Top 10 Senior PHP Developer Interview Questions | Education Funda

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[Mrxrt]

what are usage of cookie in APIs ?

Cookies are a useful mechanism for managing state in web applications, including APIs. Here are some of the ways that cookies can be used in APIs:

Authentication: Cookies can be used to store authentication information, such as session tokens or access tokens, that are required to access protected API endpoints. When a user logs in, the API can set a cookie with the authentication information, and subsequent API requests can include the cookie to authenticate the user.

Tracking: Cookies can be used to track user behavior and preferences across multiple API requests. For example, an API may set a cookie to store the user's preferred language, theme, or currency, and use this information to customize the API response.

Rate Limiting: Cookies can be used to implement rate limiting in APIs. For example, an API may set a cookie that contains a counter of the number of requests made by a user in a given time period. The API can use this information to limit the number of requests made by the user.

Caching: Cookies can be used to cache API responses in the client's browser. For example, an API may set a cookie that specifies the expiration time of a response, and the client's browser can cache the response until the cookie expires. This can help to reduce the load on the API server and improve the performance of the API.

Overall, cookies can be a useful tool for managing state in APIs. However, it's important to use cookies carefully and ensure that they are used in a secure and privacy-conscious way.


what are different methods of HTTP request and explain usage ?

There are several methods of HTTP request, each with a specific purpose. The most common HTTP request methods are:

GET: The GET method is used to retrieve data from the server. The request parameters are passed in the URL as a query string. This method is typically used for retrieving information from a server, such as web pages, images, or JSON data.

POST: The POST method is used to submit data to the server. The request parameters are passed in the body of the request, and the data is typically used to create or update resources on the server. This method is commonly used for submitting form data, uploading files, or sending data in JSON format.

PUT: The PUT method is used to update an existing resource on the server. The request parameters are passed in the body of the request, and the data is used to update the resource identified by the URL. This method is commonly used for updating data in a database or other backend system.

DELETE: The DELETE method is used to delete a resource on the server. The URL identifies the resource to be deleted, and the request parameters are not used. This method is commonly used for deleting records from a database or other backend system.

PATCH: The PATCH method is used to update a part of an existing resource on the server. The request parameters are passed in the body of the request, and the data is used to update only the specified fields of the resource identified by the URL. This method is commonly used for making partial updates to records in a database or other backend system.

HEAD: The HEAD method is similar to the GET method, but it only retrieves the headers of the response, without the actual data. This method is commonly used for checking the status of a resource, such as whether it exists or is accessible.

OPTIONS: The OPTIONS method is used to retrieve information about the communication options available for a resource. This method is commonly used to retrieve metadata about the server and the available resources.

In summary, HTTP request methods are used to interact with web servers and retrieve, submit, update, or delete data. The choice of method depends on the specific use case and the type of operation that needs to be performed.


while working with sessions, how server know which user is session currently ?

When a user logs in and creates a session, the server generates a unique session ID, which is sent to the client's browser in a cookie or in the URL as a parameter. The client's browser then sends the session ID back to the server with each subsequent request.

When the server receives a request that includes a session ID, it looks up the session data in its session store (usually a database or file system) using the session ID as the key. This allows the server to retrieve the user's session data, such as their user ID or other information stored in the session.

In other words, the server knows which user is associated with a session based on the session ID that is sent with each request. The session ID serves as a unique identifier for the user's session data on the server, allowing the server to associate the session data with the correct user.

It's important to note that sessions can be vulnerable to security issues, such as session hijacking or session fixation attacks. To mitigate these risks, it's important to use secure session management practices, such as using secure cookies, regenerating session IDs on login and logout, and using session timeouts to limit the lifetime of a session.

[sivakumar]

Please provide with proper explanation also with question then it will be good useful to others

[Mrxrt]

How to get headers value while working with APIs?

In PHP, you can retrieve the headers of an HTTP request using the getallheaders() function. This function returns an associative array of all the headers in the request.


php magic methods and magic constraints in depth ?

Magic methods and magic constants are special features in PHP that allow you to handle certain operations or access certain values in a special way. Here's an overview of both:

Magic Methods:
Magic methods are special methods in PHP classes that are invoked in certain circumstances. These methods have special names that begin and end with two underscores (__). Here are some of the most common magic methods:

__construct: This is the constructor method, which is called automatically when an object of the class is created.

__destruct: This is the destructor method, which is called automatically when an object is destroyed or goes out of scope.

__call: This method is called when an undefined method is called on an object.

__get: This method is called when an undefined property is accessed on an object.

__set: This method is called when an undefined property is set on an object.

__isset: This method is called when the isset() function is called on an undefined property of an object.

__unset: This method is called when the unset() function is called on an undefined property of an object.

__toString: This method is called when an object is used in a string context (e.g. when it is echoed or concatenated with a string).

__clone: This method is called when an object is cloned using the clone keyword.

Magic Constants:
Magic constants are predefined constants in PHP that provide information about the current script, such as the current line number, file name, and function name. Here are some of the most common magic constants:

LINE: This constant represents the current line number in the script.

FILE: This constant represents the full path and filename of the current script.

DIR: This constant represents the directory of the current script.

FUNCTION: This constant represents the name of the current function.

CLASS: This constant represents the name of the current class.

METHOD: This constant represents the name of the current method.

NAMESPACE: This constant represents the current namespace.

These magic methods and constants can be useful in a variety of situations, such as debugging, creating flexible and dynamic classes, and handling errors or exceptions. However, it's important to use them judiciously and only when necessary, as they can make code harder to understand and maintain if used excessively.