PHP find another string in the string _php tips

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<form action= "<?echo $PHP _self;? > "method=" Post >
In <input type= "text" Name= "string" value= "<?echo $string;? > > Find <input type= "text" name= "query" value= "<?echo $query;? > "><br>
<input type= "Radio" Name= "where" value= "" <?if (!isset ($where) or $where = = "") echo "checked";? >> the second string can be at any position in the first string <br>
<input type= "Radio" Name= "where" value= "^" <?if (Isset ($where) and $where = = "^") echo "checked";? >> the first string starts with the second string <br>
<input type= "Radio" Name= "where" value= "$" <?if (Isset ($where) and $where = = "$") echo "checked";? >> the first string ends with the second string <br>
<input type= "checkbox" name= "case" value= "case" <?if (Isset ($case)) echo "checked";? >> Case Sensitive <br>
<input type= "Submit" value= "Query" >
</form>
?
if (Isset ($string) and Isset ($query) and $string <> "" and $query <> "") {
if (Isset ($case)) {
$func = "Ereg";
}
else{
$func = "Eregi";
}
Switch ($where) {
Case "^":
$query = "^". $query;
Break
Case "$":
$query. = "$";
Break
}
Eval ("$found = $func (" $query "," $string ");
if ($found) {
echo "Find it! ";
}
else{
echo "Not Found! ";
}
}
?>
</body>