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print out value from a submit form


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Hello; :) I tried to print out some value which from a submit form, but i could not, could you tell me why, please.

<html><body>	   <ceneter>	  <form action="submitR.php" method="post">		  User Name:		  <input type="text" name="UserName" maxlength=2><br>		 		  Topic:		  <input type="text" name="Topic" maxlength=2> <br>		  Content:<br>		  <TEXTAREA name="content" clos=50 rows=10 onkeyup="this.value = this.value.slice(0, 200)"></TEXTAREA>		  <br>		  <INPUT type="submit" value="submit"> <INPUT type="reset">		  </form>		 </ceneter>		  </body></html>

in the submitR.php file<?echo "$REQUEST_['topic']";echo "$REQUEST_['content']";echo "$REQUEST_['username']";?>

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Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive.
so, change variable names to
<?echo $_REQUEST["UserName"];echo $_REQUEST["Topic"];echo $_REQUEST["content"];?>

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