Use a php function in echo statement

[chris1990]

I've made this code, which disables a textbox if $TaxiDest has a value, however for my form to work i need this code to work [<?php phpfmg_hsc("field_17", ""); ?>] within the value tag of the textbox.

Here is the code im working with:

   
 <?php if($TaxiDest == "")
	{echo "<input type='text' name='field_17' id='field_17' value='phpfmg_hsc('field_17', '');' class='text_box'>";}
	else
	{echo "<input type='text' name='field_17' id='field_17' disabled='disabled' value='$TaxiDest' class='text_box'>";}
	?>

by the way when i run the page [phpfmg_hsc(] is displayed in the textbox
ive made a few changes but still not got it working heres a live link

Thanks in advance,
chris1990