Lecture notes, Introduction to PHP Programming PDF

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Introduction to PHP Programming

What is PHP? ●

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PHP: Hypertext Processor Server-side scripting language Interpreted

My First PHP Script

Running the Script $ php -f helloworld.php Hello World! $

Understanding CGI Web Server

GET helloworld.php

Understanding CGI Web Server

Web Server

Fork

Understanding CGI Web Server

PHP Interpreter

Exec

Understanding CGI Request Parameters

Web Server

PHP Interpreter Generated HTML Document

Pass Data

Understanding CGI Web Server

Generated HTML sent to client

Another Way

The Other Result $ php -f helloworldweb2.php

Another Way to Do It

Hello World!

Integrating with HTML

My First Integrated Script





Result of Integrating $ php -f helloworldweb.php

My First Integrated Script





PHP Variables

Properties of Variables ●

Loosely Typed

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Reusable

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Two forms: –

Assign by value

–

Assign by reference

Naming Variables

$[A-Za-z_][A-Za-z0-9_]*

Types of Variables ●

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Scalar –

Boolean

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Integer

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Float

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String

Compound –

Array

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Object

Predefined Variables ●

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Variables that are available to all scripts Examples –

argc

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argv

Superglobals –

$_GET

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$_POST $GLOBALS

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Boolean: What is FALSE? ●

FALSE

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integer 0

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Float 0.0

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the empty string and the string "0" an array with zero elements NULL (including unset variables)

Integers ●

$a = 1234;

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$a = -123;

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$a = 0123;

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$a = 0x1A;

Strings ●

'My string'

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“My string\n”

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$str =...