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Which of the following are true about the echo statement in PHP?

  • Echo does not have a return value.
  • Echo can output multiple parameters at once.
  • Echo is slightly faster and more efficient than print.
  • All of the above
All of the given options are true about the echo statement in PHP. Echo does not have a return value; it simply outputs the specified string(s). Echo can output multiple parameters at once, allowing you to concatenate multiple strings or variables together. Echo is slightly faster and more efficient than print, as it does not have a return value to handle. Learn more: https://www.php.net/manual/en/function.echo.php
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echo and print are functions in PHP.

  • TRUE
  • FALSE
This statement is false. Although echo and print are used as language constructs in PHP, they are not functions. They are language constructs provided by PHP for outputting content. The main difference is that echo has no return value, while print returns a value of 1. Both echo and print are used without parentheses and are not considered functions. Learn more: https://www.php.net/manual/en/function.echo.php https://www.php.net/manual/en/function.print.php
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To concatenate two strings in PHP, you use the ______ operator.

  • +
  • -
  • *
  • .
To concatenate two strings in PHP, you use the dot (.) operator. The dot operator is specifically used for string concatenation. It allows you to combine multiple strings into a single string. When the dot operator is used between two string values, it joins them together to form a concatenated string. Learn more: https://www.php.net/manual/en/language.operators.string.php
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What is a common use case for Regular Expressions in PHP?

  • Validating user input, such as email addresses or phone numbers.
  • Sorting an array of strings in alphabetical order.
  • Converting a string to uppercase letters.
  • Counting the number of occurrences of a specific character in a string.
A common use case for regular expressions in PHP is validating user input, such as email addresses or phone numbers. Regular expressions provide a powerful and flexible way to define patterns for validating and ensuring the correctness of user-provided data. By using regular expressions, you can check if an input matches a specific pattern, such as the format of an email address or a phone number. This helps in maintaining data integrity and preventing incorrect or malicious inputs. Learn more: https://www.php.net/manual/en/book.regex.php
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To make a single-line comment in PHP, you can use ______ or ______ at the beginning of the line.

  • // or #
  • /* or */
  • All of the above
Single-line comments in PHP can be written using either double slashes (//) or a hash symbol (#) at the beginning of the line. The other options are not used for single-line comments. In PHP, everything after // or # on a line is considered a comment and is ignored by the PHP interpreter. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php
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In PHP forms, you can make a field required by using the required attribute in the HTML.

  • TRUE
  • FALSE
The statement is true. In PHP forms, you can make a field required by using the required attribute in the HTML. The required attribute is an HTML attribute introduced in HTML5 that can be added to form fields. When this attribute is included, the browser ensures that the field must be filled out by the user before the form can be submitted. The required attribute provides a client-side validation mechanism to enforce the field's requirement. While PHP can also perform server-side validation, the required attribute is an additional layer of validation provided by the HTML form itself. Learn more: https://www.w3schools.com/tags/att_input_required.asp
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A common practice in PHP forms is to validate user inputs such as email and URL to prevent ______.

  • SQL injection attacks
  • Cross-Site Scripting (XSS) attacks
  • Cross-Site Request Forgery (CSRF) attacks
  • Code injection attacks
A common practice in PHP forms is to validate user inputs such as email and URL to prevent Cross-Site Scripting (XSS) attacks. By validating user inputs, you can ensure that any malicious script or code is not executed when displaying the user's input on the webpage. This helps to protect the application and its users from potential security vulnerabilities. For more details on web security in PHP, check: php.net/manual/en/security.php
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In PHP, $_POST is a superglobal array that is used to collect form data after submitting an HTML form with ______ as the method.

  • GET
  • POST
  • PUT
  • DELETE
In PHP, $_POST is a superglobal array that is used to collect form data after submitting an HTML form with POST as the method. The POST method sends form data in the body of the HTTP request, making it suitable for handling sensitive information or large amounts of data. When the form is submitted, the data is accessible through the $_POST superglobal. Learn more: https://www.php.net/manual/en/reserved.variables.post.php
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What are the differences between an abstract class and a regular class in PHP?

  • Instantiation: An abstract class cannot be instantiated directly, while a regular class can be instantiated.
  • Method Requirements: An abstract class can have abstract methods that must be implemented in subclasses, while a regular class can have only concrete methods.
  • Purpose: An abstract class serves as a blueprint for other classes, whereas a regular class can be used independently without inheritance.
  • Properties: An abstract class can contain properties that are not allowed in a regular class.
  • All the options
Abstract classes and regular classes in PHP have some notable differences. Abstract classes cannot be instantiated directly, whereas regular classes can be instantiated to create objects. Abstract classes are meant to be extended by other classes, while regular classes can be instantiated and used independently. Abstract classes may contain abstract methods without implementation, while regular classes typically have all their methods implemented. These distinctions define the nature and purpose of each type of class in PHP OOP. To know more, refer to: http://php.net/manual/en/language.oop5.abstract.php
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What is the purpose of the array_search() function in PHP?

  • To search for a value in an array
  • To sort the elements of an array
  • To filter the elements of an array
  • To count the number of elements in an array
The array_search() function in PHP is used to search for a specific value in an array and return the corresponding key if found. It performs a linear search through the array and returns the key of the first matching element or false if the value is not found. Learn more: http://php.net/manual/en/function.array-search.php
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How can you filter multiple inputs in PHP?

  • filter_var()
  • sanitize_input()
  • validate_input()
  • filter_input_array()
The filter_input_array() function in PHP is used to filter multiple inputs at once. It takes an input array and applies a specified filter to each element of the array. To learn more, refer to: http://php.net/manual/en/function.filter-input-array.php
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You've written a PHP script, but it's not executing correctly. You suspect there's a syntax error. How would you go about debugging this?

  • Run the script with a PHP interpreter and look for error messages.
  • Check the PHP error log file.
  • Use a PHP linter to check for syntax errors.
  • All of the above.
PHP offers several ways to debug scripts. Running the script with a PHP interpreter can reveal error messages that can help identify the problem. PHP also maintains an error log file that you can check for errors. Furthermore, using a PHP linter or a similar code checking tool can help identify syntax errors in your script. Learn more: https://www.php.net/manual/en/book.errorfunc.php
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