It keeps (echo)ing sth.
<?php
$offset=0;
if (isset( $_POST['text']) && isset( $_POST['search_for']) && isset($_POST['replace'])){
$text= $_POST['text'];
$replace= $_POST['replace'];
$search= $_POST['search_for'];
$string_length=strlen($search);
if (!empty ($text) && !empty($search) && !empty($replace)){
while ($strpos=strpos($text,$search,$offset))
echo $strpos.'<br>';
echo $offset=$strpos+$string_length.'<br>';
} else {
echo 'please fill all fields';
}
}
?>
<form action='index.php' method ='POST'>
<textarea name='text' rows=6 cols=30 > </textarea><br><br>
Search for:<br>
<input type ='text' name='search_for'><br><br>
Replace with:<br>
<input type='text' name='replace'><br><br>
<input type='submit' value='Find & Replace'>
</form>