Test

Bisa gini :
<form method="POST">
    <input type="text" name="keyword" value="<?php echo isset($k)?$k:"" ?>">
    <input type="submit" name="search" value="search">
    <input type="submit" name="delete" value="delete"><br><br>
    <input type="text" name="keyword1" value=""><br><br>
    <input type="text" name="keyword2" value=""><br><br>
    <input type="text" name="keyword3" value=""><br><br>
    <input type="submit" name="insert" value="insert">
</form>

Bisa gini (ternary if):
<form method="POST">
    <input type="text" name="keyword" value="<?php echo isset($k)?$k:"" ?>">
    <input type="submit" name="search" value="search">
    <input type="submit" name="delete" value="delete"><br><br>
    <input type="text" name="keyword1" value=""><br><br>
    <input type="text" name="keyword2" value="<?php echo isset($nama)?$nama:"" ?>"><br><br>
    <input type="text" name="keyword3" value="<?php echo isset($jabatan)?$jabatan:"" ?>"><br><br>
    <input type="submit" name="insert" value="insert">
</form>