What is the correct way to define a user-defined function in PHP?
- function myFunction() { }
- def myFunction():
- public function myFunction() {}
- def func myFunction():
In PHP, a user-defined function is defined using the 'function' keyword, followed by the function name and parentheses for parameters. The function body is enclosed in curly braces.
In PHP, how can you prevent file caching when reading a file?
- Use file_get_contents() with caching disabled
- Use fopen() with the appropriate caching flags
- Set appropriate headers using the header() function
- Use readfile() with caching options
To prevent file caching when reading a file in PHP, you can set appropriate headers using the header() function. This approach instructs the client not to cache the file. Options 1 and 2 do not specifically address caching.
Which PHP function is particularly useful for validating and filtering data coming from insecure sources?
- filter_var()
- isset()
- htmlentities()
- array_push()
The filter_var() function in PHP is particularly useful for validating and filtering data coming from insecure sources. It allows you to apply various filters, such as validating email addresses or sanitizing input, to ensure that the data is safe and adheres to the desired format.
In a typical CRUD operation, what does the "U" stand for?
- Update
- Utilize
- Understand
- Unify
In a typical CRUD (Create, Read, Update, Delete) operation, "U" stands for "Update." It signifies the process of modifying existing data in a database or system.
How can you prevent the display of PHP errors on a production website while still logging them?
- Set display_errors to Off in PHP configuration
- Use error_reporting(E_ALL) to suppress error display, while configuring a custom error handler for logging
- Enable error_reporting(E_ALL) to display errors only for the admin
- Use PHP's debug_backtrace() to hide errors from public view, while logging them
To prevent the display of PHP errors on a production website while logging them, you should configure a custom error handler to log errors and set display_errors to Off in the PHP configuration.
The practice of writing code that anticipates and gracefully handles potential issues is known as ________.
- Exception Handling
- Defensive Programming
- Code Optimization
- Bug Avoidance
Defensive Programming involves proactively addressing potential issues in code, making it more robust and error-resistant.
In PHP, the namespace separator is represented by ________.
- .
- :
- ;
In PHP, the backslash () is used as the namespace separator. It's used to separate namespaces and access classes and functions within namespaces.
When a form is submitted, the actual method used for sending data can be found in the PHP superglobal called ________.
- $_SERVER
- $_REQUEST
- $_POST
- $_METHOD
The method used for sending data when a form is submitted can be found in the PHP superglobal $_POST.
In PHP, the session data is serialized using the ________ mechanism.
- Object-Oriented
- Session-Cookie
- Serialize-Deserialize
- URL Rewriting
The correct option is "Serialize-Deserialize" mechanism. PHP uses serialization to store session data as a serialized string.
Which control structure is best suited for executing a block of code multiple times based on a condition?
- if statement
- for loop
- switch statement
- while loop
A 'for' loop is ideal for executing code repeatedly based on a condition, typically with an initialization, condition, and increment expression.
When using PDO in PHP, which method is typically used to execute a prepared statement?
- execute()
- query()
- fetch()
- prepare()
In PDO (PHP Data Objects), the 'execute()' method is typically used to execute a prepared statement. It is used after preparing the statement with 'prepare()' to execute the query.
Which superglobal array is used to access session variables in PHP?
- $_GET
- $_POST
- $_SESSION
- $_COOKIE
The superglobal array used to access session variables in PHP is $_SESSION. It stores session data that can be accessed across multiple pages during a user's session.