PHP/MySQL Tutorial: Introduction to Database

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Questions and Answers

What is the full form of PHP?

Hypertext Preprocessor

Where do PHP scripts reside within HTML pages?

Between reserved PHP tags

How are PHP scripts executed?

On the server-side

What kind of language is PHP?

Interpreted language Signup and view all the answers

What are the comment symbols used in PHP?

Standard C, C++, and shell comment symbols Signup and view all the answers

How do PHP variables begin?

With a “$” sign Signup and view all the answers

What is the purpose of the PHP command 'echo'?

The purpose of the PHP command 'echo' is to output the parameters passed to it. Signup and view all the answers

What is the syntax for the 'echo' command in PHP?

The syntax for the 'echo' command in PHP is void echo(string arg1 [, string argn]). Signup and view all the answers

How is concatenation achieved in PHP?

Concatenation in PHP is achieved by using a period (.) to join strings into one. Signup and view all the answers

What is the purpose of escaping the character in PHP?

The purpose of escaping the character in PHP is to ignore and display double quotation marks that must remain visible in a string. Signup and view all the answers

What are control structures in PHP and give an example of one?

Control structures in PHP are the structures that allow us to control the flow of execution through a program or script. An example is the if/else statement. Signup and view all the answers

How is the date displayed in PHP using the 'date' function?

The date is displayed in PHP using the 'date' function by specifying the format symbols such as 'Y' for year, 'm' for month, and 'd' for day. Signup and view all the answers

What is the format for function headers in PHP?

The format for function headers in PHP is function functionName($arg_1, $arg_2, ..., $arg_n). Signup and view all the answers

What is the purpose of including files in PHP?

The purpose of including files in PHP is to insert the code from those files into the current code, providing useful and protective means once you co. Signup and view all the answers

What are global variables and how are they different from local variables in PHP?

Global variables can be used anywhere, while local variables are restricted to a function or class. Signup and view all the answers

What is the function of arithmetic operations in PHP?

The function of arithmetic operations in PHP is to perform mathematical calculations, such as addition, subtraction, multiplication, and division, on variables. Signup and view all the answers

Study Notes

PHP Basics

PHP stands for Hypertext Preprocessor
PHP scripts are embedded within HTML pages, usually between <?php and ?> tags
PHP scripts are executed on the server-side, generating HTML, CSS, JavaScript, and other files that are sent to the client's web browser

PHP Language

PHP is a server-side scripting language
PHP is a high-level language, interpreted and loose-typed

PHP Commenting

Comment symbols in PHP are // for single-line comments and /* */ for multi-line comments

PHP Variables

PHP variables start with a dollar sign ($) followed by the variable name
Variables are case-sensitive in PHP

PHP Output

The 'echo' command is used to output data to the screen
The syntax for the 'echo' command is simply "echo" followed by the data to be output
'echo' can output strings, variables, and expressions

PHP String Operations

Concatenation is achieved in PHP using the dot (.) operator
Escaping characters in PHP is done using a backslash ()

PHP Control Structures

Control structures in PHP are used to control the flow of a program
An example of a control structure is the 'if' statement, which executes a block of code if a condition is true

PHP Date and Time

The 'date' function is used to display the current date and time in PHP
The format for the 'date' function is "date(format[, timestamp])"

PHP Functions

Function headers in PHP are defined using the "function" keyword followed by the function name and parameters in parentheses
Functions are reusable blocks of code that take arguments and return values

PHP File Inclusion

Including files in PHP allows for code reuse and organization
Files are included using the "include" or "require" statements

PHP Variables Scope

Global variables are accessible from any part of the script
Local variables are only accessible within the block they were defined in
Global variables can be accessed from within a function using the "global" keyword

PHP Arithmetic Operations

Arithmetic operations in PHP are used to perform mathematical operations
Examples of arithmetic operations include addition (+), subtraction (-), multiplication (*), and division (/)

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Description

This tutorial aims to provide basic knowledge about PHP and MySQL, focusing on explaining code examples and offering useful references. It covers the definition of PHP as a server-side scripting language used for generating dynamic web pages, and explains how PHP scripts can be embedded within HTML pages. The tutorial also introduces MySQL and its integration with PHP for database management.