[转]类与PHP（IV）

Classes and PHP
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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:
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<?php
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$Basic->TextOut('This is my test message');
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$Tbody->TextOut(' -- kinda neat, huh?');
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?>
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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 $Tbody is "bgcol" and that isn't used in this function. Notice the "&nbsp;" in the function declaration? That is there so if no message is passed the function will print out a non- breaking space. Why will become clear later on.
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So far we haven't saved a lot of work. The last example is easier if you want to change font color and/or size in the middle of a sentence but still doesn't justify writing an entire class. How about we add to the functions:
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<?php
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function TDOut ($message="&nbsp;",$colspan=1) {
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PRINT "<TD COLSPAN=$colspan BGCOLOR="$this->bgcol" ".
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"ALIGN="$this->align" VALIGN="$this->valign">";
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$this->TextOut($message);
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PRINT "</TD>n";
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}
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?>
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Now, we're getting somewhere! Remember, I wanted to have different background colors for my tables. Now I can do this:
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<TABLE>
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<TR>
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<?php
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$Theader->TDOut("Name",2);
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$Theader->TDOut("Location",3);
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?>
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</TR>
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<TR>
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<?php
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$Theader->TDOut("Last");
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$Theader->TDOut("First");
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$Theader->TDOut("City");
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$Theader->TDOut("State/Province");
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$Theader->TDOut("Country");
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?>
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</TR>
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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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