Also Read: Laravel interview questions. Here is a sample class with a constructor and destructor in PHP. PHP supports 9 primitive types 4 scalar types: integer boolean float string 3 compound types: array object callable And 2 special types: resource NULL Suggested Read: Zend Framework interview questions. NO, multiple inheritance is not supported by PHP.
You can add redirect in PHP by adding below code snippet in your file. You may also Like Codeigniter interview questions Below are some features of mbstring It handles the character encoding conversion between the possible encoding pairs. Offers automatic encoding conversion between the possible encoding pairs. Supports function overloading feature which enables to add multibyte awareness to regular string functions.
Provides multibyte specific string functions that properly detect the beginning or ending of a multibyte character. Print in PHP print is language constructs that display strings.
Bookmarked: Can be bookmarked. Can not be bookmarked. The browser usually alerts the user that data will need to be re-submitted. Parameters: can send but the parameter data is limited to what we can stuff into the request line URL. Safest to use less than 2K of parameters, some servers handle up to 64K Can send parameters, including uploading files, to the server.
No restrictions. Binary data is also allowed. A safe URL length limit is often characters but varies by browser and web server. No restrictions Usability: GET method should not be used when sending passwords or other sensitive information.
POST method used when sending passwords or other sensitive information. Visibility: GET method is visible to everyone it will be displayed in the browsers address bar and has limits on the amount of information to send. Cached: Can be cached Not Cached Large variable values: characters maximum size.
Command line scripting In this area of web development, with just the use of PHP parser, the PHP script is executed with no requirement of any server program or browser. This type of use of the PHP script is normally employed for simple and easy processing tasks. The following are involved in Server-side scripting: Web server — It is a program that executes the files from web pages, from user requests.
PHP parser — It is a program that converts the human-readable code into a format that is easier to understand by the computer. Desktop Application Development PHP is also used to create client-side application such as desktop applications.
Open Source PHP is an open source software, which means that it is freely available for modifications and redistribution, unlike any other programming language. There is also an active team of PHP developers who are ready to provide any kind of technical support when needed. Cross Platform The PHP programming language is easy to use and modify and is also highly compatible with the leading operating systems as well as the web browsers.
And, that made the deployment of the applications across a wide range of operating systems and browsers much easier than before. MCrypt is was deprecated in PHP 7. GD is an open source library for creating dynamic images. It is also used for creating charts and graphics on the fly.
PEAR provides: A structured library of code maintain a system for distributing code and for managing code packages promote a standard coding style provide reusable components. Session and cookie both are used to store values or data. Session destroys that when browser close and cookie delete when set time expires. Both are used to make the changes to your PHP setting. These are explained below: php.
They both used to sort an associative array in PHP. You just follow the below steps: 1. Open the command prompt. Press the enter key and your script will execute. There are many differences between PHP 5 and 7. Some of the main points are: Performance : it is obvious that later versions are always better than the previous versions if they are stable. Return Type : In PHP 5, the programmer is not allowed to define the type of return value of a function which is the major drawback. But in PHP 7, this limitation is overcome and a programmer is allowed to define the return type of any function.
Error handling : In PHP 5, there is high difficulty to manage fatal errors but in PHP 7, some major errors are replaced by exceptions which can be managed effortlessly. It is basically used when you need to execute the class only once to increase the execution time.
Another operator has added is a null coalescing operator which symbol as?? The explode and split functions are used in PHP to split the strings. Both are defined here: Split is used to split a string into an array using a regular expression whereas explode is used to split the string by string using the delimiter. There are three types of access specifiers in PHP which are: Private: Members of a class are declared as private and they can be accessed only from that class.
Protected: The class members declared as protected can be accessed from that class or from the inherited class. Public: The class members declared as public can be accessed from everywhere. Heredoc string uses double quotes "" while nowdoc string uses single quote '' Parsing is done in heredoc but not in nowdoc. Headers refer to additional information like from, Cc, Bcc. These are optional. Parameters refer to an additional parameter to the send mail program.
It is also optional. The difference between MD5 and SHA is that the former takes less time to calculate than later one.
SHA is difficult to handle than MD5 because of its size. Syntax: exit message Where massage is a parameter to be passed as an argument. It defines message or status. Exceptions of exit : If no status is passed to exit , then it can be called without parenthesis. If a passed status is an integer then the value will not be printed but used as the exit status.
The range of exit status is from 0 to where is reserved in PHP. Errors And Exceptions exit can be called without parentheses if no status is passed to it.
Exit function is also known by the term language construct. If the status passed to an exit is an integer as a parameter, that value will be used as the exit status and not be displayed. The range of exit status should be in between 0 to Overriding and Overloading both are oops concepts. An example of Overriding in PHP. Online Training Programs. Few Pros and Cons of PHP Pros Cons Simple to create web pages and it has the tools to create the main homepage in a well-designed manner Due to the low barrier of entry, it is not easy to explore a high stage of talent in PHP.
PHP is gigantic and is popular in the whole world thus it has a bunch of online training sites Best PHP application is less in financial status than that of the average Java application. For the most part, all PHP variables only have a single scope. This single scope spans included and required files as well. To be able to verify whether a PHP variable is an instantiated object of a certain class we use instanceof. The goto statement can be placed to enable jumping inside the PHP program.
The target is pointed by a label followed by a colon, and the instruction is specified as a goto statement followed by the desired target label. Exception::getMessage lets us getting the Exception message and Exception::getLine lets us getting the line in which the exception occurred. The string function strstr string allString, string occ returns part of allString from the first occurrence of occ to the end of allString. This function is case-sensitive.
The first expression is executed once at the beginning. In each iteration, expr2 is evaluated. If it is TRUE, the loop continues, and the statements inside for are executed. However, foreach provides an easy way to iterate over arrays, and it is only used with arrays and objects. It is possible to use the document. The three basic classes of errors are notices non-critical , warnings serious errors and fatal errors critical errors.
It is possible to pass the variables between the PHP pages using sessions, cookies or hidden form fields. The default limit is 30 seconds. Yes, it is possible to share a single instance of Memcache between multiple projects. Memcache is a memory store space, and you can run memcache on one or more servers. You can also configure your client to speak to a particular set of instances.
It can be placed to support jumping inside the PHP program. It applied to go into another area of the code. I can use stripslashes function. It allows us to remove the escape characters before apostrophes in a string. I can allow the Magic quotes entry in the configuration file of PHP. I will be helping you to escape incoming data. It allows us to remove a string from the HTML tags. Explain which cryptographic extension present generation and verification of digital signatures?
It will help to pass a variable. A conditional statement will end when the original if was followed by : and then the code block without any braces. The ternary operator is a set of three expressions: a condition, and two operands defining what instruction need to be executed when the named condition is true or false like below:.
The definition of a session is a logical object allowing us to store temporary data over various PHP pages. PHP gives a large number of predefined constants to any script which it runs known as magic constants. It is also called as a Permanent cookie. A persistent cookie is permanently saved in a cookie file on the computer. The php. It can be utilized instead of a global keyword to access variables from global scope. For example headers, paths, and script locations. It is an associative array of variables sent to the latest PHP script through the environment method.
To set real environment variables, you need to use putenv. It returns the number of rows in the result set. This will provide access to the data through the field names. The function unlink is applied for file system handling. It just deletes the file given as entry. The sessions will automatically end when the PHP script stops executing.
In PHP, session will end automatically once the script finishes executing. But you can also end manually using,. Do you want to become a PHP developer? If you are looking for a job in web development, we hope these PHP interview questions and answers will get you on the right track of finding a good developer for your needs. This professional course will assist you to get advanced knowledge in PHP and become a full-stack web developer.
We would advise you read this blog because it provides an insight of the following: A significant PHP Interview Questions and Answers which will be very helpful for those who are trying for a job in web development and want to start a career in PHP. What is PHP? What types of loops exist in PHP?
How do you display the output directly to the browser? Describe which programming language does PHP parallel to? How to create a MySQL connection? How to select a database? What is PEAR? In PHP, Ksort is used to sort an array by key in reverse order. What are the data types of PHP? Which PHP version is actually used today? Nowadays, PHP 7 is the actually used version.
What is NULL? What is the use of Constant Function? What is the correct way to start and complete a PHP block of code? Does PHP support multiple inheritances? In PHP 5, you have to name your constructors. In PHP 5, interfaces are introduced. What are tags used? What is the difference between explode and split functions? Is PHP supports multiple inheritance? What is the use of count function in MySQL? How to send a mail in PHP? Explain what the meaning of a final class and a final method is?
How can you break PHP script? I can use exit function for that. What is the default page in web server? Most of the times it will be index page. Explain how a comparison of objects done in PHP 5 is? What are the different types of errors in PHP? There are 4 basically types of error in PHP. Parse Error — Commonly caused due to syntax mistakes in codes. Warning Error — This error occurs when you try to include a file that is not present.
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