search engine by name and surname - php

Question

I have created an auto suggestion search box using php and jquery. The user prompted to insert name and surname to find someone that exists in my database, in a table called user. Table users holds 2 columns, name and surname. My search works fine when you type the name but after pressing space to move and type surname does not give any results. The whole problem seems to appear when pressing space button. Any idea how to fix it?
This is my jquery code:
$(document).ready(function(){
$('#search_form_1').keyup(function(){
var value = $(this).val();
if(value != ''){
$('#search_result').show();
$.post('search_form.php', {value: value}, function(data){
$('#search_result').html(data);
});
}else{
$('#search_result').hide();
}
});
});
And this is my php code:
<?php
if(isset($_POST['value'])== true && empty($_POST['value']) == false){
$value = mysql_real_escape_string($_POST['value']);
$query = mysql_query(" SELECT `surname`, `name` FROM `users` WHERE (`surname` LIKE '$value%' OR `name` LIKE '$value%') OR (`name` LIKE '$value%' OR `surname` LIKE '$value%') ");
while($run = mysql_fetch_array($query)){
$surname = $run['surname'];
$name = $run['name'];
echo " $surname $name ";
}
}
?>

Answer 1

You have to split the search:
<?php
if(isset($_POST['value'])== true && empty($_POST['value']) == false){
$value = mysql_real_escape_string($_POST['value']);
$name_and_surname = explode(" ", $value);
$name = $name_and_surname[0];
$surname = $name_and_surname[1];
$q = " SELECT `surname`, `name` FROM `users` WHERE (`surname` LIKE '$name%' OR `name` LIKE '$name%') OR (`name` LIKE '$surname%' OR `surname` LIKE '$surname%') ";
// check your query one more time
echo $q;
$query = mysql_query($q);
while($run = mysql_fetch_array($query)){
$surname = $run['surname'];
$name = $run['name'];
echo " $surname $name ";
}
}

Answer 2

An edit is not granted so here is the code:
$value = mysql_real_escape_string($_POST['value']);
$names = explode(" ", $value);
if(count($names)>1){
$name = $names[0];
$surname = $names[1];
$q = "SELECT surname, name FROM users WHERE (name LIKE '$name%' AND surname LIKE '$surname%') OR (name LIKE '$surname%' AND surname LIKE '$name%')";
}else{
$q = "SELECT surname, name FROM users WHERE (name LIKE '$value%' OR surname LIKE '$value%')";
}

Answer 3

If you just want to amend the SQL query, you should just be able to do something like this.
select name, surname from users where CONCAT(name, ' ', surname) like '%value%'
That will take the first name and last name and put a space between them and then search that.
That means when your user hits the space bar it will still find the user you're looking for.