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update value in mysql table

I would like to edit the old values in a table

$row=mysql_fetch_row($res); //get two values in a row from mysql

$value is obtain from $_GET['value'] and is used in the following form

<form action="renew.php?value='.$value.'" method="POST">
    Enter your value:  <br/>
    <input type="text" name="firstvalue" size="30" value="'.$row[0].'"/><br/>
    Enter another value:<br/>
    <textarea name="secondvalue" col="10">'.$row[1].'</textarea><br/>
    <input type="submit" value="Done!"/>
</form>

I'd like to post this form then renew the old values in mysql table with the new firstvalue and secondvalue. I'm stuck now.

In the renew.php I try this

$oldvalue=$_GET['value'];
print_r($oldvalue);
$newval1=$_POST['secondvalue'];
$newval2=$_POST['firstvalue']; // An unexpected syntax error for T_VARIABLE here

$query=sprintf("UPDATE tebo SET value1='%s',value2='%s' WHERE value1='%s' LIMIT 1",
               $newval1,$newval2,$oldvalue);
mysql_query($query) or die("Unable to update the specified data. ".mysql_error());
$oldvalue=$_GET['value'];

$newval1=$_POST['secondvalue'];
$newval2=$_POST['firstvalue']; 

$query="UPDATE tebo SET value1='".$newval1."',value2='".$newval2."' WHERE value='".$oldvalue."' ";
mysql_query($query) or die("Unable to update the specified data. ".mysql_error());

You forgot to put ; on bellow line

$newval1=$_POST['secondvalue'];
$newval2=$_POST['firstvalue']; 

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