Usage of the at (@) symbol in php

For beginners of php, it is often seen that there is an at (@) symbol in front of a function name, but they do not know its role and usage. after removing it, it seems that it has no effect on the program, I am very confused. Simply put, @ can ignore errors. the incorrect conversion function is the error control operator. the following describes its usage. For beginners of php, it is often seen that there is an at (@) symbol in front of a function name, but they do not know its role and usage. after removing it, it seems that it has no effect on the program, I am very confused. Simply put, @ can ignore errors. the incorrect conversion function is the error control operator. the following describes its usage.

For example:
Function db_connect () // connect to the database
{
@ $ Db = mysql_connect ('localhost', 'root', 'test ');
If (! $ Db)
Throw new Exception ('failed to connect to the database! Please try again! ');
Mysql_select_db ('book ');
Return $ db;
}

If the connection to the database fails, the previous "@" will be able to suppress the error, that is, it will not display the error, and then throw an exception to display its own exception handling, this is just to make the page viewer invisible. unfriendly pages cannot suppress errors, but can only Suppress display errors! @ Is used in the place where you think an error may occur in the future. @ a space will be placed next to it! It is better to use less, as if to increase the system overhead. For beginners of php, it is often seen that there is an at (@) symbol in front of a function name, but they do not know its role and usage. after removing it, it seems that it has no effect on the program, I am very confused. Simply put, @ can ignore errors. the incorrect conversion function is the error control operator. the following describes its usage.

For example:
Function db_connect () // connect to the database
{
@ $ Db = mysql_connect ('localhost', 'root', 'test ');
If (! $ Db)
Throw new Exception ('failed to connect to the database! Please try again! ');
Mysql_select_db ('book ');
Return $ db;
}

If the connection to the database fails, the previous "@" will be able to suppress the error, that is, it will not display the error, and then throw an exception to display its own exception handling, this is just to make the page viewer invisible. unfriendly pages cannot suppress errors, but can only Suppress display errors! @ Is used in the place where you think an error may occur in the future. @ a space will be placed next to it! It is better to use less, as if to increase the system overhead.