Interview Questions & Answers

Array sorting functions in PHP: asort() arsort() ksort() krsort() uksort() sort() natsort() rsor...

If you have a file, and you want to read the entire file into a single string, you can use the file_get_contents() function. It opens the specified file, reads all characters in the file, and returns them in a single stri...

The session support can be turned on automatically at the site level, or manually in each PHP page script: * Turning on session support automatically at the site level: Set session.auto_start = 1 in php.ini. * Turning on session support manually in each page script: Call session_start() functi...

We can create MySQL database with the use of mysql_create_db($databaseName) to create a databa...

Just run the PHP CLI (Command Line Interface) program and provide the PHP script file name as the command line argument. For example, "php myScript.php", assuming "php" is the command to invoke the CLI program. Be aware that if your PHP script was written for the Web CGI interface, it may not execute properly in command line environme...

To store uploaded files to MySQL database, you can use the normal SELECT statement as shown below: <?php $con = mysql_connect("localhost", "", ""); mysql_select_db("fyi"); $error = $_FILES['fyicenter_logo']['error']; $tmp_name = $_FILES['fyicenter_logo']['tmp_name']; $size = $_FILES['fyicenter_logo']['size']; $name = $_FILES['fyicenter_logo']['name']; $type = $_FILES['fyicenter_logo']['type']; print(" \n"); if ($error == UPLOAD_ERR_OK && $size > 0) { $fp = fopen($tmp_name, 'r'); $content = fread($fp, $size); fclose($fp); $content...

Both GET and POST are used to collect data from a form. However, when security is desired $_POST should be used. When the $_ POST variable is used, all variables used are NOT displayed in the URL. Also, they have no restrictions to the length of the variables. GET should be used when the interaction with the form is more like a question. For e.g. firing a query etc. POST should be used more often when the interaction is more like an order or the interaction changes the state of the resource. POST example: Name: Age: On clicking submit the...

isset() function is used to determine if a variable is set or not. It returns true if the variable exists. If multiple parameters are supplied then isset() will return TRUE only if all of the parameters are set. Example: $a =”sample”; var_dump(isset($a)); //tr...

There are three basic types of run time errors in PHP: 1. Notices: These are small, non-critical errors that PHP encounters while executing a script - for example, accessing a variable that has not yet been defined. By default, such errors are not displayed to the user at all - although the default behavior can be changed. 2. Warnings: Warnings are more severe errors like attempting to include() a file which does not exist. By default, these errors are displayed to the user, but they do not result in script termination. 3. Fatal errors: These...

The include_once() statement includes and evaluates the specified file during the execution of the script. This is a behavior similar to the include() statement, with the only difference being that if the code from a file has already been included, it will not be included again. The major difference between include() and require() is that in failure include() produces a warning message whereas require() produces a fatal erro...

Set the cookie time in pa...

If you look at the large variety of SQL commands, they can be divided into three large subgroups. Data Definition Language deals with database schema and descriptions of how the data should reside in the database, therefore language statements like CREATE TABLE or ALTER TABLE belong to DDL. DML deals with data manipulation, and therefore includes most common SQL statements such SELECT, INSERT, etc. Data Control Language includes commands such as GRANT, and mostly concerns with rights, permissions and other controls of the database syst...

Allow modules to interact with the Drupal core. Drupal's module system is based on the concept of "hooks". A hook is a PHP function that is named foo_bar(), where "foo" is the name of the module (whose filename is thus foo.module) and "bar" is the name of the hook. Each hook has a defined set of parameters and a specified result type. To extend Drupal, a module need simply implement a hook. When Drupal wishes to allow intervention from modules, it determines which modules implement a hook and calls that hook in all enabled modules that ...

Yes, you can use drush – drush is a command line shell and Unix scripting interface for Dru...

Drupal is an open-source platform and content management system for building dynamic web sites offering a broad range of features and services including user administration, publishing workflow, discussion capabilities, news aggregation, metadata functionalities using controlled vocabularies and XML publishing for content sharing purposes. Equipped with a powerful blend of features and configurability, Drupal can support a diverse range of web projects ranging from personal weblogs to large community-driven sit...

Drupal, Joomla, Wordpress, TY...

A content management system (CMS) is a collection of procedures used to manage work flow in a collaborative environment. These procedures can be manual or computer-based. The procedures are designed to: Allow for a large number of people to contribute to and share stored data Control access to data, based on user roles. User roles define what information each user can view or edit Aid in easy storage and retrieval of data Reduce repetitive duplicate input Improve the ease of report writing Improve communication between users In a CMS, data can...

Set the cookie time in past. Example: setcookie('Test',$i,time()-3600); // already expired time...

MySQL is a relational database management system (RDBMS) that runs as a server providing multi-user access to a number of databas...

There are several differences between PHP4 and PHP5. 1.Unified constructor and Destructor. 2.Exception has been introduced. 3.New error level named E_STRICT has been introduced. 4.Now we can define full method definitions for an abstract class. 4.Within a class we can define class constants. 5.we can use the final keyword to indicate that a method cannot be overridden by a child Added features in PHP 5 are the inclusions of visibility, abstract and final classes and methods, additional magic methods, interfaces, cloning and typehinti...