PHP中的Linq

最近在看.net的新功能Linq,第一感觉,功能非常实用.数组,字符串都可以用我们熟悉的
SQL 方式来查询,太方便啦!

就想看看PHP在这方面有没有这样的类库.不查不知道,一查吓一跳,还真的有类似的类库,命名为PHPLinq.

澳门新葡亰手机版,PHPLinq的首页:

Examples

Examples can be found in the test package in the latest release.

A basic example

Let”s say we have an array of strings and want to select only the
strings whose length is 5. The PHPLinq way of achieving this would be
the following:

// Create data source$names = array(John, Peter, Joe, Patrick, Donald, Eric); $result = from(''$name'')-in($names) -where(''$name = strlen($name)  5'') -select(''$name''); 

Feels familiar to SQL? Yes indeed! No more writing a loop over this
array, checking the string”s length, and adding it to a temporary
variable. You may have noticed something strange… What”s that $name =
strlen($name) 5 doing? This piece of code is compiled to an anonymous
function or Lambda expression under the covers. This function accepts a
parameter $name, and returns a boolean value based on the expression
strlen($name) 5.

An advanced example

There are lots of other examples available in the PHPLinq download, but
here”s an advanced one… Let”s say we have an array of Employee
objects. This array should be sorted by Employee name, then Employee
age. We want only Employees whose name has a length of 4 characters.
Next thing: we do not want an Employee instance in our result. Instead,
the returning array should contain objects containing an e-mail address
and a domain name. First of all, let”s define our data source:

class Employee { public $Name; public $Email; public $Age; public function __construct($name, $email, $age) { $this-Name = $name; $this-Email = $email; $this-Age = $age;