Load PHP variables into a flash textbox

Please tell me one of you actionscripters can help me.
I have a file called content.php with the following code:

 $phpcontent1 = "I want this text to display in a flash text field";

Then I have a flash file with a text field that has both an instance name of “swfcontent1” & the variable name of “swfcontent1”. The first keyframe in my time has the following actionscript in it:

contentVars = new LoadVars();
txtbox1 = this.swfcontent1;

When I test my movie, my text box shows “_level0.swfcontent1” instead of the actual variable contents. Can anyone tell me why this is?