preview string with strlen PHP (help)

["Dwayne Heronimo" <dwayne@xxxxxxxxxxxxxxx>]

Dear All,

I am very new to programming. I want to make a preview text that would 
display only a part of the text that is a text field in a database.

//Begin Make preview string

 $minitxt = $row_show_cat['text'];
 $len = strlen($minitxt);

 if ($len > 235)
 {
  $len = 235;
 }
 else
 {
  $len = $len;
 }

 $newstring = substr($minitxt,0,$len);

 $previewtext = $newstring;

//End Make preview string

But if I want to display this somewhere in the page it will only display the 
first record of at every text column row <?php echo $previewstext ?>

Althought I am very new to php and programming. I thought maybe I should 
rewrite it into a function. But my function won't work.


function previewString($showcatvar) {

 $minitxt = $showcatvar;
 $len = strlen($minitxt);

 if ($len > 235)
 {
  $len = 235;
 }
 else
 {
  $len = $len;
 }

 $newstring = substr($minitxt,0,$len);

 $previewtext = $newstring;

 $previewtext = $whowcatvar;

}


and to display it in the page:

<?php echo  previewString($row_show_cat['text']) ?>

IT displays notthing. But I think I am doing somthing wrong. I am assigning 
the wrong variables to the $row_show_cat['text']) ???

Please let me know 

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