PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

xii
Contents
Writing to a File 67
Parameters for fwrite() 68
File Formats 68
Closing a File 69
Reading from a File 71
Opening a File for Reading: fopen() 72
Knowing When to Stop: feof() 73
Reading a Line at a Time: fgets(), fgetss(), and
fgetcsv() 73
Reading the Whole File: readfile(), fpassthru(), and
file() 74
Reading a Character: fgetc() 75
Reading an Arbitrary Length: fread() 75
Using Other Useful File Functions 76
Checking Whether a File Is There:
file_exists() 76
Determining How Big a File Is: filesize() 76
Deleting a File: unlink() 76
Navigating Inside a File: rewind(), fseek(), and
ftell() 76
Locking Files 78
A Better Way: Database Management Systems 79
Problems with Using Flat Files 79
How RDBMSs Solve These Problems 80
Further Reading 80
Next 80
3 Using Arrays 81
What Is an Array? 81
Numerically Indexed Arrays 82
Initializing Numerically Indexed Arrays 82
Accessing Array Contents 83
Using Loops to Access the Array 84
Arrays with Different Indices 85
Initializing an Array 85
Accessing the Array Elements 85
Using Loops 85