YahooPHP Interview Question 2

How do you define a class of myclass with no member correspondence or features?

1. what are the differences between foo () and @ foo?
2. how do you renew your PHP application?
3. what is "=? For example, "=" is true, but "=" is true.
4. how do you define a class of myclass that does not have a letter or feature?
5. how do you generate a myclass object?

The following are the answers provided by Matt Wilkin:

1. what are the differences between foo () and @ foo?
Foo () will parse this function, and any solution operator, method operator, and line operator will be shown on the response surface.
@ Foo () when writing this function, all the preceding response messages will be hidden.
Many applications use @ mysql_connect () and @ mysql_query to hide the warning messages of mysql. I think this is a serious loss, because the hacker should not be hidden, you must properly handle them and solve them if possible.
2. how do you renew your PHP application?
I don't often do this. I have used many different diagnostic tools and it is not easy to set these tools in Linux systems. However, I will introduce a recently noticed failover tool below.
PHP-Advanced PHP Debugger or merge PHP-APD. The first step is to install the following command on the slave line:

Pear install apd

After security, add the following sentence at the beginning of your notebook to start the operation:

Apd_set_pprof_trace ();

After the renewal, open the following cases to check the daily renewal of the production line:
Apd. dumpdir
You can also use pprofp to format the daily layout.
For more information, visit http://us.php.net/manual/en/ref.apd.php.
3. what is "=? For example, "=" is true but "=" is false.
"=" Is a function that can either return a false value or return a letter that is not a false value but can contain a false value, strpos () and strrpos () are two examples.
The second part of the question is a bit difficult. it is false to think of a "=", but "=" is a real example. On the contrary, there are few examples. However, I finally found the following example:

12345678

If (strpos ("abc", "a") = true) {// This part will never be merged because the position of "a" is 0, if (strpos ("abc", "a") = true) {// This part will be deleted, because the return value of the credential strpos () cannot be converted into a distributed value .}

4. how do you define a class of myclass that does not have a letter or feature?

123	class myclass { }

5. how do you generate a myclass object?

$ Obj = new myclass ();

There is no more simple than this one.