Php Interview Questions And Answers For Experienced
Top PHP Interview Questions and Answers for Experienced Professionals
Php Interview Questions And Answers For Experienced
Php Interview Questions And Answers for Experienced are aimed at testing the technical knowledge and practical skills of a candidate. These questions cover various concepts like PHP syntax, object-oriented programming, database connectivity, and handling errors. Experienced candidates are expected to have a strong understanding of these concepts and should be able to provide real-world examples to support their answers. Employers may also ask questions about the candidate's past projects, their experience working with different PHP frameworks, and their problem-solving abilities. Overall, the purpose of these interview questions is to assess the candidate's proficiency in PHP and their ability to handle complex coding scenarios.
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1 - What is the difference between include() and require() functions in PHP?
Answer: include() and require() are both used to include and evaluate external files in a PHP script. The main difference is that if the file specified in the function is not found, require() will cause a fatal error and stop the script execution, while include() will only produce a warning and continue the execution.
2) What is the difference between GET and POST methods in PHP?
Answer: GET and POST are both used in HTTP requests to transfer data between a client and a server. The difference lies in how the data is transferred GET appends the data to the URL while POST sends it in the body of the HTTP request. Additionally, GET has a limit on the amount of data that can be transferred while POST does not.
3) What is the use of the global keyword in PHP?
Answer: The global keyword is used to access global variables from within a function. By default, variables defined within a function have a local scope and cannot be accessed outside the function. The global keyword allows us to access and modify global variables from within a function.
4) What is the use of session and cookies in PHP?
Answer: Sessions and cookies are used to store information about a user's interaction with a website. Sessions store user information on the server while cookies store it on the client side. They are commonly used to keep a user logged in and to store user preferences and settings.
5) What is the use of htmlentities() function in PHP?
Answer: The htmlentities() function is used to convert special characters in a string to HTML entities. This is useful when processing user input to prevent malicious code from being executed.
6) How is a MySQL database connection established in PHP?
Answer: To establish a connection to a MySQL database in PHP, the mysqli or PDO (PHP data objects) extension can be used. A connection can be made by passing the database hostname, username, password, and database name as parameters to the respective functions.
7) What is the use of the explode() function in PHP?
Answer: The explode() function is used to split a string into an array based on a specified delimiter. This is useful when dealing with data that is separated by a common character, such as a CSV file.
8) What is the difference between a function and a method in PHP?
Answer: A function is a block of code that can be called and executed multiple times within a script, while a method is a function that is associated with an object or a class. A method can access and modify the data of an object, while a function cannot.
9) What is the use of the header() function in PHP?
Answer: The header() function is used to send HTTP headers to the client. This is useful when dealing with redirects, setting cookies, and caching rules.
10) What is the use of the getimagesize() function in PHP?
Answer: The getimagesize() function is used to get the size and type of an image file. This is useful when needing to validate the type and dimensions of an uploaded image.
11) How can error logging be enabled in PHP?
Answer: Error logging can be enabled by setting the error_reporting and display_errors directives in the php.ini file. Additionally, the error_log function can be used to specify a custom error log file.
12) What is the use of the isset() function in PHP?
Answer: The isset() function is used to determine if a variable has been set and is not null. This is useful for handling form data and checking if a variable has been initialized.
13) What is the use of the __construct() function in PHP?
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Answer: The __construct() function is a special function that is automatically called when an object is created from a class. This is used to initialize the object's properties and methods.
14) How can a file be uploaded using PHP?
Answer: A file can be uploaded using the $_FILES superglobal variable and the move_uploaded_file() function. The file input in a form should have the enctype attribute set to “multipart/form data” and the PHP.ini file should have the “file_uploads” directive set to On.
15) What is the difference between POST and PUT methods in PHP?
Answer: POST and PUT methods are both used to send data in an HTTP request. The main difference is that PUT is used to update existing resources, while POST is typically used to create new resources. Additionally, PUT requires the data to be sent in a specific format, while POST does not have such restrictions.
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