Maxxus PRO SPK-23 Especificaciones Pagina 9

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CONTENTS
ix
Introduction to Regular Expressions ..................................................109
The Basics ....................................................................................109
Character Sets and Classes ............................................................110
Repetition ......................................................................................111
Subexpressions ..............................................................................111
Counted Subexpressions ................................................................112
Anchoring to the Beginning or End of a String ............................112
Branching ......................................................................................112
Matching Literal Special Characters ............................................112
Summary of Special Characters ....................................................113
Putting It All Together for the Smart Form ..................................113
Finding Substrings with Regular Expressions ....................................114
Replacing Substrings with Regular Expressions ................................115
Splitting Strings with Regular Expressions ........................................115
Comparison of String Functions and Regular Expression
Functions ..........................................................................................116
Further Reading ..................................................................................116
Next ....................................................................................................116
5 Reusing Code and Writing Functions 117
Why Reuse Code? ..............................................................................118
Cost ................................................................................................118
Reliability ......................................................................................119
Consistency ....................................................................................119
Using require() and include() ............................................................119
Using require() ..............................................................................119
File Name Extensions and Require() ............................................120
PHP Tags and require() ................................................................121
Using require() for Web Site Templates ............................................121
Using auto_prepend_file and auto_append_file ............................126
Using include() ..............................................................................127
Using Functions in PHP ....................................................................129
Calling Functions ..........................................................................129
Call to Undefined Function ..........................................................131
Case and Function Names ............................................................132
Why Should You Define Your Own Functions? ................................132
Basic Function Structure ....................................................................132
Naming Your Function ..................................................................133
Parameters ..........................................................................................134
Scope ..................................................................................................136
Pass by Reference Versus Pass by Value ............................................138
Returning from Functions ..................................................................140
00 7842 FM 3/6/01 3:38 PM Page ix
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