i need delay time in doing array_key_exists but while(true) can't work 4 it.

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===>if(array_key_exists('sub5',$_POST))
this line runs before i clicked on the submit
while(true) before this line can't work then how can i solve the time
problem?
here is the whole code:
<?php
session_start();

$connection=Mysql_connect('localhost','admin','123');
if(array_key_exists('sub3',$_POST))
{


if(!$connection)
{
echo 'connection is invalid';
}
else
{
Mysql_select_db('drugnet',$connection);
$query="select * from patient";
$result=mysql_query($query);
$num=Mysql_num_rows($result);
$num1=Mysql_num_fields($result);
}
if($num>0)
{
echo "<table border=2>";
for($i=0;$i<$num;$i++)
{
$row=mysql_fetch_row($result);
echo "<tr>";
for($j=0;$j<$num1;$j++)
{
echo"<td>$row[$j]</td>";
}
echo"<td><input type='submit' name='sub5' value='patient
file$row[0]'/></td>";
echo"</tr>";
}
echo"</table>";
}
}
if(array_key_exists('sub5',$_POST))
{
$_SESSION[s1]=$row[0];
header("Location: patient.php?");
}
?>
<html>
<head>
<title>Doctor</title>
<form method="post">
<input type="submit" name="sub3" value="patient list"/>
<input type="submit" name="sub4" value="search patient"/>

</form>
</head>
</html>

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