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What does the array operator '===' mean?

  • Identity comparison
  • Value comparison
  • Index assignment
  • Array concatenation
The '===' operator in PHP is the identity comparison operator. It compares both the value and the type of the operands. It returns true if the operands are identical, and false otherwise. Learn more: http://php.net/manual/en/language.operators.comparison.php
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What are some commonly used mail functions available in PHP?

  • mail(), smtp_mail(), imap_mail()
  • sendmail(), pop3_mail(), mailparse()
  • fopen(), fclose(), fgets()
  • mysqli_query(), pdo_query(), execute_query()
Some commonly used mail functions available in PHP include mail(), smtp_mail(), and imap_mail(). The mail() function is a built-in PHP function that sends email using the local mail transfer agent (MTA). The smtp_mail() function allows sending email using an SMTP server, providing more flexibility and control. The imap_mail() function is used for sending email through an IMAP server. These functions provide different options for sending emails in PHP, depending on the requirements of your application.
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How is it possible to set an infinite execution time for a PHP script?

  • Set the max_execution_time directive in the php.ini file to 0
  • Use the set_time_limit(0) function at the beginning of the PHP script
  • There is no way to set an infinite execution time for a PHP script
  • Use the unlimited_execution_time() function at the beginning of the PHP script
To set an infinite execution time for a PHP script, you can use the set_time_limit(0) function at the beginning of the PHP script. This function sets the maximum execution time for the script to 0, effectively removing any time limit. Additionally, you can also modify the max_execution_time directive in the php.ini file and set it to 0. It's important to note that setting an infinite execution time may have implications on server resources and may not be recommended for all scripts. It's advisable to use this with caution and only when necessary.
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A variable declared outside all functions in PHP has a global scope and can be accessed anywhere in the script.

  • TRUE
  • FALSE
Yes, the statement is true. A variable declared outside all functions in PHP has a global scope. It means the variable is accessible from anywhere within the script, including inside functions. These global variables retain their values throughout the execution of the script. However, it is generally recommended to use global variables sparingly and follow good programming practices to avoid potential issues related to variable scoping and maintainability. Learn more: https://www.php.net/manual/en/language.variables.scope.php#language.variables.scope.global
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What function do you use in PHP to start output buffering?

  • ob_start()
  • ob_flush()
  • ob_get_contents()
  • All of the above
In PHP, you can start output buffering using the ob_start() function. This function enables output buffering, capturing the output generated by PHP scripts and storing it in an internal buffer instead of immediately sending it to the client's browser. This provides the ability to manipulate the output, modify headers, and perform other operations before sending the final output to the browser. Using ob_start() is particularly useful when you need to conditionally modify or discard the output based on certain conditions or when you want to capture the output for further processing.
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What is the purpose of the is_numeric() function in PHP?

  • To check if a value is numeric
  • To check if a string is alphanumeric
  • To check if a value is a string
  • To check if a value is an integer
The is_numeric() function in PHP is used to check if a value is numeric. It returns true if the value is a number or a numeric string and false otherwise. This function is useful for validating user input or performing numeric operations on values. Learn more: http://php.net/manual/en/function.is-numeric.php
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How do you insert data into a MySQL table using PHP?

  • Use the mysqli_query() function to execute an INSERT INTO query
  • Use the mysqli_insert() function to insert data into a table
  • Use the pdo_query() function to execute an INSERT INTO query
  • Use the execute_query() function to insert data into a table
To insert data into a MySQL table using PHP, you would use the mysqli_query function to execute an INSERT INTO query. The INSERT INTO query specifies the table name and the values to be inserted. The mysqli_query function takes two parameters: the connection object ($conn) and the SQL query. The function executes the query against the connected MySQL database. Make sure you have a successful connection established and the desired database selected before executing the query.
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You are writing a PHP script and you need to access 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.
  • Access the variable directly using the $GLOBALS array and the variable name as the key.
  • Assign the variable to a local variable inside the function and use it within the function.
  • Create a new instance of the variable within the function and assign it the value of the global variable.
To access a global variable within a function using the $GLOBALS superglobal, you can use the $GLOBALS array and the variable name as the key. The $GLOBALS array is a superglobal that contains all global variables in the global scope. By accessing the variable directly using $GLOBALS['variable_name'], you can retrieve its value within the function. Learn more: https://www.php.net/manual/en/reserved.variables.globals.php
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In PHP, a multidimensional array can only contain indexed arrays.

  • TRUE
  • FALSE
False. In PHP, a multidimensional array can contain both indexed arrays and associative arrays as its elements. While indexed arrays are commonly used in multidimensional arrays, associative arrays can also be used to create multidimensional structures. This flexibility allows for the representation of complex data relationships, where values can be accessed using either numeric indices or string keys. Multidimensional arrays in PHP provide a versatile way to organize and manipulate data in a structured manner. Learn more: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax
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The function_exists() function in PHP is used to check if a function has been defined.

  • Function
  • Variable
  • Class
  • Constant
The function_exists() function in PHP is used to check if a function has been defined. By passing the function name as a string parameter, the function checks if the function exists and is callable, returning true if it does. The other mentioned options (Variable, Class, Constant) are not specifically used with the function_exists() function. For more details, refer to the PHP documentation on function_exists(): http://php.net/manual/en/function.function-exists.php
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