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How is it possible to know the number of rows returned in the result set?

  • You can use the mysqli_num_rows() function to retrieve the number of rows returned by a MySQL query.
  • You can use the mysql_count_rows() function to retrieve the number of rows returned by a MySQL query.
  • You can use the mysql_num_rows() function to retrieve the number of rows returned by a MySQL query.
  • You can use the mysql_get_rows() function to retrieve the number of rows returned by a MySQL query.
To know the number of rows returned in the result set of a MySQL query, you can use the mysqli_num_rows() function in PHP. This function returns the number of rows in the result set as an integer. It is commonly used after executing a SELECT query to determine the number of rows returned by the query. For example, you can use mysqli_num_rows($result) to get the number of rows returned by a query stored in the $result variable. It's important to note that this function works with the MySQLi extension in PHP. If you are using the deprecated MySQL extension or the PDO extension, you need to use the respective functions provided by those extensions to retrieve the number of rows.
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Which of the following PHP data types can hold multiple values?

  • int
  • boolean
  • array
  • None of the above
The array data type in PHP can hold multiple values. Arrays are used to store collections of values, and they can hold elements of different data types. An array allows you to organize and access multiple values using keys or indexes. Learn more: https://www.php.net/manual/en/language.types.array.php
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The filter_var_array() function in PHP allows you to filter ______ inputs at once.

  • single
  • multiple
  • individual
  • specific
The filter_var_array() function in PHP allows you to filter multiple inputs at once. It takes an input array and applies a specified filter to each element of the array. For further information, visit: http://php.net/manual/en/function.filter-var-array.php
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What are some steps you might take when creating a MySQL table using PHP?

  • Connect to the MySQL server, select the database, execute a CREATE TABLE query, handle errors, close the connection
  • Connect to the MySQL server, execute a SELECT query, handle errors, close the connection
  • Connect to the MySQL server, execute an INSERT INTO query, handle errors, close the connection
  • Connect to the MySQL server, execute a DELETE query, handle errors, close the connection
When creating a MySQL table using PHP, you would typically follow these steps: 1. Connect to the MySQL server using the appropriate credentials. 2. Select the database where you want to create the table. 3. Execute a CREATE TABLE query using the mysqli_query function. 4. Check the return value of the mysqli_query function to handle any errors that may have occurred during the query execution. 5. Close the connection to the MySQL server using the mysqli_close function. These steps ensure that you establish a connection, create the table, handle any errors, and properly close the connection when you're done.
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You are writing a PHP script and you need to collect data sent in the URL's query string. How would you do this using the $_GET superglobal?

  • Access the data using the $_GET['key'] syntax.
  • Access the data using the $_GET->$key syntax.
  • Access the data using the $_GET['key'] method.
  • Access the data using the $_GET->key method.
To collect data sent in the URL's query string in PHP using the $_GET superglobal, you can access the data using the $_GET['key'] syntax, where 'key' represents the name of the parameter in the query string. For example, if the URL is "example.com/page.php?id=123", you can access the value "123" by using $_GET['id']. This allows you to retrieve and process the data passed through the URL using the GET method. Learn more: https://www.php.net/manual/en/reserved.variables.get.php
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The === operator in PHP checks if the values of two operands are ______ and of the ______ type.

  • Equal and same
  • Equal and different
  • Not equal
  • Not equal and same
The === operator in PHP checks if the values of two operands are equal and of the same type. It performs a strict comparison, meaning that it not only checks for equality but also ensures that the data types of the values are the same. For example, $num1 === $num2 will return true if $num1 is equal to $num2 and both have the same data type, and false otherwise. Learn more: https://www.php.net/manual/en/language.operators.comparison.php
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The ______ keyword is used in PHP to make a local variable accessible globally.

  • local
  • global
  • this
  • super
The global keyword in PHP is used to make a local variable accessible globally. By using the global keyword followed by the variable name within a function, you can access and modify the value of the variable globally, outside the function's local scope. This allows you to work with local variables in a wider scope. However, it is generally recommended to minimize the use of global variables for better code organization and maintainability. Learn more: https://www.php.net/manual/en/language.variables.scope.php#language.variables.scope.global
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You can create an object in PHP by using the new keyword followed by the class name like $object = new ______.

  • ClassName
  • ObjectName
  • NewObject
  • CreateObject
In PHP, you can create an object by using the new keyword followed by the class name and parentheses. The correct option is "ClassName." This syntax instantiates an object of the specified class. For more information, consult the PHP documentation on creating objects: http://php.net/manual/en/language.oop5.php
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You have a variable in your PHP script that needs to hold a simple true or false value. What data type would you use?

  • int
  • float
  • string
  • boolean
To hold a simple true or false value in PHP, you would use the boolean data type. The boolean data type is specifically designed to store either true or false values. It is commonly used in conditions, logical operations, or to indicate the success or failure of an operation. By using the boolean data type, you can ensure that the variable only holds the expected true or false values, providing clarity and correctness to your code. Learn more: https://www.php.net/manual/en/language.types.boolean.php
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Once a constant is set in PHP, it cannot be ______ or ______.

  • Modified or redefined
  • Accessed or printed
  • Declared or assigned
  • Deleted or removed
Once a constant is set in PHP, it cannot be modified or redefined during the script execution. Constants are intended to store fixed values that remain constant throughout the execution of the script. Once defined, their value cannot be changed. Any attempt to modify or redefine a constant will result in an error. This behavior ensures that constants maintain their fixed value and avoid accidental changes. Learn more: https://www.php.net/manual/en/language.constants.php
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