基于字符串动态创建PHP对象 [英] Dynamically create PHP object based on string

问题描述

我想在PHP中根据MySQL数据库中的字符串定义的类型创建一个对象。数据库表具有列和样本数据：

I would like to create an object in PHP based on a type defined by a string in a MySQL database. The database table has columns and sample data of:

 id | type | propertyVal
----+------+-------------
  1 | foo  | lorum
  2 | bar  | ipsum

... PHP数据类型

...with PHP data types

class ParentClass {...}
class Foo extends ParentClass {private $id, $propertyVal; ...}
class Bar extends ParentClass {private $id, $propertyVal; ...} 
//...(more classes)...

只有一个查询，我想通过id选择一个行，并创建一个类型的对象定义表的类型列与SELECTed行中的其他列分配给新创建的对象。

Using only one query, I would like to SELECT a row by id and create an object of the type define the table's type column with other columns in the SELECTed row being assigned to the newly created object.

我在想：使用：

1. mysql_fetch_object（）


2. 读取类型属性


3. 创建类型属性定义的类型的对象

但是知道没有办法动态创建一个基于字符串的类型。如何做到这一点？

But know of no way to dynamically create a type based on a string. How does one do this?

推荐答案

但是知道没有办法基于字符串动态创建类型。如何做到这一点？

But know of no way to dynamically create a type based on a string. How does one do this?

您可以轻松自然地进行：

You can do it quite easily and naturally:

$type = 'myclass';

$instance = new $type;

如果您的查询返回关联数组，可以使用类似的语法指定属性：

If your query is returning an associative array, you can assign properties using similar syntax:

// build object
$type = $row['type'];
$instance = new $type;

// remove 'type' so we don't set $instance->type = 'foo' or 'bar'
unset($row['type']);  

// assign properties
foreach ($row as $property => $value) {
   $instance->$property = $value;
}

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