PHP Questions

Q:

Explain Superglobal variables in PHP .

Answer

To access the global data which is originating externally, the super globals are used. The superglobals are available as arrays. These superglobals represents the data from URLs, HTML forms, cookies, sessions and also the web server. For this purpose, $HTTP_GET_VARS, $HTTP_POST_VARS are used. The super globals are pretty good enough to be used in functions. The following are the list of super globals.


$_GET, $_POST, $_COOKIE;$_REQUEST, $_SERVER, $_SESSION, $_ENV, $_FILE


Another PHP Superglobal, called $GLOBALS; is available for persisting every variable with global scope.

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Q:

How can we extract string "abc.com" from a string "https://info@abc.com" using regular _expression of php?

Answer

We can use the preg_match() function with “/.*@(.*)$/” as the regular expression pattern.
For example:
preg_match("/.*@(.*)$/","https://info@abc.com",$data);
echo $data[1];
?>

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Q:

How to create a basic text file in php?

Answer

$filename = "/home/user/guest/newfile.txt";
$file = fopen( $filename, "w" );
if( $file == false )
{
echo ( "Error in opening new file" );
exit();


}
fwrite( $file, "This is a simple test\n" );
fclose( $file );

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Q:

Explain the working with directories using opendir(), readdirs(), closedir() along with examples.

Answer

Opendir():- It opens the directory. This function returns a directory stream on success and FALSE and an error on failure.


Syntax:


Opendir(directory, context)


Context is a set of options that can modify the behavior of a stream


Example: opens sample directory.


$dir = opendir("directory");


 


Readdir(): It returns an entry from a directory handle opened by opendir().


Syntax:


Readdir(dir_stream)


Example:


$file = readdir($dir);


 


closedir(): It closes a directory handle opened by opendir().


Syntax:


closedir(dir_stream)


Example:


$file = close($dir);

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Q:

Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?

Answer In this example it wouldn’t matter, since the variable is all by itself, but if you were to print something like "{$a},000,000 mln dollars", then you definitely need to use the braces.
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Q:

What is PHP’s configuration file called ?

Answer

PHP’s configuration file is called php.ini.

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Q:

What’s the difference between accessing a class method via -> and via ::?

Answer :: is allowed to access methods that can perform static operations, i.e. those, which do not require object initialization.
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Q:

What is the difference between the functions unlink and unset in PHP?

Answer

The function unlink() is to remove a file, where as unset() is used for destroying a variable that was declared earlier.

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