intermediate web programming

PHP

A widely used, open-source scripting language suited for web development that is executed on the server.

PHP Interpreter

A special program that automatically creates parts of HTML from PHP insertions within the HTML code.

Server-Side Development

The execution of scripts on a web server (like Apache or IIS) where the HTTP server calls the PHP process to execute a request and return output.

Static Web Page

A web page with fixed content that displays the same information to every user.

Dynamic Web Page

A web page whose content is generated or updated dynamically on the server side before being sent to the client.

PHP Scripting Block

A sequence of PHP statements enclosed between an opening tag ().

echo

A PHP statement used to output one or more strings; can be used with or without parentheses.

print

A PHP statement used to output a string and returns 1; can be used with or without parentheses.

PHP Tag

A set of opening () markers that define a block of PHP code.

PHP Comment

Lines in a PHP script that are ignored by the engine, used for documentation, notes, or debugging.

Single-line Comment

A comment marked by // or

that lasts until the end of the line.

Multiple-line Comment

A comment block enclosed between /* and */ that spans multiple lines.

Case Sensitivity in PHP

The behavior where PHP variables are case-sensitive, while keywords, function names, class names, and control structures are not case-sensitive.

Variable

A named part of a computer's memory used to store a value, represented in PHP by a dollar sign ($) followed by the variable name.

Uninitialized Variable

A variable that has not been assigned a value; defaults to false (booleans), zero (integers/floats), empty string (strings), or empty array (arrays).

Boolean

A basic data type in PHP that expresses a truth value, which can be either true or false (case-insensitive).

Integer

A non-decimal whole number between -2,147,483,648 and 2,147,483,647.

Floating-point Number (Float)

A data type representing a number with a decimal point or a number in exponential form.

String

A data type representing a series of characters enclosed within single or double quotes.

Constant

An identifier for a simple value that cannot change during script execution, defined using the define() function and uppercase by convention.

Function

A reusable block of statements in a program that executes when called.

Function Arguments

Variables passed into a function inside parentheses, used to pass information into the function body.