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HomeBackend DevelopmentPHP Tutorialzephir-(12)php函数和异常处理

#zephir-php函数和异常处理#![](http://i.imgur.com/OuZmZ0R.png)##前言##***先在这里感谢各位zephir开源技术提供者***经过了一个多月的学习,zephir的文档译文和基础讲解也将近尾声了,后面的内容最为重要也希望和大家一同更好的学习交流,本节的内容只要是讲解zephir是怎么时候PHP自带的函数库已经特德异常机制处理的,那么让我们开始本节的旅程把.**注:笔者水平有限,说的不正确的地方希望大家多多指正,一同交流技术**附上:喵了个咪的博客:[w-blog.cn](w-blog.cn)zephir官网地址:[http://zephir-lang.com/](http://zephir-lang.com/ "zephir官网")github地址:[https://github.com/phalcon/zephir](https://github.com/phalcon/zephir)##php函数##PHP有一个丰富的函数库,您可以使用在你的扩展。 调用PHP函数只需正常使用它在你Zephir代码:	namespace MyLibrary;		class Encoder	{		    public function encode(var text)	    {	        if strlen(text) != 0 {	            return base64_encode(text);	        }	        return false;	    }	}你可以调用用户建立的php函数:	namespace MyLibrary;		class Encoder	{		    public function encode(var text)	    {	        if strlen(text) != 0 {	            if function_exists("my_custom_encoder") {	                return my_custom_encoder(text);	            } else {	                return base64_encode(text);	            }	        }	        return false;	    }	}注意所有PHP函数只接收和返回动态变量。 如果你通过静态类型变量作为参数,一个临时的动态变量将自动被用作桥为了调用函数:	namespace MyLibrary;		class Encoder	{		    public function encode(string text)	    {	        if strlen(text) != 0 {	            return base64_encode(text);	        }	        return false;	    }	}类似地,函数返回动态值不能直接分配给静态变量:	namespace MyLibrary;		class Encoder	{		    public function encode(string text)	    {	        string encoded = "";		        if strlen(text) != 0 {	            let encoded = (string) base64_encode(text);	            return '(' . encoded . ')';	        }	        return false;	    }	}Zephir动态提供了一种方法来调用函数,如:	namespace MyLibrary;		class Encoder	{		    public function encode(var callback, string text)	    {	        return {callback}(text);	    }	}##异常处理##Zephir实现异常在很低的水平,为PHP提供类似的行为和功能。抛出异常时,可以使用“捕捉”块捕获异常并允许 开发人员提供适当的处理。	try {		    //异常都可以在这里抛出	    throw new \Exception("This is an exception");		} catch \Exception, e {		    //处理异常	    echo e->getMessage();	}Zephir提供了一直没有反应的“try”,简单地忽略任何异常在那块:	try {	    throw new \Exception("This is an exception");	}一个“catch ”块可以用来捕获不同类型的异常:	try {		    //异常都可以在这里抛出	    throw new \Exception("This is an exception");		} catch RuntimeException|Exception, e {		    //处理异常	    echo e->getMessage();	}Zephir允许你把文字或静态类型化变量当作异常的消息:	throw "Test";   // throw new \Exception("Test");	throw 't';      // throw new \Exception((string) 't');	throw 123;      // throw new \Exception((string) 123);	throw 123.123;  // throw new \Exception((string) 123.123);Zephir作为PHP的异常提供相同的设施,让你知道发生了异常。 例外::getFile()和异常:getLine()返回位置Zephir代码已经被抛出的异常:		Exception: The static method 'someMethod' doesn't exist on model 'Robots'	File=phalcon/mvc/model.zep Line=4042	#0 /home/scott/test.php(64): Phalcon\Mvc\Model::__callStatic('someMethod', Array)	#1 /home/scott/test.php(64): Robots::someMethod()	#2 {main}##总结##本节主要讲解了,zephir可以直接使用PHP的函数库并且可以直接调用PHP用户定义的函数,其实这个是对PHP开发这最方便的一件事情,还有对异常处理进行了一些粗略的讲解,那么今天的zephir译文和讲解就到这里了,多谢大家的支持!注:笔者能力有限有说的不对的地方希望大家能够指出,也希望多多交流!**zephir技术交流:246348908 欢迎大家的加入!****感谢zephir开发人员:**![](http://i.imgur.com/puoG4mx.png)

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