PHP Basic Knowledge Quiz

The correct answer is "echo 'Hello World';". In PHP, the "echo" statement is used to output text or variables. In this case, it is used to output the string "Hello World" to the screen. The other options, "Document.Write('Hello World');" and ""Hello World";" are not valid syntax in PHP.

In PHP, all variables start with the symbol $. This symbol is used to declare and access variables in PHP. It is followed by the variable name, which can contain letters, numbers, and underscores. The $ symbol is essential for distinguishing variables from other types of data in PHP code.

When a form is submitted using the "get" method, the information entered in the form is appended to the URL as query parameters. In PHP, the $_GET[] superglobal is used to retrieve these values from the URL. It allows you to access the submitted data by specifying the name of the input field as the key inside the square brackets. This method is commonly used when you want to retrieve and display the form data in the URL itself, such as in search forms. The other options, Request.QueryString and Request.Form, are not valid in PHP and are typically used in other programming languages like ASP.NET.

The correct way to end a PHP statement is with a semicolon (;). This is a common practice in many programming languages, including PHP, to indicate the end of a statement. The semicolon is used to separate multiple statements on the same line or to terminate a single statement on its own line. It helps to ensure that the code is properly interpreted and executed by the PHP interpreter.

In PHP, both single quotes and double quotes can be used for defining strings. This allows flexibility in choosing the type of quotes based on the specific requirements of the string. Single quotes are generally preferred when there is no need for variable interpolation or special character interpretation. Double quotes, on the other hand, allow for variable interpolation and special character interpretation. Therefore, the statement "In PHP you can use both single quotes ( ' ' ) and double quotes ( " " ) for strings" is true.

PHP stands for "PHP: Hypertext Preprocessor." PHP is a widely-used open-source scripting language that is specifically designed for web development. It is used to create dynamic web pages and can be embedded into HTML code. The name "PHP: Hypertext Preprocessor" is a recursive acronym, which means that one of the letters stands for itself. In this case, the "P" in PHP stands for PHP itself.

When using the POST method, variables are not displayed in the URL. The POST method is used to send data to the server in the body of the HTTP request, rather than appending it to the URL. This makes it more secure and suitable for sending sensitive information like passwords or credit card details.

To make an array of values, the correct syntax is "$arr = array('value1', 'value2');". This syntax creates an array called "$arr" and assigns it the values "value1" and "value2". The other options provided are incorrect. "$arr[] = new Array('value1', 'value2');" attempts to create a new array using the "new" keyword, but the correct syntax does not require the use of "new" or "Array". "$arr = new ['value1', 'value2'];" is also incorrect because it uses square brackets instead of the "array()" function.

PHP supports single-line and multi-line comments. Single-line comments start with // or # and continue until the end of the line. Multi-line comments begin with /* and end with */, allowing for comments that span multiple lines. These comments are ignored by the PHP interpreter, providing a way to document code or temporarily disable code blocks.

The statement "print count("123");" prints out the number 1. This is because the count() function is used to count the number of occurrences of a substring within a string. In this case, the substring "123" appears only once in the string, so the count() function returns 1, which is then printed out.