Page 227 - Beginning PHP 5.3

Chapter 8: Objects

echo “ < p > The string in uppercase letters is: “ . $myString- > strtoupper() .
“ < /p > ”;
echo “ < p > The letter ‘e’ occurs at position: “ . $myString- > strpos( “e” ) .
“ < /p > ”;
$myString- > madeUpMethod();

? >

< /body >
< /html >
When run, the script produces the output shown in Figure 8 - 4 .

Figure 8 - 4

H ow I t W orks
The CleverString class serves two purposes: it stores a string to be operated on, and it provides
method - based access to three built - in string functions that operate on the stored string:
❑ strlen() for calculating the length of the string
❑ strtoupper() for converting the string to uppercase letters
❑ strpos() for finding the position of the first occurrence of a character in the string
As mentioned earlier, it ’ s good practice to encapsulate the members of a class as much as possible in
order to make the class robust and maintainable. To this end, the stored string is encapsulated in a
private property, $_theString ; calling code can use the public methods setString() and
getString() to set and read the string value.

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