Maxxus PRO SPK-23 Spezifikationen PDF herunterladen (Seite 6)

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PHP AND MYSQL WEB DEVELOPMENT

Accessing Form Variables ....................................................................19

Form Variables ................................................................................19

String Concatenation ......................................................................20

Variables and Literals ......................................................................21

Identifiers ..............................................................................................21

User-Declared Variables ......................................................................22

Assigning Values to Variables ..............................................................22

Variable Types ......................................................................................22

PHP’s Data Types ............................................................................22

Type Strength ..................................................................................23

Type Casting ....................................................................................23

Variable Variables ............................................................................23

Constants ..............................................................................................24

Variable Scope ......................................................................................25

Operators ..............................................................................................25

Arithmetic Operators ......................................................................26

String Operators ..............................................................................27

Assignment Operators ....................................................................27

Comparison Operators ....................................................................29

Logical Operators ............................................................................30

Bitwise Operators ............................................................................31

Other Operators ..............................................................................32

Using Operators: Working Out the Form Totals ..................................33

Precedence and Associativity: Evaluating Expressions ........................34

Variable Functions ................................................................................36

Testing and Setting Variable Types ................................................36

Testing Variable Status ....................................................................37

Reinterpreting Variables ..................................................................37

Control Structures ................................................................................38

Making Decisions with Conditionals ..................................................38

if Statements ....................................................................................38

Code Blocks ....................................................................................38

A Side Note: Indenting Your Code ................................................39

else Statements ................................................................................39

elseif Statements ..............................................................................40

switch Statements ............................................................................41

Comparing the Different Conditionals ............................................42

Iteration: Repeating Actions ................................................................43

while Loops ....................................................................................44

for Loops ........................................................................................45

do..while Loops ..............................................................................46

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