'final' is introduced in PHP5. $GLOBALS is associative array including references to all variables which are currently defined in the global scope of the script. 22) How can I display text with a PHP script? Next up on these PHP interview questions, you need to understand a fundamental concept. imagetypes() gives the image format and types supported by the current version of GD-PHP. Exception::__toString gives the String representation of the exception. PHP development is one of the most coveted jobs in the world of web development as well. gather data from files, save data to a file, thru email you can send data, return data to the user. One big advantage of session is that we can store any kind of object in it. quite helpful. 1. The constant() function is used to retrieve the values predefined in a constant variable. The second is ('.='), which appends the argument on the right to the argument on the left. PHP has a plethora of uses for developers. The working of foreach is simple; with every single pass of the value, elements get assigned a value and pointers are incremented. « OOPS Interview Questions and Answers (part 1) ... Types of Cookies: session cookie Also called a transient cookie, a cookie that is erased when you close the Web browser. This function can also be used for spelling applications. 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. It takes two arguments: $filename and $mode. The “session cookie” is alive for the browsing sessions. PHP cookies. If you do have any relevant experience, make sure to explain about what you learned and implemented during the certification course. 34) How can we access the data sent through the URL with the GET method? No, a parent constructor have to be called explicitly as follows: 62) What's the difference between __sleep and __wakeup? Q9. PHP session module always uses a cookie for session management, therefore, since session management cookies are “session cookie” by default such as Cookie with 0 … Sessions store data on the server, not on the browser like cookies. 1. PHP Create/Retrieve a Cookie. 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. Magic methods are member functions that are available to all the instances of a class. 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. 73) What is the difference between $_FILES['userfile']['name'] and $_FILES['userfile']['tmp_name']? Required fields are marked *. Is PHP a case-sensitive scripting language? PHP Interview Questions And Answers For Experienced 2020. 91) Is it possible to submit a form with a dedicated button? Whenever a session is created, a cookie containing the unique session id is stored on the user’s computer and returned with every request to the server. Cookies are stored in browser as a text file format. If we would like to pass values through a form or an URL, then we need to encode and to decode them using htmlspecialchars() and urlencode(). PEAR stands for PHP Extension and Application Repository. 30) How be the result set of Mysql handled in PHP? 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. Note: Properties cannot be declared as final. $a and $b: TRUE if both $a and $b are TRUE. They are single-line comments and multi-line comments. 15) What type of operation is needed when passing values through a form or an URL? Q3. The boolean function isset determines if a variable is set and is not NULL. 89) What is the difference between the functions strstr() and stristr()? quite helpful. So you should be thorough and should provide a detailed answers for basic questions. Just use the PHP command line interface (CLI) and specify the file name of the script to be executed as follows: 7) How to run the interactive PHP shell from the command line interface? This creates a lot of competition when it comes to applying for jobs. The set_time_limit(0) added at the beginning of a script sets to infinite the time of execution to not have the PHP error 'maximum execution time exceeded.' Q6. 80) What are the two main string operators? The php developer interview questions and answers are available now and waiting for you to make use of it. The difference lies in the name. Variables and … The cookie will expire after 30 days (86400 * 30). $_FILES['userfile']['tmp_name'] represents the temporary filename of the file stored on the server. It is used to make the site password-protected. Q10. Web sites often use cookies to store user preferences or other information that is client-specific. PHP sessions improve upon cookies because they allow web applications to store and retrieve more information than cookies. It is used to recognize the user. But Session work instead like a token allowing access and passing information while the user has their browser open. The question was, can PHP session be set and read, used, if Cookies are disabled in users Browser? A session is a logical object enabling us to preserve temporary data across multiple PHP pages. 38) How do I check if a given variable is empty? mysqli_affected_rows() return the number of entries affected by an SQL query. It allows users to access individual cookies and set them as per requirement. $_ENV is an associative array of variables sent to the current PHP script via the environment method. $_FILES['userfile']['name'] represents the original name of the file on the client machine. The actual bits of information, or what those bits actually are, is up to you, the programmer. 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. For instance, you could send a cookie that contains the user’s name. Cookies are entities used to identify unique users in the architecture. 3) Which programming language does PHP resemble? However, foreach provides an easy way to iterate over arrays, and it is only used with arrays and objects. We can test if two objects are referring to the same instance of the same class by the use of the identity operator '==='. The session variable can store more data than the cookie variable. PHP is a server side scripting language. 53) Will a comparison of an integer 12 and a string "13" work in PHP? The functions are getimagesize() for size, imagesx() for width and imagesy() for height. If we want to check whether a variable has a value or not, it is possible to use the empty() function. $_FILES is an associative array composed of items sent to the current script via the HTTP POST method. Q7. Special characters such as +, %, -, &, etc. A session ends when the user closes the browser or after leaving the site, the server will terminate the session after a predetermined period of time, commonly 30 minutes duration. The Top PHP Interview Questions blog is segmented into three divisions: Q1. Core PHP Interview Questions and Answers for Freshers and 1 to 5 Years Experienced Candidates with detailed answers and code samples are covered for you in this article. What are the main characteristics of a PHP variable? Exception::getMessage lets us getting the Exception message and Exception::getLine lets us getting the line in which the exception occurred. The stripslashes function enables us to remove the escape characters before apostrophes in a string. Type hinting is used in PHP when there is a requirement to explicitly define the data type of an argument when passing it through a function. 88) How can we determine whether a variable is set? There are three main types of errors in PHP. 44) What does the function get_magic_quotes_gpc() means? PHP sessions are stored on the server generally in text files in a … 100) Is it possible to use COM component in PHP? (Question provided by Merlyn Coslett). 42) How is it possible to remove escape characters from a string? Typically, these templates will include variables—like {$variable}—and a range of logical and loop operators to allow adaptability within the templates. The CodeIgniter can be used to develop any kind of web project from small website to large scale of application. For example, it is possible to write a .csv file, to choose for example comma as a separator between fields and then to open the file with Excel. You can also configure your client to speak to a particular set of instances. What is an Interface in PHP? Good communication and hardworking person. Yes, it is possible to share a single instance of Memcache between multiple projects. NULL is not case sensitive in PHP and can be declared in two ways as shown below: Both of the above syntaxes work fine in PHP. They are as follows: Following are some of the most important aspects of the usage of variables in PHP: Next up on these PHP interview questions for freshers, you need to understand what NULL is. How can we display the output directly to the browser? It is only methods and classes that get to be final. The Zend Engine provides memory and resource management and other standard services for the PHP language. 48) How is it possible to return a value from a function? Q3. Q4. On the OnClick event of a label in the form, a JavaScript function can be called to submit the form. HTTP (hyper text transfer protocol) is a stateless protocol. Sessions are passed in browser cookies, which are little extra bits of information that get sent to and from a web browser. Session tracking using Cookies can also be used with other mechanism of Session Tracking like url rewriting. 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