"do ... while" Statements

This section describes how 'do ... while' statements works in PHP. One or more statements are repeatedly executed as long as the specified condition is true.

PHP also supports a variation of the "while" statement called "do ... while" statement. with 2 forms:

1. Single-statement "do ... while":

   do statement while (condition);

2. Multi-statement "do ... while":

   do {
   } while (condition);

All forms of "do ... while" statements are executed like this:

Step 1: Execute the statement or statements enclosed in the loop.

Step 2: Evaluate "condition" as a Boolean value.

Step 3: If "condition" returns TRUE, continue with Step 1.

Step 4: If "condition" returns "FALSE", terminate the loop.

Of course, you can use the "break" statement inside the loop to terminate the loop immediately.

I will leave it to you to write some sample scripts for "do ... while" statements as exercises.

Table of Contents

 About This Book

 Introduction and Installation of PHP 7.3

 PHP Script File Syntax

 PHP Data Types and Data Literals

 Variables, References, and Constants

 Expressions, Operations and Type Conversions

 Conditional Statements - "if" and "switch"

Loop Statements - "while", "for", and "do ... while"

 "while" Statements

 "while" Statement Examples

 "for" Statements

 "for" Statement Examples

"do ... while" Statements

 "break" and "continue" Statements

 Function Declaration, Arguments, and Return Values

 Arrays - Ordered Maps

 Interface with Operating System

 Introduction of Class and Object

 Integrating PHP with Apache Web Server

 Retrieving Information from HTTP Requests

 Creating and Managing Sessions in PHP Scripts

 Sending and Receiving Cookies in PHP Scripts

 Controlling HTTP Response Header Lines in PHP Scripts

 Managing File Upload

 MySQL Server Connection and Access Functions

 Functions to Manage Directories, Files and Images

 SOAP Extension Function and Calling Web Services

 SOAP Server Functions and Examples

 Localization Overview of Web Applications

 Using Non-ASCII Characters in HTML Documents

 Using Non-ASCII Characters as PHP Script String Literals

 Receiving Non-ASCII Characters from Input Forms

 "mbstring" Extension and Non-ASCII Encoding Management

 Managing Non-ASCII Character Strings with MySQL Servers

 Parsing and Managing HTML Documents

 Configuring and Sending out Emails

 Image and Picture Processing

 Managing ZIP Archive Files

 Managing PHP Engine and Modules on macOS

 Managing PHP Engine and Modules on CentOS

 Outdated Tutorials


 Full Version in PDF/EPUB