The ________ method in an exception class gets the exception message.
- getMessage()
- getExceptionMessage()
- fetchMessage()
- retrieveErrorMessage()
The correct method for retrieving the exception message in an exception class is getMessage(). This method returns a string describing the exception.
What is the primary purpose of the error_reporting() function in PHP?
- To hide errors
- To display PHP version information
- To set the error reporting level
- To suppress error messages
The error_reporting() function is used to set the error reporting level, allowing developers to control which errors are displayed, aiding debugging.
Why is it advisable to use exit() or die() after triggering a user-level error in PHP?
- To immediately halt script execution on error
- To allow the script to continue running, ignoring the error
- To provide a detailed error message to the user
- To log the error and continue script execution
Using exit() or die() after a user-level error is advisable because it immediately halts the script execution, preventing further processing that may lead to undesirable consequences due to the error.
The function in PHP that converts a JSON string into a PHP object is ________.
- json_decode()
- json_encode()
- json_parse()
- json_serialize()
To convert a JSON string into a PHP object in PHP, you should use the 'json_decode()' function. It parses the JSON data and creates a PHP object.
You've been tasked with improving the security of an existing web application. Upon review, you notice that the application doesn't validate or sanitize user input before processing. Which potential vulnerabilities could this introduce?
- SQL Injection, Cross-Site Scripting (XSS), Command Injection, and more
- Better User Experience, Improved Performance, Data Integrity
- Enhanced Scalability, Improved Caching, Reduced Latency
- No Significant Impact on Security
Failing to validate and sanitize user input can introduce serious vulnerabilities like SQL Injection, XSS, Command Injection, and more. It can compromise the application's data, security, and integrity. The other options may bring some benefits, but the security risks outweigh them.
Which of the following PHP functions is used to check if a given key or index exists in an array?
- key_exists
- in_array
- array_key_exists
- index_exists
To check if a given key or index exists in a PHP array, you should use the array_key_exists function. This function checks if a specific key exists in an array, which is particularly useful for associative arrays.
Consider you are building a search functionality for your website. Which function would you use to determine if a particular keyword exists within a content string?
- strpos()
- str_replace()
- str_word_count()
- str_split()
The strpos() function is used to find the position of a substring (keyword) within a string. It returns the position or false if not found, making it suitable for searching within a content string.
The ________ function in PHP returns an array of files and directories from the specified directory.
- file_get_contents
- dir()
- scandir()
- list_dir()
The scandir() function is used in PHP to return an array of files and directories in a specified directory. It's commonly used for directory listing operations.
How do you define a constant in PHP?
- define('MY_CONSTANT', 'constant value');
- $constant('MY_CONSTANT')
- constant('MY_CONSTANT')
- MY_CONSTANT = 'constant value';
In PHP, you define a constant using the define function. The correct syntax is define('CONSTANT_NAME', 'constant_value').
What does the PHP array_merge() function do?
- Combines two or more arrays into one
- Multiplies elements of two arrays
- Checks if an array is empty
- Sorts the elements of an array
The array_merge() function in PHP combines two or more arrays into a single array, preserving the keys and their corresponding values from all input arrays.