php错误处理技术,顶级错误处理器

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Release: 2016-06-13 12:29:25
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php异常处理技术,顶级异常处理器

php对异常的处理与java一样,用到的是try{}catch(){}

定义顶级异常处理器用到的函数是

set_exception_handler("My_exception");

这里的My_expection是开发者自定义的异常处理函数,既顶级异常处理器,只有当程序中没有函数来处理异常才有顶级异常处理器来处理异常,如果没有定义顶级异常处理器,则由系统默认的异常处理器来处理异常

举例说明:

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<span style="color: #000000;">php    </span><span style="color: #008080;">set_exception_handler</span>("My_expection"<span style="color: #000000;">);    </span><span style="color: #0000ff;">function</span><span style="color: #000000;"> My_expection(){        </span><span style="color: #0000ff;">echo</span> "这里是顶级异常处理器"<span style="color: #000000;">;    }    </span><span style="color: #0000ff;">try</span><span style="color: #000000;">{        nohello(</span>"hello"<span style="color: #000000;">);    }</span><span style="color: #0000ff;">catch</span>(<span style="color: #0000ff;">Exception</span> <span style="color: #800080;">$e</span><span style="color: #000000;">){        </span><span style="color: #0000ff;">throw</span> <span style="color: #800080;">$e</span><span style="color: #000000;">;    }  </span><span style="color: #0000ff;">function</span> nohello(<span style="color: #800080;">$nohello</span><span style="color: #000000;">){          </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$nohello</span> == "hello"<span style="color: #000000;">){              </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> <span style="color: #0000ff;">Exception</span>("不能输入hello"<span style="color: #000000;">);          }</span><span style="color: #0000ff;">else</span><span style="color: #000000;">{            </span><span style="color: #0000ff;">echo</span> "输入成功"<span style="color: #000000;">;        }    }</span>?>
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转载自:http://blog.sina.com.cn/s/blog_641d5693010121cr.html

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