Simple usage of Try, throw and catch in PHP_PHP Tutorial

Simple usage of Try, throw and catch in PHP

This article briefly records the usage of Try, throw and catch in PHP. I will do a detailed analysis later when I have time.

Try - Functions that use exceptions should be inside a "try" block. If no exception is triggered, the code continues execution as usual. But if the exception is triggered, a

will be thrown

Exception.

Throw - This specifies how to trigger the exception. Each "throw" must correspond to at least one "catch"

Catch - The "catch" code block will catch the exception and create an object containing the exception information

Let’s trigger an exception:

<?php 
//创建可抛出一个异常的函数 
function checkNum($number){
	if($number>1){
		throw new Exception("Value must be 1 or below");
	}
	return true;
}
//在 "try" 代码块中触发异常 
try{
	checkNum(2);
//捕获异常
}catch(Exception $e){
	echo 'Message: ' .$e->getMessage();
}

The above code will get an error similar to this:

Message: Value must be 1 or below

Explanation of examples:

The above code throws an exception and catches it:

Create checkNum() function. It detects whether the number is greater than 1. If so, throw an exception.

Call the checkNum() function in the "try" code block.

Exception in checkNum() function was thrown

The "catch" code block receives the exception and creates an object ($e) containing the exception information.

By calling $e->getMessage() from this exception object, the error message from the exception is output, however, in order to comply with "Each throw must correspond to one

Based on the catch principle, a top-level exception handler can be set up to handle missed errors.

Articles you may be interested in

• A simple example of php getting web content through socket
• php prompt PHP Warning: date(): It is not safe to rely on the... Error solutions
• Usage of several keywords such as $this, static, final, const, self and so on in php
• phpMyAdmin Cannot start session without errors Error solution
• Memcache installation and configuration tutorial under windows
• Send email SMTP Error Could not connect to SMTP host. Send fail solution
• file_get_contents in curl in PHP Performance efficiency comparison
• Principles and tutorials on PHP connection and manipulation of Memcached

http://www.bkjia.com/PHPjc/987400.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/987400.htmlTechArticleSimple usage of Try, throw and catch in PHP. This article briefly records the usage of Try, throw and catch in PHP. , I will do a detailed analysis later when I have time. Try - Use exception functions...