Specifications

CONTENTS

Using Encryption in PHP ..................................................................338

Further Reading ..................................................................................347

Next ....................................................................................................347

PART IV Advanced PHP Techniques 349

16 Interacting with the File System and the Server 351

Introduction to File Upload ................................................................352

HTML for File Upload ..................................................................353

Writing the PHP to Deal with the File ..........................................354

Common Problems ........................................................................358

Using Directory Functions ..................................................................358

Reading from Directories ..............................................................358

Getting Info About the Current Directory ....................................360

Creating and Deleting Directories ................................................360

Interacting with the File System ........................................................361

Get File Info ..................................................................................361

Changing File Properties ..............................................................364

Creating, Deleting, and Moving Files ..........................................364

Using Program Execution Functions ..................................................365

Interacting with the Environment: getenv() and putenv() ..................367

Further Reading ..................................................................................368

Next ....................................................................................................368

17 Using Network and Protocol Functions 369

Overview of Protocols ........................................................................370

Sending and Reading Email ..............................................................371

Using Other Web Services ..................................................................371

Using Network Lookup Functions ....................................................374

Using FTP ..........................................................................................378

Using FTP to Back Up or Mirror a File ........................................378

Uploading Files ............................................................................385

Avoiding Timeouts ........................................................................385

Using Other FTP Functions ..........................................................386

Generic Network Communications with cURL ................................387

Further Reading ..................................................................................389

Next ....................................................................................................390

18 Managing the Date and Time 391

Getting the Date and Time from PHP ................................................392

Using the date() Function ..............................................................392

Dealing with UNIX Time Stamps ................................................394

Using the getdate() Function ........................................................395

Validating Dates ............................................................................396

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