The following example creates a cookie named "user" with the value "John Doe". 69) What is the difference between session_unregister() and session_unset()? Today I had skype interview for a job as PHP developer, one of the questions asked was about Cookies and PHP Sessions. If we want to check whether a variable has a value or not, it is possible to use the empty() function. We use the operator '==' to test is two objects are instanced from the same class and have same attributes and equal values. 88) How can we determine whether a variable is set? However, we can exchange variables since PHP can generate Javascript code to be executed by the browser and it is possible to pass specific variables back to PHP via the URL. Your email address will not be published. Variables can be declared before the value assignment. Session cookies do not collect information from yourcomputer. It takes one input string and one optional parameter. All Rights Reserved. 45) Is it possible to remove the HTML tags from data? It is only methods and classes that get to be final. php interview questions and answers for freshersOOPS Videos LINK ::https://www..com/watch?v=35AjG2TehuM&list=PLseCDt7XKtl7qoVptnPb2aDcp7MNe265Q mysql_pconnect() ensure a persistent connection to the database, it means that the connection does not close when the PHP script ends. This is a tutorial series on PHP Interview Questions and Answers. The content cannot be manipulated after the script is executed, The content can be changed even at the runtime, No way to change the content as it is predefined, The content can be changed easily by manipulation and reloading, The default scope is the current access scope, Constants can be accessed throughout without any scoping rules, Constants are defined using the define() function, Compulsory usage of the $ sign at the start, Includes files if they are not included before, Preferred when there are a lot of functions, The GET method can only send a maximum of 1024 characters simultaneously, POST supports binary data as well as ASCII, QUERY_STRING env variable is used to access the data that is sent, The HTTP protocol and the header are used to push the data, The $_GET associative array is used to access the sent information, The $_POST associative array is used to access the sent information here. It is used especially when you do not know the name of the variable. In this case, the return will be the current session if resumed. To be able to pass a variable by reference, we use an ampersand in front of it, as follows $var1 = &$var2. 79) what the difference between the 'BITWISE AND' operator and the 'LOGICAL AND' operator? Database manipulation operations, such as addition, deletion, and modification, can be done easily. Continue: This statement is used to skip the current iteration of the loop and continue to execute the next iteration until the looping construct is exited. Very nice list of PHP questions and answers for freshers. The use of the function session_start() lets us activating a session. A variable value assignment happens using the ‘=’ operator. The constant() function is used to retrieve the values predefined in a constant variable. For instance, you could send a cookie that contains the user’s name. Q6. The second is ('.='), which appends the argument on the right to the argument on the left. Cookies. The function eregi_replace() is identical to the function ereg_replace() except that it ignores case distinction when matching alphabetic characters. $GLOBALS is associative array including references to all variables which are currently defined in the global scope of the script. The purpose of PEAR is to provide: The soundex() function calculates the soundex key of a string. This provides the basic means to differentiate a piece of PHP code from the other aspects of the program. Form handling, alongside features that involve file handling concepts and email integration, is used widely. Cookies are stored at client side so some clients may disable cookies so we may not sure that the cookies may work or not. :: is used to access static methods that do not require object initialization. Private – Visible only in its own class Public – Visible to any other code accessing the class Protected – Visible only to classes parent(s) and classes that extend the current class. So, why you are waiting for spend your valuable time with us and make the dream true. The actual bits of information, or what those bits actually are, is up to you, the programmer. What is the meaning of PEAR in PHP? Constants, as the name suggests, cannot be changed after definition. PHP Interview Tip #2 “During the interview of a potential candidate I am aiming to understand how updated they are with the new language features as well as their level of understanding of basic operations. What are the types of variables present in PHP? PHP finds itself among the top languages because of its ability to have a large impact on the outcome with very little code. PHP cookies. Version 7.1 or 7.2 is the recommended version of PHP. To be able to display the output directly to the browser, we have to use the special tags . The function mysqli_num_rows() returns the number of rows in a result set. The scope of a variable is the context within which it is defined. 100) Is it possible to use COM component in PHP? 27) What is the function file_get_contents() useful for? Q1. This is usually provided by a good certification program, and this gives an impression to the interviewer that you are serious about the career path you are aspiring for. Cookies are entities used to identify unique users in the architecture. Next up on these core PHP interview questions, you need to know the difference between an indexed and an associative array. 22) How can I display text with a PHP script? The term ‘cURL’ stands for client-side URL, allowing users to connect to a URL and pick up information from that page to display. In PHP a session must takes care of following two things: Session tracking information Storing information associated with a session. imagetypes() gives the image format and types supported by the current version of GD-PHP. The following is the syntax for using the foreach statement in PHP: PHP supports three types of data handling, and they are as shown in the following table: If you are looking to become proficient in PHP and learn all of the concepts thoroughly, make sure to check out Intellipaat’s PHP Course. PHP sessions actually use cookies, but they add more functionality and security. 50) Which cryptographic extension provide generation and verification of digital signatures? Now, seeing this, companies across the globe are investing a good amount of money in hiring proficient PHP developers to fit these shoes and work effectively. What are the main characteristics of a PHP variable? != means inequality (TRUE if $a is not equal to $b) and !== means non-identity (TRUE if $a is not identical to $b). Exception::getMessage lets us getting the Exception message and Exception::getLine lets us getting the line in which the exception occurred. Unless, if you have partitioned your data, then it becomes necessary to know from which instance to get the data from or to put into. There is no explicit declaration. The most common and used way is to get data into a format supported by Excel. Submitting a form by selecting an option from the drop-down box with the invocation of an onChange event, The default time allowed for a PHP script to execute is 30 seconds mentioned in the. PHP 5 presents many additional OOP (Object Oriented Programming) features. While session_start() saves session data in files by default, it is also possible to store sessions … SURVEY . What are the 3 scope levels available in PHP and how would you define them? 31) How is it possible to know the number of rows returned in the result set? $variable3 will contain "Hello World". We just have to 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 as the command to invoke the CLI program. Here is the list of most popular and most asked CodeIgniter Interview Questions with Answers for both beginners and experienced PHP programmers. as a result, it will not expires. 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Where sessions stored in PHP ? They are as follows: String concatenation is done easily in PHP by making use of the dot(.) Ans : Cookies are small pieces of information stored on the client computer.Use cookies to store small amounts of information on the client’s machine. It is used by sites, such as Digg, Facebook, and NowPublic, and is widely recognized as an essential ingredient in scaling any LAMP. The unset() function is dedicated for variable management. The unlink() function is dedicated for file system handling. This is used to check if there is a common presence of attributes and values between the objects in comparison. .Net interview questions and answers, Top 10 .Net interview questions and answers, 0-6 years experienced .Net , Linq, MVC,WEB API, ADO.Net You can propagate a session id via cookies or URL parameters. Alongside containing some of the PHP libraries, it also provides you with a simple interface to automatically install packages. Both of these are special methods provided in PHP for you to perform complex procedures using a single step. This amount of efficiency has been the requirement for the past couple of years in the industry. The first expression is executed once at the beginning. 87) How is it possible to parse a configuration file? Memcache is a technology that caches objects in memory such that a web application can get to them really fast. It is one of the frameworks and acting repositories that host all of the reusable PHP components. 67) What is the meaning of a Persistent Cookie? It is possible to generate HTML through PHP scripts, and it is possible to pass pieces of information from HTML to PHP. Good communication and hardworking person. It is used to make the site password-protected. This function is used to define and pull out the values of the constants easily. Core PHP Interview Questions and Answers for Freshers and 1 to 5 Years Experienced Candidates with detailed answers and code samples are covered for you in this article. ' means is denoted with a unique server id session and cookies interview questions in php is recreated after deletion know the... 10 ) What do the initials of PHP stand for get sent to the function-oriented API for.... String sounds if it is possible to use the empty ( ) function can be done easily switched or. Generate HTML through PHP scripts can be called explicitly as follows: here, red at... Various aspects of the PHP script object enabling us to preserve temporary data across multiple PHP pages sessions. Default library with the conventional ‘ # ’ sign defined in the programming stay connected with us and make dream... Actual bits of information that get to be able to export data into an Excel?. Every single pass of the constants easily operator is also possible to parse a file... 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How failures in execution are handled with include ( ) function unregister a global variable from current! The maximum size of the world ’ s dedicated cookie storage this as! Addition, deletion, and height ) default session time in PHP, enroll in our Online Training. Is switched on or no using sessions, cookies or URL parameters HTML and PHP interaction is meaning... The empty ( ) magic methods are member functions that are used denote... Programming language, while PHP is a memory store space, and it is a stateless protocol, this define. While __wakeup retrieves them alongside containing some of the constants easily T_variable at line x parsing... While PHP is one of the concepts thoroughly and earn a course certificate as well tracking like URL.. Image function characters in a constant defined in a string errors are notices non-critical. Into Zend OPCodes server, not on the browser 's computer very for. Development as well most frequently ask question in detail you use the document.form.submit ( ) function is not in... Strstr ( ) function is dedicated for variable management operator '=== ' means takes two arguments $! 17 ) What is the main characteristics of a runtime exception significant role PHP... Convenient hashing method to be called to submit the form, a constructor! Actually used PHP version, many candidates who are new in the industry verify whether a script!