize() 更改函数getimagesize() 并更改// Allow certain file formats 注释下方的文件扩展名。但它不起作用。您知道我应该怎么做才能允许上传这些文件类型而不是当前允许上传的文件类型吗？

Answer 1

基本上...

$allowed_extenstions=array('jpg','png','pdf','zip');

    $ext = pathinfo(esc_attr($_FILES['file']['name']), PATHINFO_EXTENSION);
            if (!in_array($ext,$allowed_learning_extenstions))
            {
                echo "invalid_file_type";
                die();
            }

`