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		<id>https://www.techotopia.com/index.php?title=PHP_Essentials&amp;diff=1519</id>
		<title>PHP Essentials</title>
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				<updated>2007-06-13T17:18:04Z</updated>
		
		<summary type="html">&lt;p&gt;Andymeows: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;# [[About PHP Essentials]]&lt;br /&gt;
#* [[About PHP Essentials|Intended Audience]]&lt;br /&gt;
# [[The History of PHP]]&lt;br /&gt;
#* [[The History of PHP|The Creation of PHP]]&lt;br /&gt;
#* [[The History of PHP|PHP 3 Hits the Big Time]]&lt;br /&gt;
#* [[The History of PHP|PHP 4 - Optimization, Scalabilty and More]]&lt;br /&gt;
#* [[The History of PHP|PHP 5 - Object Orientation, Error Handling and XML]]&lt;br /&gt;
#* [[The History of PHP|How Popular is PHP?]]&lt;br /&gt;
# [[An Overview of PHP]]&lt;br /&gt;
#* [[An Overview of PHP|What Exactly is PHP?]]&lt;br /&gt;
#* [[An Overview of PHP|How Does PHP Work?]]&lt;br /&gt;
#* [[An Overview of PHP|Why is PHP so Useful?]]&lt;br /&gt;
#* [[An Overview of PHP|Summary]]&lt;br /&gt;
# [[Creating a Simple PHP Script]]&lt;br /&gt;
#* [[Creating a Simple PHP Script|The PHP Code Delimiters]]&lt;br /&gt;
#* [[Creating a Simple PHP Script|Testing the PHP Installation]]&lt;br /&gt;
#* [[Creating a Simple PHP Script|Emdedding PHP into an HTML File]]&lt;br /&gt;
#* [[Creating a Simple PHP Script|Embedding HTML into a PHP Script]]&lt;br /&gt;
#* [[Creating a Simple PHP Script|Summary]]&lt;br /&gt;
# [[Commenting PHP Code]]&lt;br /&gt;
#*  [[Commenting PHP Code|PHP Single Line Comments]]&lt;br /&gt;
#*  [[Commenting PHP Code|PHP Multi-line Comments]]&lt;br /&gt;
#* [[Commenting PHP Code|Summary]]&lt;br /&gt;
# [[An Introduction to PHP Variables]]&lt;br /&gt;
#* [[An Introduction to PHP Variables|Naming and Creating a Variable in PHP]]&lt;br /&gt;
#* [[An Introduction to PHP Variables|Assigning a Value to a PHP Variable]]&lt;br /&gt;
#* [[An Introduction to PHP Variables|Accessing PHP Variable Values]]&lt;br /&gt;
#* [[An Introduction to PHP Variables|Changing the Type of a PHP Variable]]&lt;br /&gt;
#* [[An Introduction to PHP Variables|Checking Whether a Variable is Set]]&lt;br /&gt;
# [[Understanding PHP Variable Types]]&lt;br /&gt;
#* [[Understanding PHP Variable Types|The PHP Integer Variable Type]]&lt;br /&gt;
#* [[Understanding PHP Variable Types|The PHP Float Variable Type]]&lt;br /&gt;
#* [[Understanding PHP Variable Types|The PHP Boolean Variable Type]]&lt;br /&gt;
#* [[Understanding PHP Variable Types|The PHP String Variable]]&lt;br /&gt;
#* [[Understanding PHP Variable Types|Extracting and Writing String Fragments]]&lt;br /&gt;
#* [[Understanding PHP Variable Types|Creating PHP heredoc Strings]]&lt;br /&gt;
# [[PHP Constants]]&lt;br /&gt;
#* [[PHP Constants|Defining a PHP Constant]]&lt;br /&gt;
#* [[PHP Constants|Checking if a PHP Constant is Defined]]&lt;br /&gt;
#* [[PHP Constants|Using a Variable as a Constant Name]]&lt;br /&gt;
#* [[PHP Constants|Predefined PHP Constants]]&lt;br /&gt;
#* [[PHP Constants|PHP Script and Environment Related Constants]]&lt;br /&gt;
#* [[PHP Constants|PHP Mathematical Constants]]&lt;br /&gt;
# [[PHP Operators]]&lt;br /&gt;
#* [[PHP Operators|PHP Assignment Operators]]&lt;br /&gt;
#* [[PHP Operators|PHP Arithmetic Operators]]&lt;br /&gt;
#* [[PHP Operators|PHP Comparison Operators]]&lt;br /&gt;
#* [[PHP Operators|PHP Logical Operators]]&lt;br /&gt;
#* [[PHP Operators|PHP Increment and Decrement Operators]]&lt;br /&gt;
#* [[PHP Operators|PHP String Concatenation Operator]]&lt;br /&gt;
#* [[PHP Operators|Concatenation of Numbers and Strings in PHP]]&lt;br /&gt;
#* [[PHP Operators|PHP Execution Operator - Executing Server Side Commands]]&lt;br /&gt;
# [[PHP Flow Control and Looping]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|PHP Conditional Statements]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|The PHP if Statement]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|The PHP if ... else Statements]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|PHP Looping Statements]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|PHP for loops]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|PHP while loops]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|PHP do ... while loops]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|PHP switch Statements]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|Breaking a Loop]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|Breaking Out of Nested Loops]]&lt;br /&gt;
#* [[PHP Flow Control and Looping|Skipping Statements in Current Loop Iteration]]&lt;br /&gt;
# [[PHP Functions]]&lt;br /&gt;
#* [[PHP Functions|What is a PHP Function?]]&lt;br /&gt;
#* [[PHP Functions|How to Write a PHP Function]]&lt;br /&gt;
#* [[PHP Functions|Returning a Value from a PHP Function]]&lt;br /&gt;
#* [[PHP Functions|Passing Parameters to a PHP Function]]&lt;br /&gt;
#* [[PHP Functions|Calling PHP Functions]]&lt;br /&gt;
#* [[PHP Functions|Passing Parameters By Reference]]&lt;br /&gt;
#* [[PHP Functions|Returning Values By Reference]]&lt;br /&gt;
#* [[PHP Functions|Functions and Variable Scope]]&lt;br /&gt;
# [[PHP Arrays]]&lt;br /&gt;
#* [[PHP Arrays|How to Create a PHP Array]]&lt;br /&gt;
#* [[PHP Arrays|Accessing Elements in a PHP Array]]&lt;br /&gt;
#* [[PHP Arrays|Creating an Associative Array]]&lt;br /&gt;
#* [[PHP Arrays|Accessing Elements of an Associative Array]]&lt;br /&gt;
#* [[PHP Arrays|Accessing Elements in a Multidimensional PHP Array]]&lt;br /&gt;
#* [[PHP Arrays|Using PHP Array Pointers]]&lt;br /&gt;
#* [[PHP Arrays|Changing, Adding and Removing PHP Array Elements]]&lt;br /&gt;
#* [[PHP Arrays|Looping through PHP Array Elements]]&lt;br /&gt;
#* [[PHP Arrays|Replacing Sections of an Array]]&lt;br /&gt;
#* [[PHP Arrays|Sorting a PHP Array]]&lt;br /&gt;
#* [[PHP Arrays|Sorting Associative Arrays]]&lt;br /&gt;
#* [[PHP Arrays|Getting Information About PHP Arrays &amp;amp; other Array Functions]]&lt;br /&gt;
#* [[PHP Arrays|Summary]]&lt;br /&gt;
# [[Working with Strings and Text in PHP]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Changing the Case of a PHP String]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Converting to and from ASCII Values]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Printing Formatted Strings in PHP]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|PHP printf formatting specifiers]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Finding the Length of a PHP String]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Converting a String into a PHP Array]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Removing Leading and Trailing Whitespace from a PHP String]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Comparing Strings in PHP]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|String Comparison Functions Return Value]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Accessing and Modifiying Characters in String]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Searching for Characters and Substrings in a PHP String]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Extracting and Replacing Substrings in PHP]]&lt;br /&gt;
#* [[Working with Strings and Text in PHP|Replacing All Instances of a Word in a PHP String]]&lt;br /&gt;
# [[PHP, Filesystems and File I/O]]&lt;br /&gt;
#* [[PHP, Filesystems and File I/O|Opening and Creating Files in PHP]]&lt;br /&gt;
#* [[PHP, Filesystems and File I/O|Closing Files in PHP]]&lt;br /&gt;
#* [[PHP, Filesystems and File I/O|Writing to a File using PHP]]&lt;br /&gt;
#* [[PHP, Filesystems and File I/O|Reading From a File using PHP]]&lt;br /&gt;
#* [[PHP, Filesystems and File I/O|Checking Whether a File Exists]]&lt;br /&gt;
#* [[PHP, Filesystems and File I/O|Moving, Copying and Deleting Files with PHP]]&lt;br /&gt;
#* [[PHP, Filesystems and File I/O|Accessing File Attributes]]&lt;br /&gt;
#* [[PHP, Filesystems and File I/O|PHP Output Buffering]]&lt;br /&gt;
# [[Working with Directories in PHP]]&lt;br /&gt;
#* [[Working with Directories in PHP|Creating Directories in PHP]]&lt;br /&gt;
#* [[Working with Directories in PHP|Deleting a Directory]]&lt;br /&gt;
#* [[Working with Directories in PHP|Finding and Changing the Current Working Directory]]&lt;br /&gt;
#* [[Working with Directories in PHP|Listing Files in a Directory]]&lt;br /&gt;
# [[An Overview of HTML Forms]]&lt;br /&gt;
#* [[An Overview of HTML Forms|Creating HTML Forms]]&lt;br /&gt;
#* [[An Overview of HTML Forms|HTML Text Object]]&lt;br /&gt;
#* [[An Overview of HTML Forms|HTML TextArea Object]]&lt;br /&gt;
#* [[An Overview of HTML Forms|The HTML Button Object]]&lt;br /&gt;
#* [[An Overview of HTML Forms|HTML Check Boxes]]&lt;br /&gt;
#* [[An Overview of HTML Forms|HTML Radio Buttons]]&lt;br /&gt;
#* [[An Overview of HTML Forms|HTML Drop-down / Select Object]]&lt;br /&gt;
#* [[An Overview of HTML Forms|HTML Password Object]]&lt;br /&gt;
#* [[An Overview of HTML Forms|Summary]]&lt;br /&gt;
# [[PHP and HTML Forms]]&lt;br /&gt;
#* [[PHP and HTML Forms|Creating the Form]]&lt;br /&gt;
#* [[PHP and HTML Forms|Processing Form Data Using PHP]]&lt;br /&gt;
#* [[PHP and HTML Forms|Processing Multiple Selections with PHP]]&lt;br /&gt;
# [[PHP and Cookies - Creating, Reading and Writing]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|The Difference Between Cookies and PHP Sessions]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|The Structure of a Cookie]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|Cookie Name / Value Pair]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|Cookie Expiration Setting]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|Cookie path Setting]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|Cookie domain Setting]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|Cookie Security Setting]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|Creating a Cookie in PHP]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|Reading a Cookie in PHP]]&lt;br /&gt;
#* [[PHP and Cookies - Creating, Reading and Writing|Deleting a Cookie]]&lt;br /&gt;
# [[Understanding PHP Sessions]]&lt;br /&gt;
#* [[Understanding PHP Sessions|What is a PHP Session?]]&lt;br /&gt;
#* [[Understanding PHP Sessions|Creating a PHP Session]]&lt;br /&gt;
#* [[Understanding PHP Sessions|Creating and Reading PHP Session Variables]]&lt;br /&gt;
#* [[Understanding PHP Sessions|Writing PHP Session Data to a File]]&lt;br /&gt;
#* [[Understanding PHP Sessions|Reading a Saved PHP Session]]&lt;br /&gt;
# [[PHP Object Oriented Programming]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|What is an Object?]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|What is a Class?]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|How is an Object Created from a Class?]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|What is sub-classing?]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|Defining a PHP Class]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|PHP Class Constructors and Destructors]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|Creating Members in a PHP Class]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|Defining and Calling Methods]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|Subclassing in PHP]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|PHP Object Serialization]]&lt;br /&gt;
#* [[PHP Object Oriented Programming|Getting Information about a PHP Object]]&lt;br /&gt;
# [[Using PHP with MySQL]]&lt;br /&gt;
#* [[Using PHP with MySQL|Creating a MySQL User Account]]&lt;br /&gt;
#* [[Using PHP with MySQL|Creating and Select MySQL Database]]&lt;br /&gt;
#* [[Using PHP with MySQL|Creating a MySQL Database Table]]&lt;br /&gt;
#* [[Using PHP with MySQL|Inserting Data into a MySQL Database Table]]&lt;br /&gt;
#* [[Using PHP with MySQL|Connecting with PHP to a MySQL Server]]&lt;br /&gt;
#* [[Using PHP with MySQL|Selecting Records from a MySQL Database Using PHP]]&lt;br /&gt;
#* [[Using PHP with MySQL|Adding Records to MySQL Database using PHP]]&lt;br /&gt;
#* [[Using PHP with MySQL|Modifying and Deleting MySQL Records using PHP]]&lt;br /&gt;
#* [[Using PHP with MySQL|Using PHP to get Information about a MySQL Database]]&lt;br /&gt;
#* [[Using PHP with MySQL|Summary]]&lt;br /&gt;
#[[PHP and SQLite]]&lt;br /&gt;
#* [[PHP and SQLite|Creating an SQLite Database with PHP]]&lt;br /&gt;
#* [[PHP and SQLite|Using PHP to Add Records to an SQLite Database]]&lt;br /&gt;
#* [[PHP and SQLite|Using PHP to Select Records from an SQLite Database]]&lt;br /&gt;
&lt;br /&gt;
[[Category:Web Development]]&lt;/div&gt;</summary>
		<author><name>Andymeows</name></author>	</entry>

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