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Which of the following are true about comments in PHP?

  • Comments are ignored by the PHP interpreter during script execution
  • Comments can be used to leave notes or explanations for other developers
  • Comments are sent to the client's browser along with the executed PHP code
  • Comments can be used to alter the logic of the PHP code
Comments in PHP are ignored by the PHP interpreter during script execution. They are purely for developers' benefit and are not sent to the client's browser. Comments can be used to leave notes or explanations for other developers. The last option is incorrect because comments do not alter the logic of the PHP code; they only provide additional information or instructions to the developers.
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Constants in PHP can be defined and accessed anywhere in the script without regard to ______ rules.

  • Scope
  • Variable
  • Function
  • Class
Constants in PHP can be defined and accessed anywhere in the script without regard to variable scope rules. Unlike variables, constants are not tied to a specific scope. Once defined, they are globally available throughout the script, including inside functions, classes, and different scopes. This behavior allows for easy and consistent access to constants without the need to pass them as function arguments or use global keywords. Learn more: https://www.php.net/manual/en/language.constants.php
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You are writing a PHP script and you need to define a trait. How would you do this?

  • Using the trait keyword followed by the trait name and its definition
  • Using the class keyword followed by the trait name and its definition
  • Using the trait keyword followed by the trait name and its implementation details
  • Using the interface keyword followed by the trait name and its implementation details
To define a trait in PHP, you would use the trait keyword followed by the trait name and its definition. Traits allow you to define reusable blocks of code that can be included in multiple classes.
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Which of the following are ways to handle cookies in PHP?

  • Using the setcookie() function
  • Accessing the $_COOKIE superglobal
  • Using the header() function
  • Storing cookies in a database
  • Using the setcookie() function or Accessing the $_COOKIE superglobal
In PHP, there are multiple ways to handle cookies. The setcookie() function is used to set cookies, while the $_COOKIE superglobal array allows access to the cookie information. The header() function can also be used to set cookies, although it's less common. Storing cookies in a database is not a built-in method in PHP but can be done as a custom implementation.
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Which cryptographic extension provides generation and verification of digital signatures?

  • The OpenSSL extension provides generation and verification of digital signatures in PHP.
  • The Mcrypt extension provides generation and verification of digital signatures in PHP.
  • The Hash extension provides generation and verification of digital signatures in PHP.
  • The Crypt extension provides generation and verification of digital signatures in PHP.
The OpenSSL extension provides generation and verification of digital signatures in PHP. It offers a wide range of cryptographic functions, including the ability to generate and verify digital signatures. Digital signatures are widely used for data integrity and authentication in secure communication. The OpenSSL extension provides functions such as openssl_sign() and openssl_verify() that allow you to generate and verify digital signatures using different algorithms, such as RSA or DSA. It's important to note that the Mcrypt extension is primarily used for encryption and decryption, and the Hash extension is used for hashing algorithms. The Crypt extension does not provide digital signature functionality.
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How do you use the $GLOBALS superglobal in PHP?

  • By accessing specific variables using their names as keys in the $GLOBALS array.
  • By assigning values directly to the $GLOBALS variable.
  • By calling the global() function followed by the variable name.
  • By declaring variables with the global keyword.
The correct option is 1. To use the $GLOBALS superglobal in PHP, you can access specific variables by using their names as keys in the $GLOBALS array. For example, to access a global variable named "myVariable", you would use $GLOBALS['myVariable']. This allows you to retrieve the value of the global variable or modify it directly through the $GLOBALS array. It provides a convenient way to access global variables from anywhere within the script without having to use the global keyword. However, it is generally recommended to use global variables sparingly and consider alternative approaches, such as passing variables as parameters or using dependency injection, to achieve better code maintainability and testability. Learn more: https://www.php.net/manual/en/reserved.variables.globals.php
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You have a PHP script and you need to access the session variables. How would you do this?

  • $_SESSION
  • $_REQUEST
  • $_SESSION_VARIABLES
  • $_GLOBAL
To access session variables in PHP, you can use the $_SESSION superglobal array. It allows you to store and retrieve data across multiple pages or requests within the same session. The values stored in $_SESSION are specific to each individual user session. For further information, visit: http://php.net/manual/en/reserved.variables.session.php
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You need to prevent form submission in your PHP script if a required field is left empty. How would you do this?

  • Use JavaScript to validate the form before submitting it
  • Check if the field is empty using the empty() function and display an error message if it is
  • Implement client-side validation using HTML5 required attribute
  • Use CSS to visually indicate the required fields and prompt the user to fill them
To prevent form submission in PHP when a required field is left empty, you can check if the field is empty using the empty() function. If the field is empty, you can display an error message to the user. This ensures that the form is not submitted until all required fields are filled. For further information on form validation in PHP, refer to: php.net/manual/en/tutorial.forms.php#tutorial.forms.validation
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In PHP, you can define a static method using the static keyword like public static function FunctionName() { ______ }.

  • // method implementation
  • return;
  • // your code here
  • // static method
In PHP, you can define a static method using the static keyword. The syntax for defining a static method is: public static function FunctionName() { // method implementation }. The static keyword is placed before the function name, indicating that it is a static method. You can then provide the implementation of the method inside the function body.
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When is the elseif statement used in PHP?

  • When you need to evaluate multiple conditions sequentially and execute the first block of code that meets the condition
  • When you need to repeat a block of code multiple times
  • When you need to define a function with multiple arguments
  • When you need to concatenate multiple strings
The elseif statement in PHP is used when you need to evaluate multiple conditions sequentially and execute the first block of code that meets the condition. It allows you to provide an alternative set of conditions to be checked after the initial if condition is false. If any of the elseif conditions are met, the corresponding code block will be executed, and the remaining elseif and else conditions will be skipped. This enables you to create a chain of conditional checks and execute different code blocks based on different conditions. Learn more: https://www.php.net/manual/en/control-structures.elseif.php
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