The filter_var() function in PHP is used to ______ and validate data.
- filter
- sanitize
- validate
- clean
The filter_var() function in PHP is used to filter and validate data. It provides a wide range of filters to sanitize and validate various types of data, such as URLs, email addresses, numbers, and more. By applying appropriate filters, the filter_var() function helps ensure data integrity and security. Refer to: http://php.net/manual/en/function.filter-var.php
In PHP, a variable name must start with a ______ followed by the name of the variable.
- Dollar sign ($)
- Letter (a-z)
- Underscore (_)
- Number (0-9)
In PHP, variable names must start with a dollar sign ($), followed by the name of the variable. The variable name is case-sensitive. Variable names follow certain rules: they must begin with a letter or the underscore character; they can't begin with a number; they can contain alpha-numeric characters and underscores. Learn more: https://www.php.net/manual/en/language.variables.basics.php
Which of the following is used in PHP to declare a floating-point number?
- int
- float
- string
- boolean
In PHP, the float keyword is used to declare a floating-point number. Floats, also known as floating-point numbers or doubles, are used to represent real numbers with a decimal point. They can hold positive and negative values with varying degrees of precision. Learn more: https://www.php.net/manual/en/language.types.float.php
How does a PHP class implement an interface?
- implements
- extends
- uses
- inherits
In PHP, a class implements an interface using the implements keyword followed by the name of the interface or a comma-separated list of interface names. For example: class ClassName implements InterfaceName { } By implementing an interface, a class agrees to fulfill the contract defined by the interface. The class must provide an implementation for all the methods defined in the interface. A class can implement multiple interfaces by listing them after the implements keyword. This allows the class to define behavior and functionality according to multiple contracts. To know more about interface implementation, visit: http://php.net/manual/en/language.oop5.interfaces.php
In PHP, Form Handling involves collecting, processing, and responding to user data submitted through ______.
- HTML forms
- JavaScript functions
- CSS stylesheets
- PHP functions and techniques
In PHP, Form Handling involves collecting, processing, and responding to user data submitted through HTML forms. HTML forms provide a way for users to input and submit data, which is then sent to the server for processing. PHP provides various functions and techniques to handle the form data and perform actions such as validation, sanitization, storage, or further processing. The data submitted through HTML forms can be accessed in PHP using superglobal arrays like $_POST or $_GET, depending on the form's method attribute. Form Handling in PHP is a crucial aspect of building interactive websites and web applications. Learn more: https://www.php.net/manual/en/tutorial.forms.php
In PHP, the ______ statement can output one or more strings.
- echo
- printf
- display
In PHP, the echo statement can output one or more strings. It is commonly used to display strings and variables. You can use echo to output plain text, HTML code, or a combination of both. Multiple strings can be concatenated with the dot (.) operator within the echo statement. Learn more: https://www.php.net/manual/en/function.echo.php
What functions does PHP provide for sorting arrays?
- sort() and rsort()
- shuffle() and reverse()
- merge() and split()
- sum() and count()
PHP provides the sort() and rsort() functions for sorting arrays. The sort() function arranges the elements of an array in ascending order, while the rsort() function sorts the elements in descending order. These functions work directly on the array and modify its order. Sorting arrays is a common operation in PHP, and these functions provide a convenient way to organize and rearrange array elements based on their values. Learn more: https://www.php.net/manual/en/array.sorting.php
What are some commonly used network functions in PHP?
- file_get_contents(), curl_init(), fsockopen()
- mysqli_query(), pdo_query(), execute_query()
- json_encode(), json_decode(), json_last_error()
- All of the above
Some commonly used network functions in PHP include file_get_contents(), curl_init(), and fsockopen(). The file_get_contents() function is used to establish an HTTP connection and fetch the content of a web page. The curl_init() function provides more advanced features for handling HTTP requests, including support for various protocols and options. The fsockopen() function allows low-level socket programming for network communication. These functions enable PHP to interact with remote servers, retrieve data from APIs, perform HTTP requests, and handle network-related tasks.
What is the purpose of the require_once() function in PHP?
- To include and evaluate a file only once
- To include and evaluate a file multiple times
- To include and evaluate a file conditionally
- To include and evaluate a file dynamically
The require_once() function in PHP is used to include and evaluate a file in PHP. It ensures that the file is included only once, even if it is referenced multiple times in the code. This is useful for including essential files that should not be duplicated. Learn more: http://php.net/manual/en/function.require-once.php
How can you validate an email field in a PHP form?
- Using a regular expression
- Comparing the input to a list of known email addresses
- Checking if the input contains the @ symbol
- All of the above
To validate an email field in a PHP form, you can use a regular expression. Regular expressions provide a powerful and flexible way to match patterns in strings. By using a specific regular expression pattern, you can check if the input matches the structure of a valid email address. Learn more: https://www.php.net/manual/en/filter.examples.validation.php