Introduction to the role of PHP @ at mark, at example_PHP tutorial

Example introduction to the role of PHP @ at mark, at example

Looking at the PHP code, there are always @ symbols in front of some lines, but I still don’t know what they mean. For example dede5.7 @ni=imagecreatetruecolor(ftoW,$ftoH);

I used it today, so just remember it. In fact, it is an error control character, that is, even if an error occurs, the error message will be ignored and the following code will continue to be executed.

@$page=$_GET['page']?intval($_GET['page']):1;

This sentence is to get the value of the page keyword from the URL, such as "index.php?page=5", then $page will get 5.

But if there is an error, for example, there is no page keyword after "index.php", and if $_GET['page'] does not exist, an error will be reported. At this time, you can ignore this small error with @.

Another example:

$conn = mysqli_conncet("q","w","e","r");

This will input error information about connecting to the database.

If you add @ in front of $conn, you can prevent it from outputting error messages.

@$conn = mysqli_conncet("q","w","e","r");

Just jot it down here.

PHP tagging issue

short_open_tag = On
That’s right. You need to remove the semicolon at the beginning of that line. The semicolon means, "This line is a comment and has no effect."
Why can’t apcha be output? The startup path has been set up
If you use you can output
Of course ah. If you haven't turned on the short tag, then only the content between will be displayed.
Remember to start with

The function and usage of this symbol ^ in php

^ is a starting matching tag in PHP regular expression

$preg = '/^a/';//matches characters starting with a

http://www.bkjia.com/PHPjc/891102.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/891102.htmlTechArticlePHP @ at mark example introduction, look at the PHP code for the at example, there are always @ symbols in front of some lines, Never knew what it meant. For example dede5.7 @ni=imagecreatetruecolor(ftoW,$ftoH...