"for" Statements

This section describes how 'for' statements works in PHP. One or more statements are repeatedly executed as long as the specified condition is true. 'for' statements has extra expressions for loop initialization and loop control update.

The "for" statement is the most complex loop statement in PHP. There are 4 forms of "while" statements supported in PHP:

1. Empty-statement "for":

   for (initial_exepression; stop_condition; repeating_expression);

2. Single-statement "for":

   for (initial_exepression; stop_condition; repeating_expression)

3. Multi-statement "for":

   for (initial_exepression; stop_condition; repeating_expression) {

4. Multi-statement "for ... endfor":

   for (initial_exepression; stop_condition; repeating_expression):

All forms of "for" statements are executed like this:

Step 1: "initial_exepression" is evaluated unconditionally. The "initial_exepression" is usually used to assign the initial value to a loop control variable, like $i=0.

Step 2: Evaluate "stop_condition" as a Boolean value. The "stop_condition" is usually a comparison expression against the loop control variable, like $i<100.

Step 3: If "stop_condition" returns TRUE, continue with Step 5.

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

Step 5: Execute the statement or statements enclosed in the loop.

Step 6: Evaluate "repeating_expression". The "repeating_expression" is usually an expression to increment the value of the loop control variable, like $i++.

Step 7: Continue with Step 2.

If you want to terminate the loop early, you can use the "break" statement inside the loop, which will terminate the loop immediately.

Last update: 2015.

Table of Contents

 About This Book

 Introduction and Installation of PHP 7.0

 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

 Configuring and Sending out Emails

 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

 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

 Introduction of Class and Object

 Integrating PHP with Apache Web Server

 Outdated Tutorials


 PDF Printing Version