Instructions on the use of the at @ symbol in php

I believe many new php users, like me, have been depressed when learning PHP. @ (At) What is the mark?

Once you download other people's source code, you can see countless @ marks and start to think it is a comment. Later, you will find that the @ statements will be executed. Wondering, what is this mark .....

With the continuous development of learning, I finally understood it. This mark is similar to the ignore error "on error resume next" in asp ". They play the same role. When the php interpreter encounters a statement starting with @, it will continue to execute subsequent statements regardless of whether the statement of the row is successfully executed, and no error will be reported. Note that the @ (at) mark only applies to the current row.

 
 
I hope that the @ (at) issue will be fixed here.
 

Eg. The following sentence must report an error

Error Code

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<? Php $ SQL = mysql_connect (*); ?>

 

However, if we add the @ (at) Mark, no error will be reported and the execution will continue.

No error code

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<? Php @ $ SQL = mysql_connect (*); Echo "I have been executing "; ?>

Continue to execute the following code.

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@ $ Page = $ _ GET ['page']? Intval ($ _ GET ['page']): 1;

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

However, if there is an error, such as "index. php "does not have the page keyword. If $ _ GET ['page'] does not exist, an error is returned. If @ is returned, this small error can be ignored.

For example:

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

In this case, an error message is entered about database connection.

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

If @ is added before $ conn, the error message will not be output.