Next up on these core PHP interview questions, you have to understand to connect a URL with PHP. The crypt() function is widely used for this functionality as it provides a large amount of hashing algorithms that can be used. Using a Hyperlink: On clicking the link, a JavaScript function can be called. 43) How can we automatically escape incoming data? The second is ('.='), which appends the argument on the right to the argument on the left. You cannot assign any other value to it. 41) How do I escape data before storing it in the database? PHP Create/Retrieve a Cookie. What is an Interface in PHP? This function is used to define and pull out the values of the constants easily. The first expression is executed once at the beginning. FPDF is a PHP class, which allows generating PDF files with pure PHP (without using PDFlib). This function can open a file or a URL as per requirement. Various magic methods used in PHP5 are: PEAR is an acronym for PHP Extension and Application Repository. 17) What is needed to be able to use image function? PHP development is one of the most coveted jobs in the world of web development as well. Next up on these core PHP interview questions, you need to know the difference between an indexed and an associative array. $_COOKIE is an associative array of variables sent to the current PHP script using the HTTP Cookies. The php developer interview questions and answers are available now and waiting for you to make use of it. NULL is a special data type in PHP used to denote the presence of only one value, NULL. PHP sessions improve upon cookies because they allow web applications to store and retrieve more information than cookies. To be able to display the output directly to … 84) What is the goto statement useful for? When a new session creates the cookie with the session id is stored on the visitor’s computer. Yes, HTML and PHP interaction is the core of what makes PHP what it is. It will make a variable undefined. A soundex key is a 4-character long alphanumeric string that represents the English pronunciation of a word. 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 To be able to connect to a MySQL database, we must use mysqli_connect() function as follows: 29) What is the function mysql_pconnect() useful for? 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 function parse_ini_file() enables us to load in the ini file specified in filename and returns the settings in it in an associative array. Q8. However, it can also resume an existing session if it is stopped. The Zend Engine provides memory and resource management and other standard services for the PHP language. Using PHP, you can restrict users to access some pages of your website. The unlink() function is dedicated for file system handling. To know more about PHP, enroll in our Online PHP Training Course now! How is a PHP script executed? The use of the function session_start() lets us activating a session. mysql_pconnect() ensure a persistent connection to the database, it means that the connection does not close when the PHP script ends. The constant() function is used to retrieve the values predefined in a constant variable. It extends PHP and provides a higher level of programming for web developers. I told them not, beacuse PHP Sessions by default depends on setting a session cookie. When the original if was followed by: and then the code block without braces. Exception::__toString gives the String representation of the exception. PHP - 101 PHP interview questions and 523 answers by expert members with experience in PHP subject. The FileNotFoundException is a good example of a compile-time exception. The session variable can store more data than the cookie variable. The session variable can store more data than the cookie variable. This is done by making use of the JavaScript submit() function easily. PHP interview questions and answers.These questions are frequently asked in all IT Companies in India.This Questions are very helpfull for freshers. Discuss each question in detail for better understanding and in-depth knowledge of PHP A variable value assignment happens using the ‘=’ operator. Yes, PHP supports the use of variable length argument functions. This is used to check if there is a common presence of attributes and values between the objects in comparison. Magic methods always start with ‘__’, for example, __construct(). It is possible to use the document.form.submit() function to submit the form. 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(). The crypt () function is used to create one-way encryption. Consider the following example: With this question, the interviewer is trying to assess if you have any exposure to real-time projects and hands-on experience. The function eregi_replace() is identical to the function ereg_replace() except that it ignores case distinction when matching alphabetic characters. Cookies are recreated from backups stored outside the web browser’s dedicated cookie storage. The “session cookie” is alive for the browsing sessions. SURVEY . 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PHP finds itself among the top languages because of its ability to have a large impact on the outcome with very little code. 42) How is it possible to remove escape characters from a string? 25) What does the PHP error 'Parse error in PHP - unexpected T_variable at line x' means? Smarty is a template engine written in PHP. 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. The function mysqli_num_rows() returns the number of rows in a result set. Next up on this PHP developer interview questions, it is vital that you know about PHP in detail. A session is a logical object enabling us to preserve temporary data across multiple PHP pages. There are many CMS that are used in PHP. How can we display the output directly to 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. This is used further to store data into a variable, and then you can use it when required without the requirement of defining it again. There is also the » Panda module. PHP sessions actually use cookies, but they add more functionality and security. php interview questions and answers for freshersOOPS Videos LINK ::https://www..com/watch?v=35AjG2TehuM&list=PLseCDt7XKtl7qoVptnPb2aDcp7MNe265Q The three basic classes of errors are notices (non-critical), warnings (serious errors) and fatal errors (critical errors). The difference lies in the name. PHP and Javascript cannot directly interact since PHP is a server side language and Javascript is a client-side language. You add, delete, modify elements within your database thru PHP. Constants, as the name suggests, cannot be changed after definition. For instance, you could send a cookie that contains the user’s name. PHP session: when any user made any changes in a web application like the sign in or out, the server does not know who that person on the system is. PHP can handle forms, i.e. PHP 5 presents many additional OOP (Object Oriented Programming) features. 91) Is it possible to submit a form with a dedicated button? An exception that interrupts the script while running is called a runtime exception. Variables and their declaration in PHP are completely case sensitive while function names are not. Comprehensive, community-driven list of essential PHP interview questions. If it is different, then the runtime will stop as an exception will be raised. Session cookies do not collect information from yourcomputer. It is preferable to use crypt() which natively supports several hashing algorithms or the function hash() which supports more variants than crypt() rather than using the common hashing algorithms such as md5, sha1 or sha256 because they are conceived to be fast. It is not holding the multiple variable in cookies. HTTP (hyper text transfer protocol) is a stateless protocol. 97) Is it possible to extend the execution time of a PHP script? Next up on this top PHP interview questions and answers blog, let us take a look at the advanced questions. FPDF requires no extension (except zlib to activate compression and GD for GIF support) and works with PHP4 and PHP5. 31) How is it possible to know the number of rows returned in the result set? For an interview for PHP freshers, interviewer will try to grasp his basic knowledge than a wide knowledge. :: is used to access static methods that do not require object initialization. PHP sessions actually use cookies, but they add more functionality and security. PEAR stands for PHP Extension and Application Repository. This amount of efficiency has been the requirement for the past couple of years in the industry. Break: This statement is used in a looping construct to terminate the execution of the iteration and to immediately execute the next snippet of code outside the block of the looping construct. Difference Between Session and Cookie in PHP. This function is case-sensitive. Server script sends a set of cookies to the browser. Just use the PHP CLI program with the option -a as follows: 8) What is the correct and the most two common way to start and finish a PHP block of code? 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. When a new session creates the cookie with the session id is stored on the visitor’s computer. It is composed of three expressions: a condition, and two operands describing what instruction should be performed when the specified condition is true or false as follows: 57) What is the function func_num_args() used for? PHP has a plethora of uses for developers. setcookie ( ) function. Sessions are passed in browser cookies, which are little extra bits of information that get sent to and from a web browser. 38) How do I check if a given variable is empty? The "/" means that the cookie is available in entire website (otherwise, select the directory you prefer). Version 7.1 or 7.2 is the recommended version of PHP. Read on. Let's consider following examples to understand the concept of Session and cookies Example 1: Lets create a page test.php. The first code is faster than the second code especially for large large sets of data. 86) What does the expression Exception::__toString means? Is PHP a case-sensitive scripting language? This is used to initialize the variables for the particular object in consideration. Yes, it is possible by setting the cookie with a past expiration time. An interface is a contract to provide the implementation of different … 101) Explain whether it is possible to share a single instance of a Memcache between multiple PHP projects? The functions are getimagesize() for size, imagesx() for width and imagesy() for height. The popular ones are as mentioned below: There are two ways to use comments in PHP. Each time when client sends request to the server, cookie is embedded with request. XML is the acronym for Extensible Markup Language. In PHP a session must takes care of following two things: Session tracking information Storing information associated with a session. JavaScript is a client-side programming language, while PHP is a server-side scripting language. 1. They are started with $_SESSION global variable. The following example creates a cookie named "user" with the value "John Doe". This is done to get useful information from the client for the development of various aspects of the server. A metaphone key represents how a string sounds if it is pronounced by an English (native) person. 10 Questions Show answers. 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. stristr() is identical to strstr() except that it is case insensitive. mysqli_affected_rows() return the number of entries affected by an SQL query. To access the data sent via the GET method, we use $_GET array like this: 35) How can we access the data sent through the URL with the POST method? Very nice list of PHP questions and answers for freshers. 30 seconds . 73) What is the difference between $_FILES['userfile']['name'] and $_FILES['userfile']['tmp_name']? 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. Cookies are text files stored on the client computer and they are kept of use tracking purpose. PHP Cookie. as a result, it will not expires. 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. PHP interview questions and answers.These questions are frequently asked in all IT Companies in India.This Questions are very helpfull for freshers. The Top PHP Interview Questions blog is segmented into three divisions: What are the types of variables present in PHP? It is a small file that the server plants into the client system. Yes, we use the urlencode() function to be able to protect special characters. Answer: Sessions tracking using Cookies are more secure and fast. The soundex() function can be used for spelling applications. PHP is one of the world’s most renowned scripting languages which is used for web development. If we want to check whether a variable has a value or not, it is possible to use the empty() function. file_get_contents() lets reading a file and storing it in a string variable. PHP Interview Question #16. PHP Scripts are loaded into memory and compiled into Zend OPCodes. These OPCodes are executed and the HTML generated is sent to the client. 3600 sec. 79) what the difference between the 'BITWISE AND' operator and the 'LOGICAL AND' operator? PHP Interview Questions. Cookies are stored in browser as a text file format. Data structure multiple choice questions Career 12-19-2011 04:54 AM PHP multiple choice questions Preparation for MySQL test Preparation for MySQL test Rahul 11-9-2011 05:57 AM PHP multiple choice questions Preparation for PHP test Preparation for PHP test Kunal 11-9-2011 05:56 AM PHP multiple choice questions Good test. To be able to verify whether a PHP variable is an instantiated object of a certain class we use instanceof. It is possible to use the dedicated function, is_numeric() to check whether it is a number or not. 27) What is the function file_get_contents() useful for? 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.' Q. The metaphone() function calculates the metaphone key of a string. Can sessions work without cookies? When PHP changes you can update Memcached by. 66) How can you propagate a session id? Your email address will not be published. PHP is a server-side scripting language, while HTML is a client-side language. PHP supports only single inheritance; it means that a class can be extended from only one single class using the keyword 'extended'. There are many frameworks in PHP that are known for their usage. $_SERVER is an array including information created by the web server such as paths, headers, and script locations. Next up on these PHP interview questions for freshers, you need to understand what PEAR is. A function returns a value using the instruction 'return $value;'. Q10. This simply means that you can pass any number of arguments to a function. It is used to make the site password-protected. The goto statement can be placed to enable jumping inside the PHP program. Magic methods are member functions that are available to all the instances of a class. $GLOBALS is associative array including references to all variables which are currently defined in the global scope of the script. It is possible to pass the variables between the PHP pages using sessions, cookies or hidden form fields. We have written some important interview questions on PHP for freshers 2020-21 In this page session variables will be created as follows: PHP sessions improve upon cookies because they allow web applications to store and retrieve more information than cookies. In each iteration, expr2 is evaluated. expr3 is tested at the end of each iteration. 26) What should we do to be able to export data into an Excel file? A persistent cookie is permanently stored in a cookie file on the browser's computer. Exception::getMessage lets us getting the Exception message and Exception::getLine lets us getting the line in which the exception occurred. If the function require() cannot access the file then it ends with a fatal error. $a & $b: Bits that are set in both $a and $b are set. It is possible to generate HTML through PHP scripts, and it is possible to pass pieces of information from HTML to PHP. What are the main characteristics of a PHP variable? 20) How failures in execution are handled with include() and require() functions? They do not require the PHP syntax of starting with the conventional $ sign. 54) How is it possible to cast types in PHP? 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. The strip_tags() function enables us to clean a string from the HTML tags. This provides the basic means to differentiate a piece of PHP code from the other aspects of the program. imagetypes() gives the image format and types supported by the current version of GD-PHP. Basic. This process is repeated until the end of the array. When this function is first called, PHP will run a quick check to analyze the presence of all the data types that are specified. The two most common ways to start and finish a PHP script are: 9) How can we display the output directly to the browser? Q7. Every single session is tagged with a unique server ID that is later used to work with the storage and retrieval of values. 89) What is the difference between the functions strstr() and stristr()? PHP cookies. It is stored unlimited amount of data.It is holding the multiple variable in sessions. The session_unregister() function unregister a global variable from the current session and the session_unset() function frees all session variables. The unset() function is dedicated for variable management. $_FILES is an associative array composed of items sent to the current script via the HTTP POST method. The CodeIgniter can be used to develop any kind of web project from small website to large scale of application. PHP provides you with the ‘==’ operator, which is used to compare two objects at a time. The mysqli_fetch_object() function collects the first single matching record where mysqli_fetch_array() collects all matching records from the table in an array.

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