Senior PHP Programmer

$GLOBALS − Contains a reference to every variable which is currently available within the global scope of the script. The keys of this array are the names of the global variables.

By default the PHP script takes 30secs to execute. This time is set in the php.ini file. This time can be increased by modifying the max_execution_time in seconds. The time must be changed keeping the environment of the server. This is because modifying the execution time will affect all the sites hosted by the server.

The PHP $_REQUEST variable contains the contents of both $_GET, $_POST, and $_COOKIE. We will discuss $_COOKIE variable when we will explain about cookies. The PHP $_REQUEST variable can be used to get the result from form data sent with both the GET and POST methods.

in_array used to checks if a value exists in an array

One of the environment variables set by PHP is HTTP_USER_AGENT which identifies the user's browser and operating system.

Session variables are stored in associative array called $_SESSION[]. These variables can be accessed during lifetime of a session.

Make use of isset() function to check if session variable is already set or not.

PHP uses mysql_query function to create a MySQL database. This function takes two parameters and returns TRUE on success or FALSE on failure.

bool mysql_query( sql, connection );

Eg : var $arr = array('apple', 'grape', 'lemon');

if ($_FILES["file"]["error"] == 0)

{

move_uploaded_file($_FILES["file"]["tmp_name"],

"upload/" . $_FILES["file"]["name"]);

echo "Stored in: " . "upload/" . $_FILES["file"]["name"];

}

PHP 5's new SimpleXML module makes parsing an XML document, well, simple. It turns an XML document into an object that provides structured access to the XML. To create a SimpleXML object from an XML document stored in a string, pass the string to simplexml_load_string( ). It returns a SimpleXML object.

mysql_connect(servername,username,password);

eg : echo $_COOKIE["user"];

The main difference between sessions and cookies is that sessions are stored on the server, and cookies are stored on the user's computers in the text file format. Cookies can not hold multiple variables,But Session can hold multiple variables.We can set expiry for a cookie,The session only remains active as long as the browser is open.Users do not have access to the data you stored in Session,Since it is stored in the server.Session is mainly used for login/logout purpose while cookies using for user activity tracking

PHP provides mysql_connect function to open a database connection.

connection mysql_connect(server,user,passwd,new_link,client_flag);

The variable $this is a special variable and it refers to the same object ie. itself.

It's how they handle failures. If the file is not found by require(), it will cause a fatal error and halt the execution of the script. If the file is not found by include(), a warning will be issued, but execution will continue.

The function getdate() optionally accepts a time stamp and returns an associative array containing information about the date. If you omit the time stamp, it works with the current time stamp as returned by time().

Using getTrace() method of Exception class which returns array of the backtrace.

Interfaces are defined to provide a common function names to the implementors. Different implementors can implement those interfaces according to their requirements. You can say, interfaces are skeletons which are implemented by developers.