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[转]类与PHP（IV）
 
 
修改时间：[2009/09/04 10:15]    阅读次数：[925]    发表者：[起缘]
 
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 "&nbsp;" 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 ($message="&nbsp;",$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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