86) What does the expression Exception::__toString means? A session is a logical object enabling us to preserve temporary data across multiple PHP pages. Q3. The default session time in php is until the closing of the browser. Being an anonymous function, the lambda function is used to first store data into a variable and then to pass it as arguments for the usage in other methods or functions. 41) How do I escape data before storing it in the database? The time limit can be set to zero to impose no time limit. A persistent cookie is permanently stored in a cookie file on the browser's computer. Sessions are passed in browser cookies, which are little extra bits of information that get sent to and from a web browser. So you should be thorough and should provide a detailed answers for basic questions. Special characters such as +, %, -, &, etc. How are constants defined in PHP? PHP - 101 PHP interview questions and 523 answers by expert members with experience in PHP subject. There is also the » Panda module. No, a parent constructor have to be called explicitly as follows: 62) What's the difference between __sleep and __wakeup? So, why you are waiting for spend your valuable time with us and make the dream true. For example, user-defined functions in PHP can be defined in uppercase but later referred to in lowercase, and it would still function normally. This function is used to define and pull out the values of the constants easily. Very nice list of PHP questions and answers for freshers. stristr() is identical to strstr() except that it is case insensitive. Alongside containing some of the PHP libraries, it also provides you with a simple interface to automatically install packages. If the client browser does not support cookies, the unique php session id is displayed in the URL; Sessions have the capacity to store relatively large data compared to cookies. A metaphone key represents how a string sounds if it is pronounced by an English (native) person. This function is case-sensitive. You can also configure your client to speak to a particular set of instances. Magic methods are member functions that are available to all the instances of a class. Hence, hashing passwords with these algorithms can create vulnerability. Variables can only begin with letters or underscores. The second is ('.='), which appends the argument on the right to the argument on the left. How can we display the output directly to the browser? The default limit is 30 seconds. PHP interview questions and answers.These questions are frequently asked in all IT Companies in India.This Questions are very helpfull for freshers. Is PHP a case-sensitive scripting language? There are many frameworks in PHP that are known for their usage. In PHP a session must takes care of following two things: Session tracking information Storing information associated with a session. If it evaluates to FALSE, the execution of the loop ends. In each iteration, expr2 is evaluated. For the most part, all PHP variables only have a single scope. quite helpful. The actual bits of information, or what those bits actually are, is up to you, the programmer. If you do have any relevant experience, make sure to explain about what you learned and implemented during the certification course. This process is repeated until the end of the array. In PHP, cookies are set by using the. Here, you can learn all of the concepts thoroughly and earn a course certificate as well! database.php.default file is used for … 5) What is the actually used PHP version? As the name suggests, if there is an occurrence of any sort of exception while the script is being compiled, it is called a compile-time exception. 93) Is it possible to protect special characters in a query string? This single scope spans included and required files as well. A static variable is defined within a function only the first time, and its value can be modified during function calls as follows: 47) How can we define a variable accessible in functions of a PHP script? PHP 5 presents many additional OOP (Object Oriented Programming) features. 79) what the difference between the 'BITWISE AND' operator and the 'LOGICAL AND' operator? In this page session variables will be created as follows: The two most common ways to start and finish a PHP script are: 9) How can we display the output directly to the browser? Zend Engine is used internally by PHP as a compiler and runtime engine. 99) What is the default session time in PHP? The .htaccess file is used for URL rewrite. 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. Exception::__toString gives the String representation of the exception. 12) What is the meaning of a final class and a final method? Web sites often use cookies to store user preferences or other information that is client-specific. .Net interview questions and answers, Top 10 .Net interview questions and answers, 0-6 years experienced .Net , Linq, MVC,WEB API, ADO.Net What is PHP? There is no explicit declaration. Single-line comments can be used using the conventional ‘#’ sign. 82) What is the differences between $a != $b and $a !== $b? The extension .php is needed alongside the filename. The set_time_limit(0) added at the beginning of a script sets to infinite the time of execution to not have the PHP error 'maximum execution time exceeded.' Typically, these templates will include variables—like {$variable}—and a range of logical and loop operators to allow adaptability within the templates. A function returns a value using the instruction 'return $value;'. Session tracking using Cookies can also be used with other mechanism of Session Tracking like url rewriting. In this case, the return will be the current session if resumed. The popular ones are as mentioned below: There are two ways to use comments in PHP. The working of foreach is simple; with every single pass of the value, elements get assigned a value and pointers are incremented. The result set can be handled using mysqli_fetch_array, mysqli_fetch_assoc, mysqli_fetch_object or mysqli_fetch_row. The php developer interview questions and answers are available now and waiting for you to make use of it. The CodeIgniter can be used to develop any kind of web project from small website to large scale of application. The session cookie is stored in temporary memory and is not retained after the browser is closed. Both of these are special methods provided in PHP for you to perform complex procedures using a single step. The difference lies in the name. The system module allows users to perform a variety of system functions such as open, read, write, etc. PHP variables are not intrinsic. 54) How is it possible to cast types in PHP? mysql_pconnect() ensure a persistent connection to the database, it means that the connection does not close when the PHP script ends. The boolean function isset determines if a variable is set and is not NULL. The FileNotFoundException is a good example of a compile-time exception. We have to keep in mind that if our PHP script is written for the Web CGI interface, it may not execute properly in the command-line environment. The name of the output type has to be specified in parentheses before the variable which is to be cast as follows: * (float), (double), (real) - cast to float. The cookie will expire after 30 days (86400 * 30). $a & $b: Bits that are set in both $a and $b are set. 6) How do you execute a PHP script from the command line? Q6. 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