In PHP, the ________ function can be used to count the number of elements in an array, which can be useful when processing multiple form fields.
- array_count()
- count_array()
- elements_count()
- count()
In PHP, the 'count()' function is used to count the number of elements in an array, making it useful when processing multiple form fields as it helps you determine the array's size.
The ________ function in PHP returns an array of strings, each of which is a substring of the original string formed by splitting it on boundaries formed by a specified delimiter.
- explode()
- split()
- slice()
- splitString()
The 'explode()' function in PHP is used to split a string into an array of substrings using a specified delimiter. This is commonly used for parsing data.
What is the primary advantage of using PDO over traditional MySQL functions in PHP?
- Prepared Statements
- Easier Syntax
- Improved Speed and Efficiency
- Direct Access to MySQL
The primary advantage of using PDO over traditional MySQL functions in PHP is the improved speed and efficiency. PDO is designed to be more efficient and faster in handling database connections and queries. It also offers features like prepared statements that enhance security.
To ensure that PHP scripts don't have syntax errors, you can use the ________ command-line option.
- -l (or --syntax-check)
- -s (or --strict-errors)
- -e (or --error-check)
- -p (or --parse-error)
The -l (or --syntax-check) option checks PHP scripts for syntax errors without executing them, aiding in early error detection.
How can you prevent SQL injection attacks when using PDO in PHP?
- Using Prepared Statements and Parameter Binding
- Encoding User Inputs
- Filtering Input Data
- Adding Comments to SQL Queries
Preventing SQL injection with PDO is primarily achieved by using prepared statements and parameter binding. This approach separates user input from SQL, making it impossible for malicious SQL to be executed.
When handling multiple form fields, which HTML attribute allows users to select multiple values in an input field?
- size
- multiple
- array
- selected
The multiple attribute in an HTML
You are implementing a feature where users can upload multiple documents at once. What changes would you make in the HTML form to handle multiple file inputs?
- Use the multiple attribute
- Create multiple file input fields
- Use JavaScript to clone the input field
- Use AJAX for file uploads
To allow users to upload multiple documents at once, you should use the multiple attribute on a single file input field. This enables users to select multiple files in a single input.
Which PHP function can be used to convert a string to lowercase?
- strtolower()
- toLowerCase()
- strLower()
- convertToLower()
To convert a string to lowercase in PHP, you use the strtolower() function. It's a built-in function that does this conversion.
When connecting to a MySQL database using PDO, the DSN (Data Source Name) starts with the string ________.
- "dsn:"
- "pdo:"
- "mysql:"
- "database:"
When connecting to a MySQL database using PDO, the DSN typically starts with "mysql:" to specify the database type for the connection.
You are building a profile page where users can upload their profile pictures. Which PHP function would you use to ensure the uploaded file is an image type?
- getimagesize()
- is_uploaded_file()
- file_get_contents()
- move_uploaded_file()
The getimagesize() function is used to determine the type of an uploaded file and ensure it's an image type, based on the returned image type information.
In order to prevent other scripts on the server from accessing session files, PHP by default uses a ________ mechanism.
- session.save_handler
- session.file_permission
- session.use_strict_mode
- session.save_path
PHP uses a 'session.save_handler' mechanism to control where session data is stored, protecting it from unauthorized access.
In PHP, how can you check if a defined constant exists?
- defined()
- exists()
- constant_exists()
- is_constant_defined()
You can use the defined() function in PHP to check if a defined constant exists. It returns true if the constant is defined and false if it's not.