MySQL function giving wrong value - php

Question

I am creating a search engine whereby I require videos to be displayed according to the keywords input.
So for my codes, I have
$search_exploded = explode (" ", $search);
foreach($search_exploded as $search_each){
$x = 0;
$x++;
if($x>=1){
$construct ="keywords LIKE '%$search_each%'";
}
else{
$construct ="OR keywords LIKE '%$search_each%'";
}
$x = 0;
}
and
$query ="SELECT * FROM test WHERE $construct";
$runquery = mysql_query($query);
$foundnum = mysql_num_rows($runquery);
The problem lies in the $runquery as my the error i get from my browser states that the line $foundnum = mysql_num_rows($runquery); is returning a Boolean value instead of the supposed resource type value.
Can anyone help fix this? I'm stuck on this for quite some time now. Thankful for and appreciate any help!

Answer 1

there is a problem in if condition and every time you set $x to 0 , then why you init it.
$x = 0;
foreach($search_exploded as $search_each){
if($x==0){
$construct =" keywords LIKE '%$search_each%' ";
}else{
$construct .=" OR keywords LIKE '%$search_each%' ";
}
$x++;
}
Try this .

Answer 2

You have a couple of logical errors inside your foreach loop pertaining to the $x variable.
Here is a simple way to achieve what you are trying to do (without using some kind of flags like $x)-
$search_exploded = explode (" ", $search);
// An array for the `LIKE` conditions
$construct_list = [];
// Adding the conditions in the array
foreach($search_exploded as $search_each){
$construct_list[] = "keywords LIKE '%$search_each%'";
}
// Joining them using OR
$construct = implode(" OR ", $construct_list);
// Supposing there are no keywords, the
// WHERE should not exist. So make a separate var for that -
$where_clause = "";
if(trim($construct) != ""){
$where_clause = "WHERE $construct";
}
// Perform your query
$query ="SELECT * FROM test $where_clause";

Answer 3

Try this:
$search_exploded = explode (" ", $search);
$construct = '1';
if (!empty($search_exploded)) {
$construct = '';
foreach($search_exploded as $search_each){
$construct .= $construct == '' ? " keywords LIKE '%$search_each%'" : " OR keywords LIKE '%$search_each%'";
}
}
$query ="SELECT * FROM test WHERE $construct";
$runquery = mysql_query($query);
if ($runquery) {
$foundnum = mysql_num_rows($runquery);
}

Answer 4

You seem to try to omit the OR for the 2nd and subsequent runs around the loop, but keep it for the first. should be the other way round,.
But I would probably avoid using the loop, and just use implode. Something like this (although would need to escape the values before using them in the query).
$search_exploded = explode (" ", $search);
if (count($search_exploded) > 0)
{
$construct = implode("%' OR keywords LIKE '%", $search_exploded);
$query ="SELECT * FROM test WHERE keywords LIKE '%".$construct."%'";
$runquery = mysql_query($query);
$foundnum = mysql_num_rows($runquery);
}