book

PHP Cookbook, 3rd Edition

by David Sklar, Adam Trachtenberg

July 2014

Intermediate to advanced

820 pages

17h 6m

English

O'Reilly Media, Inc.

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Preface
Who This Book Is ForWhat Is in This BookOther ResourcesConventions Used in This BookComments and QuestionsAcknowledgments
1. Strings
IntroductionAccessing SubstringsExtracting SubstringsReplacing SubstringsProcessing a String One Byte at a TimeReversing a String by Word or ByteGenerating a Random StringExpanding and Compressing TabsControlling CaseInterpolating Functions and Expressions Within StringsTrimming Blanks from a StringGenerating Comma-Separated DataParsing Comma-Separated DataGenerating Fixed-Width Field Data RecordsParsing Fixed-Width Field Data RecordsTaking Strings ApartWrapping Text at a Certain Line LengthStoring Binary Data in StringsProgram: Downloadable CSV File
2. Numbers
IntroductionChecking Whether a Variable Contains a Valid NumberComparing Floating-Point NumbersRounding Floating-Point NumbersOperating on a Series of IntegersGenerating Random Numbers Within a RangeGenerating Predictable Random NumbersGenerating Biased Random NumbersTaking LogarithmsCalculating ExponentsFormatting NumbersFormatting Monetary ValuesPrinting Correct PluralsCalculating Trigonometric FunctionsDoing Trigonometry in Degrees, Not RadiansHandling Very Large or Very Small NumbersConverting Between BasesCalculating Using Numbers in Bases Other Than DecimalFinding the Distance Between Two Places
3. Dates and Times
IntroductionFinding the Current Date and TimeConverting Time and Date Parts to an Epoch TimestampConverting an Epoch Timestamp to Time and Date PartsPrinting a Date or Time in a Specified FormatFinding the Difference of Two DatesFinding the Day in a Week, Month, or YearValidating a DateParsing Dates and Times from StringsAdding to or Subtracting from a DateCalculating Time with Time Zones and Daylight Saving TimeGenerating a High-Precision TimeGenerating Time RangesUsing Non-Gregorian CalendarsProgram: Calendar
4. Arrays
IntroductionSpecifying an Array Not Beginning at Element 0Storing Multiple Elements per Key in an ArrayInitializing an Array to a Range of IntegersIterating Through an ArrayDeleting Elements from an ArrayChanging Array SizeAppending One Array to AnotherTurning an Array into a StringPrinting an Array with CommasChecking if a Key Is in an ArrayChecking if an Element Is in an ArrayFinding the Position of a Value in an ArrayFinding Elements That Pass a Certain TestFinding the Largest or Smallest Valued Element in an ArrayReversing an ArraySorting an ArraySorting an Array by a Computable FieldSorting Multiple ArraysSorting an Array Using a Method Instead of a FunctionRandomizing an ArrayRemoving Duplicate Elements from an ArrayApplying a Function to Each Element in an ArrayFinding the Union, Intersection, or Difference of Two ArraysIterating Efficiently over Large or Expensive DatasetsAccessing an Object Using Array Syntax
5. Variables
IntroductionAvoiding == Versus = ConfusionEstablishing a Default ValueExchanging Values Without Using Temporary VariablesCreating a Dynamic Variable NamePersisting a Local Variable’s Value Across Function InvocationsSharing Variables Between ProcessesEncapsulating Complex Data Types in a StringDumping Variable Contents as Strings
6. Functions
IntroductionAccessing Function ParametersSetting Default Values for Function ParametersPassing Values by ReferenceUsing Named ParametersEnforcing Types of Function ArgumentsCreating Functions That Take a Variable Number of ArgumentsReturning Values by ReferenceReturning More Than One ValueSkipping Selected Return ValuesReturning FailureCalling Variable FunctionsAccessing a Global Variable Inside a FunctionCreating Dynamic Functions
7. Classes and Objects
IntroductionInstantiating ObjectsDefining Object ConstructorsDefining Object DestructorsImplementing Access ControlPreventing Changes to Classes and MethodsDefining Object StringificationRequiring Multiple Classes to Behave SimilarlyCreating Abstract Base ClassesAssigning Object ReferencesCloning ObjectsOverriding Property AccessesCalling Methods on an Object Returned by Another MethodAggregating ObjectsAccessing Overridden MethodsCreating Methods DynamicallyUsing Method PolymorphismDefining Class ConstantsDefining Static Properties and MethodsControlling Object SerializationIntrospecting ObjectsChecking If an Object Is an Instance of a Specific ClassAutoloading Class Files upon Object InstantiationInstantiating an Object DynamicallyProgram: whereis
8. Web Fundamentals
IntroductionSetting CookiesReading Cookie ValuesDeleting CookiesBuilding a Query StringReading the POST Request BodyUsing HTTP Basic or Digest AuthenticationUsing Cookie AuthenticationReading an HTTP HeaderWriting an HTTP HeaderSending a Specific HTTP Status CodeRedirecting to a Different LocationFlushing Output to the BrowserBuffering Output to the BrowserCompressing Web OutputReading Environment VariablesSetting Environment VariablesCommunicating Within ApacheRedirecting Mobile Browsers to a Mobile Optimized SiteProgram: Website Account (De)activatorProgram: Tiny WikiProgram: HTTP Range
9. Forms
IntroductionProcessing Form InputValidating Form Input: Required FieldsValidating Form Input: NumbersValidating Form Input: Email AddressesValidating Form Input: Drop-Down MenusValidating Form Input: Radio ButtonsValidating Form Input: CheckboxesValidating Form Input: Dates and TimesValidating Form Input: Credit CardsPreventing Cross-Site ScriptingProcessing Uploaded FilesWorking with Multipage FormsRedisplaying Forms with Inline Error MessagesGuarding Against Multiple Submissions of the Same FormPreventing Global Variable InjectionHandling Remote Variables with Periods in Their NamesUsing Form Elements with Multiple OptionsCreating Drop-Down Menus Based on the Current Date

10. Database Access
IntroductionUsing DBM DatabasesUsing an SQLite DatabaseConnecting to an SQL DatabaseQuerying an SQL DatabaseRetrieving Rows Without a LoopModifying Data in an SQL DatabaseRepeating Queries EfficientlyFinding the Number of Rows Returned by a QueryEscaping QuotesLogging Debugging Information and ErrorsCreating Unique IdentifiersBuilding Queries ProgrammaticallyMaking Paginated Links for a Series of RecordsCaching Queries and ResultsAccessing a Database Connection Anywhere in Your ProgramProgram: Storing a Threaded Message BoardUsing Redis
11. Sessions and Data Persistence
IntroductionUsing Session TrackingPreventing Session HijackingPreventing Session FixationStoring Sessons in MemcachedStoring Sessions in a DatabaseStoring Arbitrary Data in Shared MemoryCaching Calculated Results in Summary Tables
12. XML
IntroductionGenerating XML as a StringGenerating XML with DOMParsing Basic XML DocumentsParsing Complex XML DocumentsParsing Large XML DocumentsExtracting Information Using XPathTransforming XML with XSLTSetting XSLT Parameters from PHPCalling PHP Functions from XSLT StylesheetsValidating XML DocumentsHandling Content EncodingReading RSS and Atom FeedsWriting RSS FeedsWriting Atom Feeds
13. Web Automation
IntroductionMarking Up a Web PageCleaning Up Broken or Nonstandard HTMLExtracting Links from an HTML FileConverting Plain Text to HTMLConverting HTML to Plain TextRemoving HTML and PHP TagsResponding to an Ajax RequestIntegrating with JavaScriptProgram: Finding Stale LinksProgram: Finding Fresh Links
14. Consuming RESTful APIs
IntroductionFetching a URL with the GET MethodFetching a URL with the POST Method and Form DataFetching a URL with an Arbitrary Method and POST BodyFetching a URL with CookiesFetching a URL with Arbitrary HeadersFetching a URL with a TimeoutFetching an HTTPS URLDebugging the Raw HTTP ExchangeMaking an OAuth 1.0 RequestMaking an OAuth 2.0 Request
15. Serving RESTful APIs
IntroductionExposing and Routing to a ResourceExposing Clean Resource PathsExposing a Resource for ReadingCreating a ResourceEditing a ResourceDeleting a ResourceIndicating Errors and FailuresSupporting Multiple Formats
16. Internet Services
IntroductionSending MailSending MIME MailReading Mail with IMAP or POP3Getting and Putting Files with FTPLooking Up Addresses with LDAPUsing LDAP for User AuthenticationPerforming DNS LookupsChecking If a Host Is AliveGetting Information About a Domain Name
17. Graphics
IntroductionDrawing Lines, Rectangles, and PolygonsDrawing Arcs, Ellipses, and CirclesDrawing with Patterned LinesDrawing TextDrawing Centered TextBuilding Dynamic ImagesGetting and Setting a Transparent ColorOverlaying WatermarksCreating Thumbnail ImagesReading EXIF DataServing Images SecurelyProgram: Generating Bar Charts from Poll Results
18. Security and Encryption
IntroductionPreventing Session FixationProtecting Against Form SpoofingEnsuring Input Is FilteredAvoiding Cross-Site ScriptingEliminating SQL InjectionKeeping Passwords Out of Your Site FilesStoring PasswordsDealing with Lost PasswordsVerifying Data with HashesEncrypting and Decrypting DataStoring Encrypted Data in a File or DatabaseSharing Encrypted Data with Another WebsiteDetecting SSLEncrypting Email with GPG
19. Internationalization and Localization
IntroductionDetermining the User’s LocaleLocalizing Text MessagesLocalizing Dates and TimesLocalizing NumbersLocalizing Currency ValuesLocalizing ImagesLocalizing Included FilesSorting in a Locale-Aware OrderManaging Localization ResourcesSetting the Character Encoding of Outgoing DataSetting the Character Encoding of Incoming DataManipulating UTF-8 Text
20. Error Handling
IntroductionFinding and Fixing Parse ErrorsCreating Your Own Exception ClassesPrinting a Stack TraceReading Configuration VariablesSetting Configuration VariablesHiding Error Messages from UsersTuning Error HandlingUsing a Custom Error HandlerLogging ErrorsEliminating “headers already sent” ErrorsLogging Debugging Information
21. Software Engineering
IntroductionUsing a Debugger ExtensionWriting a Unit TestWriting a Unit Test SuiteApplying a Unit Test to a Web PageSetting Up a Test EnvironmentUsing the Built-in Web Server
22. Performance Tuning
IntroductionUsing an AcceleratorTiming Function ExecutionTiming Program Execution by FunctionTiming Program Execution by StatementTiming Program Execution by SectionProfiling with a Debugger ExtensionStress-Testing Your WebsiteAvoiding Regular Expressions
23. Regular Expressions
IntroductionSwitching from ereg to pregMatching WordsFinding the nth Occurrence of a MatchChoosing Greedy or Nongreedy MatchesFinding All Lines in a File That Match a PatternCapturing Text Inside HTML TagsPreventing Parentheses from Capturing TextEscaping Special Characters in a Regular ExpressionReading Records with a Pattern SeparatorUsing a PHP Function in a Regular Expression
24. Files
IntroductionCreating or Opening a Local FileCreating a Temporary FileOpening a Remote FileReading from Standard InputReading a File into a StringCounting Lines, Paragraphs, or Records in a FileProcessing Every Word in a FilePicking a Random Line from a FileRandomizing All Lines in a FileProcessing Variable-Length Text FieldsReading Configuration FilesModifying a File in Place Without a Temporary FileFlushing Output to a FileWriting to Standard OutputWriting to Many Filehandles SimultaneouslyEscaping Shell MetacharactersPassing Input to a ProgramReading Standard Output from a ProgramReading Standard Error from a ProgramLocking a FileReading and Writing Custom File TypesReading and Writing Compressed Files
25. Directories
IntroductionGetting and Setting File TimestampsGetting File InformationChanging File Permissions or OwnershipSplitting a Filename into Its Component PartsDeleting a FileCopying or Moving a FileProcessing All Files in a DirectoryGetting a List of Filenames Matching a PatternProcessing All Files in a Directory RecursivelyMaking New DirectoriesRemoving a Directory and Its ContentsProgram: Web Server Directory ListingProgram: Site Search
26. Command-Line PHP
IntroductionParsing Program ArgumentsParsing Program Arguments with getoptReading from the KeyboardRunning PHP Code on Every Line of an Input FileReading PasswordsColorizing Console OutputProgram: DOM Explorer
27. Packages
IntroductionDefining and Installing Composer DependenciesFinding Composer PackagesInstalling Composer PackagesUsing the PEAR InstallerFinding PEAR PackagesFinding Information About a PackageInstalling PEAR PackagesUpgrading PEAR PackagesUninstalling PEAR PackagesInstalling PECL Packages
Index
Colophon
Copyright

Content preview from PHP Cookbook, 3rd Edition

Chapter 21. Software Engineering

Introduction

Typing out the expressions that form your computer program is only the beginning of building a healthy software system. This chapter discusses what should happen after you’ve written your initial code—tools for debugging and testing your software.

Using a Debugger Extension explores the use of Xdebug, an open source PHP extension that allows for line-by-line debugging in real time.

Recipes , , and explore the world of unit testing in PHP, and show you how to turn your fixed bugs into a test suite that can help you ensure that once a bug is fixed, it stays fixed.

Setting Up a Test Environment introduces you to easy ways to set up a testing environment on your local computer, so that you can work in a sandbox environment without fear of breaking a production website while you’re trying to determine what’s gone wrong.

Lastly, Using the Built-in Web Server explores the built-in web server that’s part of PHP 5.4.0 and later.

Using a Debugger Extension

Problem

You want to debug your scripts interactively during runtime.

Solution

Use the Xdebug extension. When used along with an Xdebug-capable IDE, you can examine data structure; set breakpoints; and step into, out of, or over sections of code interactively.

Discussion

This recipe focuses on Xdebug’s interactive debugging capability. To follow along, you need to be able to compile and install a Zend extension, which means permissions to edit php.ini on your system. PHP’s dl() extension-loading function ...

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ISBN: 9781449363741Errata

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PHP Cookbook, 3rd Edition

by David Sklar, Adam Trachtenberg

Chapter 21. Software Engineering

Introduction