Home Backend Development PHP Tutorial php错误处理技术,顶级错误处理器

php错误处理技术,顶级错误处理器

Jun 13, 2016 pm 12:29 PM
exception function

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:

复制代码
<meta http-equiv="content-type" content="text/html;charset=utf-8">
Copy after login
<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>?>
Copy after login
复制代码

转载自:http://blog.sina.com.cn/s/blog_641d5693010121cr.html

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What does function mean? What does function mean? Aug 04, 2023 am 10:33 AM

Function means function. It is a reusable code block with specific functions. It is one of the basic components of a program. It can accept input parameters, perform specific operations, and return results. Its purpose is to encapsulate a reusable block of code. code to improve code reusability and maintainability.

Causes and solutions to ConcurrentModificationException exceptions in Java Causes and solutions to ConcurrentModificationException exceptions in Java Jun 25, 2023 am 10:33 AM

In Java, when multiple threads operate a collection object at the same time, a ConcurrentModificationException exception may occur. This exception usually occurs when traversing the collection when modifying or deleting elements. This will cause the state of the collection to be inconsistent, thus throwing abnormal. This article will delve into the causes and solutions to this exception. 1. Causes of Exception Normally, ConcurrentModificationException exception

What is the purpose of the 'enumerate()' function in Python? What is the purpose of the 'enumerate()' function in Python? Sep 01, 2023 am 11:29 AM

In this article, we will learn about enumerate() function and the purpose of “enumerate()” function in Python. What is the enumerate() function? Python's enumerate() function accepts a data collection as a parameter and returns an enumeration object. Enumeration objects are returned as key-value pairs. The key is the index corresponding to each item, and the value is the items. Syntax enumerate(iterable,start) Parameters iterable - The passed in data collection can be returned as an enumeration object, called iterablestart - As the name suggests, the starting index of the enumeration object is defined by start. if we ignore

Detailed explanation of the role and function of the MySQL.proc table Detailed explanation of the role and function of the MySQL.proc table Mar 16, 2024 am 09:03 AM

Detailed explanation of the role and function of the MySQL.proc table. MySQL is a popular relational database management system. When developers use MySQL, they often involve the creation and management of stored procedures (StoredProcedure). The MySQL.proc table is a very important system table. It stores information related to all stored procedures in the database, including the name, definition, parameters, etc. of the stored procedures. In this article, we will explain in detail the role and functionality of the MySQL.proc table

How to deal with UnsupportedEncodingException in Java? How to deal with UnsupportedEncodingException in Java? Jun 25, 2023 am 08:02 AM

How to deal with UnsupportedEncodingException in Java? In Java programming, you may encounter UnsupportedEncodingException. This exception is usually caused by incorrect encoding conversion or an unsupported encoding. In this article, we will introduce the causes of UnsupportedEncodingException exception and how to deal with it. What is UnsupportedE

Solution to PHP Fatal error: Uncaught exception 'PDOException' Solution to PHP Fatal error: Uncaught exception 'PDOException' Jun 23, 2023 pm 12:09 PM

In PHP development, you may encounter errors such as "PHPFatalerror:Uncaughtexception'PDOException'". This is an exception caused by an error when PHP operates the database. If this error is not handled in time, it will cause program interruption or unexpected errors. So how to solve this problem? Here are some common solutions. 1. Check the database parameters. First, we need to check the parameters passed when connecting to the database.

The usage and function of Vue.use function The usage and function of Vue.use function Jul 24, 2023 pm 06:09 PM

Usage and Function of Vue.use Function Vue is a popular front-end framework that provides many useful features and functions. One of them is the Vue.use function, which allows us to use plugins in Vue applications. This article will introduce the usage and function of the Vue.use function and provide some code examples. The basic usage of the Vue.use function is very simple, just call it before Vue is instantiated, passing in the plugin you want to use as a parameter. Here is a simple example: //Introduce and use the plug-in

What is the usage of js function What is the usage of js function Oct 07, 2023 am 11:25 AM

The usage of js function function is: 1. Declare function; 2. Call function; 3. Function parameters; 4. Function return value; 5. Anonymous function; 6. Function as parameter; 7. Function scope; 8. Recursive function.

See all articles