Searching in a text file

[ShadowWolf]

Ok, I have a php file which insert in a txt file values entered by a user through some forms. What I need to do now is to perform a search through this text file and come up with every string that matches the results.
Example:
Text File Content

Daniel Shepard 23 Abbey Road London Student
Mike Harris 43 Downing Street London Bricklayer
Diane Mulder 32 Downing Street London Teacher

If I write Downing Street in the search form it should give me

Mike Harris 43 Downing Street London Bricklayer
Diane Mulder 32 Downing Street London Teacher

What Can I Do? I tried to read documentation on php.net, but I didn't come up with the soluton. Thanks in Advance.

[dagon]

forget about a txt file, this is a job for a database.

[djjjozsi]

If you use files takes like this: (down you can see how to do it with mysql database...)

<?

$handle = @fopen("file.txt", "r");
if ($handle) {
    while (!feof($handle)) 
{
	$found=0;

    $buffer = fgets($handle, 4096);


$str=explode(" ",$_POST["textfield"]);

foreach($str AS $s)
{

	$buffer=str_replace($s,"<b>{$s}</b>",$buffer);

	if( strstr(strtolower($buffer),strtolower($s)))
	{

	$found=1;
	}

}

if($found==1)
{
	$o++;
	print "$o: $buffer<br>";
}

}
fclose($handle);
if($o==0)
print "No result";
}


?>
<form name="form1" method="post" action="">
  <input type="text" name="textfield">
  <input type="submit" name="Submit" value="Submit">
</form>

With mysql:

<?
include("connec_to_Database.php");

if(isset($_POST["textfield"]))
{
  $search=mysql_real_escape_string($_POST["textfield"]);
  $sql="SELECT * FROM table WHERE tag_field LIKE '%$search%'";
  $result=mysql_query($sql);
  if(mysql_num_rows($result)>0)
  {
  $i=1;
    while($rows=mysql_fetch_assoc($result))
    {
      extract($rows);
      print "$i: Name: $name , Address: $address , Profession: $profession<br>";
      $i++;
    }
  $i++;
  }
  else
  print "No result";

}

?>
<form name="form1" method="post" action="?">
  <input type="text" name="textfield">
  <input type="submit" name="Submit" value="Submit">
</form>