PHP supports both single-line and multi-line comments.
- TRUE
- FALSE
PHP does indeed support both single-line and multi-line comments. Single-line comments can be denoted by double slashes (//) or a hash symbol (#), while multi-line comments can be enclosed between /* and */. Comments are essential for leaving notes, explaining code, or temporarily disabling blocks of code. They are ignored by the PHP interpreter, making them purely informational for developers. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php
The json_decode() function is used to decode a JSON object into a PHP array.
- method
- function
- property
- class
The json_decode() function in PHP is used to decode a JSON object into a PHP array. It is a standalone function that takes a JSON-encoded string and converts it into a PHP value, typically an array or an object. The correct option is "function." For more information, consult the PHP documentation on json_decode(): http://php.net/manual/en/function.json-decode.php
In PHP, strings can be defined using either single quotes or double quotes.
- TRUE
- FALSE
This statement is true. In PHP, strings can be defined using either single quotes ('') or double quotes (""). Both single quotes and double quotes are used to delimit string literals. The choice between single quotes and double quotes depends on the specific requirements and whether variable interpolation or escape sequences are needed. Learn more: https://www.php.net/manual/en/language.types.string.php
You have a PHP script and you need to store information about a user session. How would you do this using a superglobal?
- Use the $_SESSION superglobal.
- Use the $_COOKIE superglobal.
- Use the $_SERVER superglobal.
- Use the $_GLOBALS superglobal.
The correct option is 1. To store information about a user session in PHP, you would use the $_SESSION superglobal. The $_SESSION superglobal is an associative array that allows you to store and access session variables. It is used to maintain session data across multiple page requests for a specific user. By storing data in $_SESSION, you can preserve user-specific information throughout their interaction with your web application. The session data is stored on the server and can be accessed across different pages or scripts as long as the session is active. Learn more: https://www.php.net/manual/en/reserved.variables.session.php
In PHP, the fopen() function with 'w' as the mode will create a file if it doesn't exist and open it for ______.
- reading
- writing
- appending
- deleting
In PHP, using the 'w' mode with the fopen() function allows you to create a file if it doesn't exist and open it for writing. This mode truncates the file if it already exists, so caution should be exercised.
What is the break statement used for in PHP?
- Terminating the execution of a loop or switch statement
- Skipping the current iteration of a loop
- Returning a value from a function
- Displaying an error message
The correct option is: "Terminating the execution of a loop or switch statement." In PHP, the break statement is used to exit the current loop or switch statement. It is commonly used when a certain condition is met, and you want to stop the execution of the loop or switch immediately. Learn more: https://www.php.net/manual/en/control-structures.break.php
How do you use Regular Expressions in PHP?
- By using the preg_match() function to match a pattern against a string.
- By using the rand() function to generate random numbers.
- By using the str_replace() function to replace occurrences of a substring in a string.
- By using the sizeof() function to determine the size of an array.
In PHP, you can use regular expressions by using the preg_match() function to match a pattern against a string. The preg_match() function takes two parameters: the pattern to match and the string to search. It returns true if the pattern is found in the string and false otherwise. Regular expressions are defined using special characters and modifiers that specify the pattern to search for. The preg_match() function allows you to perform various operations based on the matched pattern, such as extracting data or validating input. Learn more: https://www.php.net/manual/en/book.regex.php
Which of the following are ways to open a file in PHP?
- open() and read()
- fopen() and fread()
- include() and require()
- file_open()
The correct way to open a file in PHP is by using the fopen() function. It takes the path to the file and the mode as parameters. This function returns a file handle or pointer that can be used for file operations. The other options mentioned are not valid for opening files in PHP.
You need to use inheritance in your PHP script. How would you do this?
- By using the extends keyword
- By using the implement keyword
- By using the inherit keyword
- By using the derive keyword
In PHP, to use inheritance in your script, you would use the extends keyword followed by the name of the parent class. The correct option is "By using the extends keyword." By extending a class, you create a subclass that inherits properties and methods from the parent class. For further details, refer to the PHP documentation on class inheritance: http://php.net/manual/en/language.oop5.inheritance.php
In PHP, the foreach loop can only access the values of an array, not the keys.
- Index
- Element
- Key
- Value
In PHP, the foreach loop allows you to access both the keys and values of an array. During each iteration, you can use the "key" variable to access the key/index of the current element, and the "value" variable to access the value of the element. This allows you to work with both the keys and values simultaneously. The foreach loop provides a convenient way to iterate over arrays and perform operations on each element. Learn more: https://www.php.net/manual/en/control-structures.foreach.php