转类与PHP （IV）

答案：Classes and PHP

This function will take a message passed in the argument and print it out in the appropriate style object. So to print a message we can: 

<?php 

$Basic->TextOut('This is my test message'); 
$Tbody->TextOut(' -- kinda neat, huh?'); 

?> 

Notice, there are no <BR> between the two function calls so they will print on the same line. Also, I just wanted a smaller font for the second part of the output and I had already declared that in $Tbody so I used that. This is safe in this instance as the only other difference between $Basic and $Tbody is "bgcol" and that isn't used in this function. Notice the " " in the function declaration? That is there so if no message is passed the function will print out a non- breaking space. Why will become clear later on. 

So far we haven't saved a lot of work. The last example is easier if you want to change font color and/or size in the middle of a sentence but still doesn't justify writing an entire class. How about we add to the functions: 

<?php 

function TDOut ($message=" ",$colspan=1) { 

        PRINT "<TD COLSPAN=$colspan BGCOLOR=\"$this->bgcol\" ". 
                "ALIGN=\"$this->align\" VALIGN=\"$this->valign\">"; 
        $this->TextOut($message); 
        PRINT "</TD>\n"; 

} 

?> 

Now, we're getting somewhere! Remember, I wanted to have different background colors for my tables. Now I can do this: 

<TABLE> 
<TR> 
<?php 

$Theader->TDOut("Name",2); 
$Theader->TDOut("Location",3); 

?> 
</TR> 
<TR> 
<?php 

$Theader->TDOut("Last"); 
$Theader->TDOut("First"); 
$Theader->TDOut("City"); 
$Theader->TDOut("State/Province"); 
$Theader->TDOut("Country"); 

?> 
</TR> 

There. See how the colspan argument works. If it's not declared it defaults to 1. So in the first table row "Name" spans 2 columns and "Location" spans 3. In the second row all of them cover a single column. 

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