PHP：isset和！空的捷径？ [英] PHP: a short cut for isset and !empty?

问题描述

我想知道是否有更好的想法来解决下面的问题，

我有一个带有多个输入字段的表单，比如

 < input name =pg_titletype =textvalue =/> 
< input name =pg_subtitletype =textvalue =/> 
< input name =pg_descriptiontype =textvalue =/> 
< input name =pg_backdatetype =textvalue =/> 
等
  

但是有时在我的表单中不需要某些输入字段，例如，我只需要我的数据库注入的页面标题，

 < input name =pg_titletype =textvalue =/> 
等
  

我有另一个php页面来处理 $ _POST data，

  $ pg_title = null; 
 $ pg_subtitle = null; 
 $ pg_description = null; 
 $ pg_backdate = null; 
 
 if（isset（$ _ POST ['pg_title']）&&！empty（$ _ POST ['pg_title']））$ pg_title = $ _POST ['pg_title']; 
 if（isset（$ _ POST ['pg_subtitle']）&&！empty（$ _ POST ['pg_subtitle']））$ pg_subtitle = $ _POST ['pg_subtitle']; 
 if（isset（$ _ POST ['pg_description']）&&！empty（$ _ POST ['pg_description']））$ pg_description = $ _POST ['pg_description']; 
 if（isset（$ _ POST ['pg_backdate']）&&！empty（$ _ POST ['pg_backdate']））$ pg_backdate = $ _POST ['pg_backdate']; 
  

每次我都要检查 $ _ POST 不是空的，否则它的变量将被设置为 null ，这样我不会注入一个空的空间到我的分贝。

我发现 isset 和 $！$！
$ b

是否有任何默认的php函数到'缩短'上面的过程？或者我必须编写一个用户定义函数来处理这个问题？

或者有另外一种方法可以做到这一点？

感谢。

编辑：

非常感谢帮助。

只需在我的php页面中处理$ _POST数据的额外代码，

  $ sql =
 UPDATE root_pages 
 SET 
 pg_url =？，
 pg_title =？，
 pg_subtitle =？，
 pg_backdate =？，
 pg_description =？，
 ... 
 updated_by =？
 WHERE pg_id =？
; 
 
 $ result = $ connection-> run_query（$ sql，array（
 $ pg_url，
 $ pg_title，
 $ pg_subtitle，
 $ pg_backdate ，
 $ pg_description，
 ... 
 $ pg_id 
））; 
  

当您看到 $ pg_subtitle，$ pg_backdate，$ pg_description等总是出现在我的查询中。所以如果我得到 $ pg_subtitle =''而不是 $ pg_subtitle = null ，那么当我没有数据时，我的数据库记录将为该列有一个空的空间。

感谢： - ）

解决方案

你可以使用一个简单的函数

$ p $函数post_value_or（$ key，$ default = NULL）{
return isset（$ _ POST [$ key]）&& ！empty（$ _ POST [$ key]）？ $ _POST [$ key]：$ default;
}

然后使用：

  $ pg_title = post_value_or（'pg_title'）; 
 //或使用默认
 $ pg_title = post_value_or（'pg_title'，'无标题'）; 
  

I wonder if there any better ideas to solve the problem below,

I have a form with a number of input fields, such as,

<input name="pg_title" type="text" value="" />
<input name="pg_subtitle" type="text" value="" />
<input name="pg_description" type="text" value="" />
<input name="pg_backdate" type="text" value="" />
etc

But sometimes don't need certain input fields above in my form, for instance, I only need the page title for my db injection,

<input name="pg_title" type="text" value="" />
 etc

And I have another php page to handle the $_POST data,

$pg_title = null;
$pg_subtitle = null;
$pg_description = null;
$pg_backdate = null;

 if(isset($_POST['pg_title']) && !empty($_POST['pg_title']) ) $pg_title = $_POST['pg_title'];
 if(isset($_POST['pg_subtitle']) && !empty($_POST['pg_subtitle']) ) $pg_subtitle = $_POST['pg_subtitle'];
 if(isset($_POST['pg_description']) && !empty($_POST['pg_description']) ) $pg_description = $_POST['pg_description'];
 if(isset($_POST['pg_backdate']) && !empty($_POST['pg_backdate']) ) $pg_backdate = $_POST['pg_backdate'];

Every time I will have to check if the $_POST of certain input field is set and not empty, otherwise its variable will be set to null, so that I won't inject an empty space into my db.

I find the isset and !empty in the if-condition are very repetitive when I have a long list of variable to handle.

Is there any default php function to 'shorten' the process above? Or do I have to write an user define function to handle this?

Or maybe there is another way doing this?

Thanks.

EDIT:

Thanks so much guys for the help.

Just some extra code in my php page that handle the $_POST data,

$sql = "
    UPDATE root_pages
    SET 
        pg_url = ?, 
        pg_title = ?,
        pg_subtitle = ?,
        pg_backdate = ?,
        pg_description = ?,     
        ...
        updated_by = ?
    WHERE pg_id = ?
    ";

    $result = $connection->run_query($sql,array(
        $pg_url, 
        $pg_title,
        $pg_subtitle,
        $pg_backdate,
        $pg_description,        
        ...
        $pg_id
        ));

as you see that $pg_subtitle, $pg_backdate, $pg_description, etc always present in my query. so if I get $pg_subtitle = '' instead of $pg_subtitle = null when there is no data in it, my db record will have an empty space for that column.

Thanks :-)

解决方案

You can use a simple function

function post_value_or($key, $default = NULL) {
    return isset($_POST[$key]) && !empty($_POST[$key]) ? $_POST[$key] : $default;
}

Then use:

$pg_title = post_value_or('pg_title');
// OR with a default
$pg_title = post_value_or('pg_title', 'No Title');

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