Maxxus PRO SPK-23 Especificaciones descargar pdf (Pagina 7)

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CONTENTS

vii

Breaking Out of a Control Structure or Script ....................................47

Next: Saving the Customer’s Order ......................................................47

2 Storing and Retrieving Data 49

Saving Data for Later ..........................................................................50

Storing and Retrieving Bob’s Orders ..................................................50

Overview of File Processing ................................................................52

Opening a File ......................................................................................52

File Modes ......................................................................................52

Using fopen() to Open a File ..........................................................53

Opening Files for FTP or HTTP ....................................................54

Problems Opening Files ..................................................................55

Writing to a File ....................................................................................57

Parameters for fwrite() ....................................................................57

File Formats ....................................................................................58

Closing a File ........................................................................................58

Reading from a File ..............................................................................59

Opening a File for Reading: fopen() ..............................................60

Knowing When to Stop: feof() ........................................................60

Reading a Line at a Time: fgets(), fgetss(), and fgetcsv() ..............60

Reading the Whole File: readfile(), fpassthru(), file() ....................61

Reading a Character: fgetc() ..........................................................62

Reading an Arbitrary Length: fread() ..............................................63

Other Useful File Functions ................................................................63

Checking Whether a File Is There: file_exists() ............................63

Knowing How Big a File Is: filesize() ............................................63

Deleting a File: unlink() ..................................................................63

Navigating Inside a File: rewind(), fseek(), and ftell() ..................64

File Locking ..........................................................................................65

Doing It a Better Way: Database Management Systems ......................66

Problems with Using Flat Files ......................................................66

How RDBMSs Solve These Problems ............................................67

Further Reading ....................................................................................67

Next ......................................................................................................67

3 Using Arrays 69

What Is an Array? ................................................................................70

Numerically Indexed Arrays ................................................................71

Initializing Numerically Indexed Arrays ........................................71

Accessing Array Contents ..............................................................72

Using Loops to Access the Array ....................................................73

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Maxxus PRO SPK-23 Especificaciones Pagina 7

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