codeplex：PHP LINQ classes，PHP也可以使用Linq语法操作对象

amohan

于 2015-01-24 16:42:32 发布

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本文展示了如何利用PHP Linq简化对字符串数组的筛选操作，通过匿名函数或Lambda表达式实现条件过滤，避免了传统循环和条件检查的繁琐过程。

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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. （待续...）

转载地址：http://www.weiqinxue.cn/blogs/index.php/User/articleview/ArticleID/U2A15