making a search under this coding process - php

Question

this codes below came from my friend. i want to make a search under this codes . from this codes , it will display all the users to delete. what i want is i want to put search box and search button . so when i insert user id and press search only then it display which user that i want . where should i put this search text , button and php ? i want to put it under this else if codes . help me. im new :(
else if($_SESSION['jawatan'] == 'ADMIN') { ?>
<li> VIEW PROFILE </li>
<li> VIEW REQUEST </li>
<li>LOG OUT</li>
<li><img src="msc.jpg" width = "240" height ="80"></li>
<form method="get">
<input type="text" name="userid" placeholder="search" />
<inpu type="submit" value="Search" />
</form>
<h3>View User</h3>
<table border='1'>
<tr>
<td><b>#</b></td>
<td><b>Nama</b></td>
<td><b>Email</b></td>
<td><b>Division</b></td>
<td><b>Department</b></td>
<td><b>Delete</b></td>
</tr>
<?php
$i = 1;
$whr="";
if(isset($_GET['userid'])){
$whr.= " and mem_id='".$_GET['userid']."'"; // which field you want. If you want to do search name use LIKE instead =(equal to)
}
$result = mysql_query("SELECT * FROM members WHERE mem_role='USER' ".$whr);
if(mysql_num_rows($result)>0) {
while($row = mysql_fetch_array($result)) {
?>
<tr>
<td>
<?php echo $i; ?>
</td>
<td>
<?php echo $row['mem_name']; ?>
</td>
<td>
<?php echo $row['mem_email']; ?>
</td>
<td>
<?php echo $row['mem_division']; ?>
</td>
<td>
<?php echo $row['mem_department']; ?>
</td>
<td>Delete</td>
</tr>
<?php
$i++;
}
} else {
echo '<tr><td>No results found</td></tr>';
}
?>
</table>
<?php
}

Answer 1

HTML
<form method="get">
<input type="text" name="userid" placeholder="search" />
<inpu type="submit" value="Search" />
</form>
PHP
$whr="";
if(isset($_GET['userid'])){
$whr.= " and mem_id='".$_GET['userid']."'"; // which field you want. If you want to do search name use LIKE instead =(equal to)
}
MYSQL
$result = $result=mysql_query("SELECT * FROM members WHERE mem_role='USER' ".$whr);// add whr variable here

Answer 2

I can tell you the steps:
Create search text field and search button ( wrap in form if you want to do with php only)
on click of button ( that would be submit ), fetch that value from search text box and run query based on that
when results appear , fill the table data with that results using foreach.
hope it helps. Ask me for any issue.