PHP Answer Then PHP Question

codefreek · 07-17-2009, 05:05 AM

Hey, So cecilia made Answer Then ask, so i made this,
PHP Answer Then PHP Question,

Quote:

Example of use:

-Post 1
Q: What is the difference between mysql_connect() and mysql_pconnect()?

--Post 2
Answer :
in short mysql_pconnect() makes a persistent connection to the database which means a SQL link that do not close when the execution of your script ends.

And then your turn to ask a php question.

I made this thread because sometimes, fast answer can save you from the monsters ;)
Enjoy..

PS: Try and keep the question and answer short if possible.

Enfernikus · 07-18-2009, 02:43 AM

mysqli_connect makes use of the MySQLimproved library which is faster than the old mysql_* function - how ever the OO approached is preferred.

adamdecaf · 07-18-2009, 05:40 AM

This will be a short/simple answer.

What's the difference between include and require (with standard/default error_reporting).

codefreek · 07-18-2009, 05:24 PM

A: "For" i mainly to state one action to do, and while is to do while something else is done at the same time if that makes any sense..

Q: How do I find out if an array has values posted to each of its elements? I need to know that EVERY element has been filled out.

PS: I know the answer to this question but to keep the minds flowing i shall ask
questions,

codefreek · 07-20-2009, 02:22 AM

something like this maybe :)
A:

PHP Code:


			
$q = mysql_query("SELECT LENGTH(firstname) AS thelength FROM myfriends ORDER BY thelength DESC LIMIT 1");

$longestname = mysql_result($q,0,0);

echo "The longest first name is $longestname letters long!";

Q: How To generate a random number between 0 and 100 ?

srand((double)microtime()*1000000);
echo rand(0,100);

adamdecaf · 07-20-2009, 02:42 AM

A:

PHP Code:


			
echo rand(0,100);

Q: How can you move a file which has been uploaded? (Assume that it is in the $_FILES array).

Village Idiot · 07-20-2009, 03:31 AM

Quote:

Originally Posted by adamdecaf

A:

PHP Code:


			
echo rand(0,100);

Q: How can you move a file which has been uploaded? (Assume that it is in the $_FILES array).

move_uploaded_file();

Why is MIME type a bad way to validate your uploads?

adamdecaf · 07-20-2009, 03:35 AM

A: You can hide files in any format you want.

Q: What is a good way to validate file uploads?

Village Idiot · 07-20-2009, 03:39 AM

Quote:

Originally Posted by adamdecaf

A: You can hide files in any format you want.

Q: What is a good way to validate file uploads?

Short answer: File extension
Long answer: File extension will suffice, but actually validating the content is the best way (although this is rarely practical).

Which of the following will NOT locally work with PHP on a *nix machine
MySQL
SQL Server 2005
PostgreSQL

codefreek · 07-20-2009, 04:12 AM

A: SQL Server 2005 (if i remember correctly)

Q: Can you store unlimited data in a cookie ?

adamdecaf · 07-20-2009, 04:18 AM

A: No, unlimited data does not exist. It is physically impossible to store an infinite amount of data. I think you can store 4 kilobytes.

Q: What is the best way to sort 1,000,000 32-bit integers.

codefreek · 07-20-2009, 07:12 AM

A:

PHP Code:


			
function my_function($var1,$var2,$var3){

// Place to enter code here.

$var=$var1+$var2+$var3;

return $var;

}

$my_val=my_function(5,6,8);

echo "The return value= $my_val";

// The above line will print the sum of the three variables.

Q: Can anything be stored in a cookie ?

Village Idiot · 07-20-2009, 06:15 PM

Quote:

Originally Posted by codefreek

A:

PHP Code:


			
function my_function($var1,$var2,$var3){
// Place to enter code here.
$var=$var1+$var2+$var3;
return $var;
}
$my_val=my_function(5,6,8);
echo "The return value= $my_val";
// The above line will print the sum of the three variables.

Q: Can anything be stored in a cookie ?

No. HTTP limits the cookie header to 4kb.

At what version did PHP add respectable OOP functionality.

codefreek · 07-20-2009, 07:19 PM

A: PHP4..

Q: How can I create thumbnails using PHP?

adamdecaf · 07-18-2009, 05:05 PM

Quote:

Originally Posted by knight13

A: I believe if include(); fails it will produce a warning and if require fails it will produce a fatal error and it will not process the page..Hopefully that is right and what you were asking.

Q: What is the difference between $_GET and $_POST ?

Ya, I wanted the question to be simple..

A: $_GET will retrieve parameters from the URI, it is publicly viewable and editable. $_POST grabs the parameters from the HTTP header (?right?) and it is harder to edit or "hack" but not impossible.

Q: What is the difference from a "for" and a "while" loop?