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The ______ function can be used in PHP to check the installed version of PHP.

  • version()
  • get_version()
  • php_version()
  • phpinfo()
The phpinfo() function can be used to check the installed version of PHP, among many other things. When this function is called, it displays a large amount of information about the current state of PHP, including details about PHP compilation options and extensions, the PHP version, server information and environment, etc. Learn more: https://www.php.net/manual/en/function.phpinfo.php
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You can call a user-defined function in PHP using a string variable that contains the function's name.

  • $function_name() or ${$function_name}()
  • $function_name;() or {$function_name;}()
  • $function_name[] or {$function_name}[]
  • $function_name{} or ${$function_name}{}
In PHP, you can call a user-defined function using a string variable that contains the function's name. The correct option is "$function_name() or ${$function_name}()" as it represents the valid syntax for calling a function with a string variable. By using the variable with parentheses () or curly brackets {}, you can invoke the function. The other mentioned options are not valid syntax for calling a function with a string variable in PHP. For further details, refer to the PHP documentation on variable functions: http://php.net/manual/en/functions.variable-functions.php
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To create a MySQL database using PHP, you first connect to the MySQL server, then execute a CREATE DATABASE query using the mysqli_query function like $result = mysqli_query($conn, ______).

  • "CREATE DATABASE database_name"
  • "CREATE TABLE table_name"
  • "INSERT INTO table_name"
  • "SELECT * FROM table_name"
To create a MySQL database using PHP, you would use the mysqli_query function to execute a CREATE DATABASE query. The SQL query would be "CREATE DATABASE database_name", where "database_name" is the name you want to give to your new database. The mysqli_query function takes two parameters: the connection object ($conn) and the SQL query. The function executes the query against the connected MySQL server and returns a result object. Make sure you have a successful connection established before executing the query.
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You have a foreach loop in your PHP script and you're encountering errors. The loop was supposed to operate on an array, but it may have been given a non-array variable. How would you debug this?

  • Use the "for" loop to iterate over the variable
  • Use the "if" statement to check if the variable is an array
  • Use the "while" loop to iterate over the variable
  • Use the "is_array()" function to check if the variable is an array
The correct option is: "Use the 'is_array()' function to check if the variable is an array." To debug the issue, you can use the 'is_array()' function to check if the variable is indeed an array before executing the foreach loop. If the variable is not an array, you can handle the error or provide a fallback mechanism. This helps ensure that the foreach loop operates on an array as intended. Learn more: https://www.php.net/manual/en/function.is-array.php
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You have a PHP script and you need to check if a variable is of a specified type. How would you do this?

  • gettype()
  • is_type()
  • checktype()
  • is_a()
To check if a variable is of a specified type in PHP, you can use the is_type() function. This function allows you to verify whether a variable belongs to a specific data type, such as string, integer, float, boolean, or array. It returns a boolean value indicating whether the variable matches the specified type. For further information, see: http://php.net/manual/en/function.is-string.php, http://php.net/manual/en/function.is-int.php, http://php.net/manual/en/function.is-float.php, http://php.net/manual/en/function.is-bool.php, http://php.net/manual/en/function.is-array.php
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The do...while loop in PHP will not execute its block of code if the condition is initially false.

  • TRUE
  • FALSE
  • nan
  • nan
The statement is incorrect. The do...while loop in PHP always executes its block of code at least once, regardless of the initial condition. After the first execution, the condition is checked. If the condition is true, the loop continues to execute. If the condition is false, the loop terminates. This behavior ensures that the code block is executed at least once. Learn more: https://www.php.net/manual/en/control-structures.do.while.php
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You have a PHP script and you need to get the list of all supported filters. How would you do this?

  • Use the filter_list() function
  • Use the get_supported_filters() function
  • Use the supported_filters() function
  • Use the list_filters() function
To get the list of all supported filters in PHP, you can use the filter_list() function. It returns an array containing the names of all available filters. For more information, consult the PHP documentation on filter_list(): http://php.net/manual/en/function.filter-list.php
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The rand() function in PHP returns a ______ integer.

  • Fixed
  • Positive
  • Negative
  • Random
The rand() function in PHP returns a random integer. It generates a pseudo-random number between the specified range or, if no range is given, between 0 and the maximum random value supported by the system. This function is useful when you need to generate random numbers for various purposes, such as generating random IDs or selecting random elements from an array. Learn more: https://www.php.net/manual/en/function.rand.php
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The main purpose of a destructor in a PHP class is to perform cleanup tasks before the object is destroyed.

  • tasks
  • initialization
  • validation
  • manipulation
The main purpose of a destructor in a PHP class is to perform cleanup tasks before the object is destroyed. The correct option is "tasks." The destructor is automatically called when an object is no longer referenced or explicitly destroyed, allowing you to release resources, close connections, or perform other necessary cleanup operations. For more information, consult the PHP documentation on destructors: https://www.php.net/manual/en/language.oop5.decon.php#language.oop5.decon.destruct
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In PHP, the three types of arrays are indexed, associative, and ______.

  • Sequential
  • Multidimensional
  • Consecutive
  • Nested
In PHP, the three types of arrays are indexed, associative, and multidimensional. Indexed arrays are accessed using numerical indices, starting from zero. Associative arrays use key-value pairs, where the keys are user-defined and used to access the corresponding values. Multidimensional arrays, also known as nested arrays, are arrays that contain other arrays as elements, allowing for the creation of complex data structures. Learn more: https://www.php.net/manual/en/language.types.array.php
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