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Which of the following are common uses of associative arrays in PHP?

  • Storing configuration settings.
  • Representing database query results.
  • Organizing form input data.
  • All of the above.
The correct option is 4. Associative arrays in PHP have multiple common uses. They are frequently employed for storing configuration settings, representing database query results, and organizing form input data. Associative arrays provide a convenient way to map specific keys to their corresponding values, allowing for efficient retrieval and management of data. Their flexibility and versatility make them suitable for a wide range of applications in PHP programming. Learn more: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax
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Which of the following are true about the $_GET superglobal in PHP?

  • It is used to retrieve data sent via an HTML form using the GET method.
  • It is an associative array that stores form data submitted via the GET method.
  • It can be accessed using the $_POST superglobal.
  • It retrieves data from the URL's query string using the GET method.
The true statements about the $_GET superglobal in PHP are that it retrieves data from the URL's query string using the GET method and that it is an associative array. When data is sent to the server using the GET method, the values are appended to the URL as key-value pairs. The $_GET superglobal allows access to these values by using the corresponding key as an index. However, it is not used to retrieve data sent via an HTML form using the GET method or accessed using the $_POST superglobal. Learn more: https://www.php.net/manual/en/reserved.variables.get.php
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You have an array in your PHP script and you want to execute a block of code for each element in the array. Which type of loop would you use and why?

  • foreach loop
  • for loop
  • while loop
  • do-while loop
If you want to execute a block of code for each element in an array, you would use a foreach loop in PHP. The foreach loop specifically allows you to iterate over the elements of an array without explicitly managing the index or the length of the array. It simplifies the process of accessing each element of the array one by one. The foreach loop automatically traverses the entire array, executing the code block for each element. It provides a convenient and efficient way to work with arrays in PHP and is suitable for scenarios where you want to perform operations on each element of an array individually. Learn more: https://www.php.net/manual/en/control-structures.foreach.php
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How can you create a file in PHP?

  • create()
  • fopen()
  • write()
  • include()
In PHP, you can create a file by using the fopen() function with the appropriate file path and mode. If the file does not exist, it will be created. The mode should include the write (w) or append (a) flag to indicate the intention to write to the file.
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The else statement in PHP can only be used after an if statement.

  • TRUE
  • FALSE
  • nan
  • nan
The else statement in PHP can only be used after an if statement. It provides an alternative code block to be executed when the if condition is false. If there is no preceding if statement, there is no condition to evaluate, and the else statement does not have a context to be used. The else statement is designed to work in conjunction with an if statement to provide a different set of instructions when the initial condition is not met. Learn more: https://www.php.net/manual/en/control-structures.else.php
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Which of the following are ways to use callback functions in PHP?

  • Passing a function as an argument to another function
  • Assigning an anonymous function to a variable
  • Defining a function within another function
  • All of the above
In PHP, there are multiple ways to use callback functions. You can pass a function as an argument to another function, assign an anonymous function to a variable, or define a function within another function. All of the mentioned options are valid ways to use callback functions in PHP. Callback functions are widely used in event handling, sorting, filtering, and many other scenarios. For more details, refer to the PHP documentation on callback functions: http://php.net/manual/en/language.types.callable.php
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How is a multi-line comment denoted in PHP?

  • // Comment
  • /* Comment */
    • PHP offers various encryption algorithms, including AES, Blowfish, and RSA. AES (Advanced Encryption Standard) is a symmetric algorithm commonly used for encrypting sensitive data. Blowfish is another symmetric algorithm known for its flexibility and high security. RSA is an asymmetric algorithm used for secure communication and key exchange. The choice of encryption algorithm depends on factors such as security requirements, performance, and compatibility with other systems.
    • The only encryption algorithm available in PHP is MD5.
    • PHP does not support encryption algorithms.
    • PHP provides a single encryption algorithm called "crypt".
    PHP offers a range of encryption algorithms, including AES, Blowfish, and RSA. AES is a symmetric algorithm suitable for encrypting sensitive data. Blowfish is also a symmetric algorithm known for its flexibility and high security. RSA is an asymmetric algorithm used for secure communication and key exchange. The choice of encryption algorithm depends on factors such as security requirements, performance, and compatibility with other systems. It is important to select an algorithm that meets the specific needs of your application. For more information, you can refer to the PHP documentation: http://php.net/manual/en/function.openssl-encrypt.php, http://php.net/manual/en/function.mcrypt-encrypt.php, http://php.net/manual/en/function.sodium-crypto-secretbox.php
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You have a PHP script and you are getting an error when trying to create a MySQL table. How would you troubleshoot this issue?

  • Check the error message returned by mysqli_error and review the CREATE TABLE query for syntax or other issues
  • Update PHP version and MySQL extensions
  • Reinstall MySQL server
  • All of the above
To troubleshoot an error when creating a MySQL table in a PHP script, you would do the following: 1. Check the error message returned by mysqli_error to understand the cause of the error. It may indicate syntax errors or other issues with the CREATE TABLE query. 2. Review the CREATE TABLE query for any syntax errors or inconsistencies. Ensure that the query is correctly formatted and all necessary elements are included. 3. If the issue persists, consider updating the PHP version and MySQL extensions to ensure compatibility. 4. In extreme cases, reinstalling the MySQL server might help if there are server-related issues. By following these troubleshooting steps, you can identify and resolve the error encountered during table creation.
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How is a single-line comment denoted in PHP?