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What happens if the condition in a PHP while loop is never false?

  • The loop will continue indefinitely
  • The loop will terminate after one iteration
  • The loop will not be executed at all
  • The loop will execute the code block only once
If the condition in a PHP while loop is never false, the loop will continue indefinitely, resulting in an infinite loop. The code block will be executed repeatedly as long as the condition remains true. It is important to ensure that the condition eventually becomes false to avoid infinite loops, as they can consume excessive resources and cause the program to become unresponsive. Infinite loops are generally unintended and can be caused by incorrect logic or a missing update in the loop control variable. It is essential to include logic within the loop to modify the condition or use control statements such as break or exit to terminate the loop when necessary. Learn more: https://www.php.net/manual/en/control-structures.while.php
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In PHP, $_REQUEST is a superglobal array that contains the contents of $_GET, $_POST, and $_COOKIE. It is commonly used to collect the ______ data after submitting an HTML form.

  • Form
  • Session
  • Server
  • Cookie
In PHP, the $_REQUEST superglobal array contains the combined data from $_GET, $_POST, and $_COOKIE. It is often used to collect the form data after submitting an HTML form. When a form is submitted, the data is sent either via the URL (GET method) or as part of the request body (POST method). The $_REQUEST superglobal provides a unified way to access the form data regardless of the submission method. By using $_REQUEST, you can collect the form data for further processing or validation. Learn more: https://www.php.net/manual/en/reserved.variables.request.php
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What are some common operations you might perform on a MySQL database using PHP?

  • Inserting data into tables
  • Updating existing data
  • Retrieving data from tables
  • All of the above
When working with a MySQL database using PHP, you can perform various common operations such as inserting data into tables, updating existing data, and retrieving data from tables using SELECT queries. Additionally, you can delete data from tables, create or alter database tables or schemas, and execute other administrative tasks. These operations allow you to interact with the database, store and retrieve information, and manipulate data as needed.
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You have multiple conditions in your PHP script and you want to test each one in order. How would you do this using if, elseif, and else statements?

  • if ($condition) { ... } elseif ($condition2) { ... } else { ... }
  • if ($condition) { ... } elseif ($condition2) { ... } endif;
  • if ($condition) { ... } else { ... }
  • if ($condition) { ... } elseif ($condition2) { ... } endif;
To test multiple conditions in order in PHP, you would use a combination of if, elseif, and else statements. The if statement is used to check the first condition. If the condition is true, the code block associated with the if statement will be executed. If the condition is false, the elseif statement is evaluated to check the next condition. This process continues until a condition is true, at which point the corresponding code block is executed. If none of the conditions are true, the else statement provides an alternative code block to be executed. Learn more: https://www.php.net/manual/en/control-structures.elseif.php
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How can we check if the value of a given variable is a number?

  • You can check if the value of a given variable is a number using the is_numeric() function in PHP.
  • You can check if the value of a given variable is a number using the is_int() function in PHP.
  • You can check if the value of a given variable is a number using the is_string() function in PHP.
  • You can check if the value of a given variable is a number using the is_float() function in PHP.
To check if the value of a given variable is a number in PHP, you can use the is_numeric() function. The is_numeric() function returns true if the value is numeric or a numeric string, and false otherwise. It can be used to validate user input or check the type of a variable. For example, you can use is_numeric($var) to check if the value of $var is a number. It's important to note that is_numeric() considers both integer and float values as numbers. If you specifically want to check if the value is an integer, you can use the is_int() function. Similarly, if you want to check if the value is a float, you can use the is_float() function.
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How do you handle exceptions in PHP? Explain the try-catch-finally block.

  • You can handle exceptions in PHP using the try-catch-finally block. The try block contains the code that may throw an exception. The catch block catches the thrown exception and allows you to handle it. The finally block contains code that will be executed regardless of whether an exception is thrown or caught.
  • Exceptions in PHP can only be handled using the try-catch block. The try block contains the code that may throw an exception. The catch block catches the exception and allows you to handle it. The finally block is optional and contains code that will be executed after the try and catch blocks, regardless of whether an exception was thrown or caught.
  • You can handle exceptions in PHP using the try-catch-finally block. The try block contains the code that may throw an exception. The catch block catches the thrown exception and allows you to ignore it. The finally block contains code that will be executed only if an exception is thrown.
  • You cannot handle exceptions in PHP; they will always result in a fatal error.
In PHP, exceptions provide a way to handle runtime errors or exceptional situations gracefully. The try-catch-finally block allows you to handle exceptions by specifying the code that may throw an exception within the try block. If an exception is thrown, it can be caught and handled in the catch block. The finally block is optional and allows you to specify code that will be executed regardless of whether an exception was thrown or caught. This is useful for performing cleanup tasks. For more information, you can refer to the PHP documentation: http://php.net/manual/en/language.exceptions.php
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How do you define a static method in PHP?

  • Use the static keyword before the method name
  • Use the public keyword before the method name
  • Use the function keyword before the method name
  • Use the static keyword within the method body
To define a static method in PHP, you would use the static keyword before the method name. This keyword indicates that the method belongs to the class itself rather than an instance of the class. Static methods can be accessed using the class name without creating an object of the class.
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You have a PHP script and you need to modify a global variable from within a function. How would you do this using the $GLOBALS superglobal?

  • Use the 'global' keyword followed by the variable name to declare it as global within the function and then modify its value.
  • Assign a new value directly to the variable using the $GLOBALS array and the variable name as the key.
  • Use the 'static' keyword followed by the variable name to declare it as static within the function and then modify its value.
  • Use the 'return' statement to return the modified value to the calling code, which can then update the global variable.
To modify a global variable from within a function using the $GLOBALS superglobal, you can use the 'global' keyword followed by the variable name to declare it as global within the function. After declaring it as global, you can modify its value directly within the function. This way, the changes will be reflected in the global scope. Learn more: https://www.php.net/manual/en/reserved.variables.globals.php
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When do sessions end?

  • When the browser is closed
  • After a specified time period
  • When the server is restarted
  • All of the above
Sessions can end when the browser is closed, after a specified time period of inactivity, or when the server is restarted, depending on the session configuration. Learn more: http://php.net/manual/en/session.configuration.php
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The default keyword in a PHP switch statement specifies the code to execute if there is no matching case.

  • Matching Case
  • Valid Case
  • Condition
  • Break
The default keyword in a PHP switch statement specifies the code to execute if there is no matching case. It serves as the default option when none of the case conditions evaluate to true. The default case is optional and is placed at the end of the switch statement. If no case matches the expression, the code block following the default case is executed. The default case allows you to define a fallback action or a default behavior when none of the specific cases are met. Learn more: https://www.php.net/manual/en/control-structures.switch.php
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