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Explain the concept of method chaining in PHP. How does it enhance code readability and simplify object-oriented programming?

  • Method chaining in PHP allows you to invoke multiple methods on an object in a single line by returning the object itself from each method call. This enhances code readability by making the code more concise and readable. It simplifies object-oriented programming by enabling a fluent interface where methods can be chained together, leading to more expressive and intuitive code.
  • Method chaining in PHP is a technique where you call multiple methods on an object using the arrow operator (->). It improves code readability by reducing the number of lines of code required. It simplifies object-oriented programming by providing a concise syntax for invoking multiple methods on an object.
  • Method chaining in PHP is a technique where you call methods on an object using the double colon (::) operator. It enhances code readability by reducing the number of lines of code required. It simplifies object-oriented programming by providing a way to invoke multiple methods in a single line.
  • Method chaining is not supported in PHP.
Method chaining in PHP allows you to invoke multiple methods on an object in a single line, improving code readability and simplifying object-oriented programming. By returning the object itself from each method call, you can chain subsequent method calls directly. This leads to more concise and expressive code, as it reduces the need for temporary variables or multiple lines of code. Method chaining is commonly used in libraries and frameworks to provide a fluent and intuitive interface for interacting with objects. For more information, you can refer to the PHP documentation: http://php.net/manual/en/language.oop5.magic.php
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What is the purpose of the file_get_contents() function in PHP?

  • To read the contents of a file into a string
  • To write data to a file
  • To rename a file
  • To delete a file
The file_get_contents() function in PHP is used to read the contents of a file and return them as a string. It takes the file name or URL as a parameter and returns the contents of the file. This function is commonly used to read files and retrieve their contents. Learn more: http://php.net/manual/en/function.file-get-contents.php
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You should use the move_uploaded_file() function in PHP to move the uploaded file to a desired directory.

  • TRUE
  • FALSE
  • nan
  • nan
In PHP, the move_uploaded_file() function is specifically designed to handle file uploads and move the uploaded file to a desired directory. It takes the temporary file path (provided in the $_FILES array) as the first argument and the desired destination path as the second argument. This function ensures proper handling of uploaded files, including security considerations and handling of file permissions and naming conflicts.
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You have a PHP script and you need to get the URL of the current page. How would you do this using the $_SERVER superglobal?

  • $_SERVER['REQUEST_URI']
  • $_SERVER['CURRENT_URL']
  • $_SERVER['PAGE_URL']
  • $_SERVER['SITE_URL']
To retrieve the URL of the current page using the $_SERVER superglobal in PHP, you can use $_SERVER['REQUEST_URI']. This key contains the path and query string of the requested URL. It provides the information needed to reconstruct the URL of the current page. By accessing the 'REQUEST_URI' key within the $_SERVER superglobal, you can obtain the URL of the current page. Learn more: https://www.php.net/manual/en/reserved.variables.server.php
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The ______ data type in PHP is used to store a number with a decimal point.

  • int
  • float
  • string
  • array
The float data type in PHP is used to store a number with a decimal point. Floats, also known as floating-point numbers or doubles, can represent real numbers and are used when precision is required in calculations involving decimal values. Floats can hold positive and negative values with varying degrees of precision. Learn more: https://www.php.net/manual/en/language.types.float.php
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You have a PHP script and you are getting an error when trying to send an email. How would you troubleshoot this issue using mail functions?

  • Check the error message returned by error_get_last() and review the mail function usage
  • Update the PHP version and mail extensions
  • Reinstall the mail server
  • All of the above
To troubleshoot an error when sending an email using mail functions in PHP, you can check the error message returned by the error_get_last() function. This function retrieves the last PHP error message. Reviewing this error message can provide insights into the issue that occurred during the email sending process. It may indicate configuration problems, missing mail extensions, or other errors related to the mail function usage. Additionally, you can consider updating the PHP version and mail extensions or reinstalling the mail server if the issue persists. By following these troubleshooting steps, you can identify and resolve the error encountered during email sending.
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In PHP, what is the term for the blueprint from which individual objects are created?

  • Class
  • Object
  • Instance
  • Prototype
In PHP, the term for the blueprint from which individual objects are created is "Class." A class defines the structure, properties, and methods that an object will have. Objects are instances of a class, and they are created based on the blueprint provided by the class. The other mentioned options (Object, Instance, Prototype) are related to objects but do not specifically refer to the blueprint itself. For further details, refer to the PHP documentation on classes and objects: http://php.net/manual/en/language.oop5.php
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How can you upload a file in PHP?

  • Using an HTML form with the enctype attribute set to "multipart/form-data" and an input element of type "file"
  • Using the upload() function in PHP
  • Using the file_get_contents() function to read the file contents and process them
  • Using the include() function to include the file in the PHP script
To upload a file in PHP, you need to use an HTML form with the enctype attribute set to "multipart/form-data" and an input element of type "file". This allows the browser to send the selected file to the server. On the server side, PHP handles the uploaded file data and provides access to it using the appropriate superglobal array.
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In a PHP switch statement, what does the case keyword represent?

  • A value to compare the expression against
  • The starting point of the switch statement
  • A condition to be evaluated
  • The default case
In a PHP switch statement, the case keyword represents a value to compare the expression against. Each case represents a specific value or condition that is evaluated against the switch expression. When a case matches the value of the expression, the corresponding block of code following that case is executed. The case keyword allows you to define multiple possible values or conditions to be compared within the switch statement. Learn more: https://www.php.net/manual/en/control-structures.switch.php
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You can decode a JSON object into a PHP array using the json_decode() ______.

  • method
  • function
  • property
  • class
In PHP, you can decode a JSON object into a PHP array using the json_decode() function. It is a standalone function, not a method, property, or class. The json_decode() function takes a JSON-encoded string and converts it into a PHP value, typically an array or an object. The correct option is "function." For more information, consult the PHP documentation on json_decode(): http://php.net/manual/en/function.json-decode.php
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