Search Form Multi Input - php

Question

I have a search form with 2 select fields and one input, total 3 options, so i created some if statements, depending of each fields are set it haves is own query, but its not working well, is all buggy, the results doesn't get right, it gets mixed up with the statements queries, it's not getting right.
Here is my code for the search form result:
$keywords = $_GET["Keywords"];
$location = $_GET['Location'];
$jobtype = $_GET["Category"];
if (isset($location) && empty($jobtype) && empty($keywords)){
$sql_jobs = "SELECT * FROM jobs
WHERE
active = '1' AND
country = '$location'
ORDER BY id_job DESC";
}elseif(isset($location) && isset($jobtype) && empty($keywords)){
$sql_jobs = "SELECT * FROM jobs
WHERE
active = '1' AND
country = '$location' AND
jobType_en = '$jobtype'
ORDER BY id_job DESC";
}elseif(isset($location) && isset($jobtype) && isset($keywords)){
$sql_jobs = "SELECT * FROM jobs
WHERE
active = '1' AND
country = '$location' AND
jobType_en = '$jobtype' AND
title_en LIKE '%$keywords%'
ORDER BY id_job DESC";
}elseif(empty($location) && isset($jobtype) && empty($keywords)){
$sql_jobs = "SELECT * FROM jobs
WHERE
active = '1' AND
jobType_en = '$jobtype'
ORDER BY id_job DESC";
}elseif(empty($location) && isset($jobtype) && isset($keywords)){
$sql_jobs = "SELECT * FROM jobs
WHERE
active = '1' AND
jobType_en = '$jobtype' AND
title_en LIKE '%$keywords%'
ORDER BY id_job DESC";
}elseif(empty($location) && isset($jobtype) && isset($keywords)){
$sql_jobs = "SELECT * FROM jobs
WHERE
active = '1' AND
jobType_en = '$jobtype' AND
title_en LIKE '%$keywords%'
ORDER BY id_job DESC";
}
else{
$sql_jobs = "SELECT * FROM jobs
WHERE
active = '1'
ORDER BY id_job DESC";
}
$consultaJob = mysql_query($sql_jobs);

Answer 1

You need to simplify the code:
$sql = "SELECT * FROM jobs
WHERE
active = '1' AND
country = '$location' ";
$order = "ORDER BY id_job DESC";
$where = "";
if( isset( $jobtype ) { $where .= " AND jobType_en = '$jobtype'"; }
if( isset($keywords) { $where .= " AND title_en LIKE '%$keywords%'" };
$sqlx = $sql . $where . $order;
You are obviously processing $jobtype and $keywords earlier on. In this processing you should be setting some default values to make later processing easier.
$jobtitle = (isset( $_GET['jobtitle'] ) ) ? $_GET['jobtitle'] : "";
$keywords= (isset( $_GET['keywords'] ) ) ? $_GET['keywords'] : "";
This way you can use:
if( $jobtitle != '') { .... }

Answer 2

You may want to try strlen() rather than isset or empty
otherwise you have to use both isset() and empty()
empty() does not generate a warning if the variable does not exist.
strlen() will return zero on NULL and ''.
You can set minimum lengths by changing the zero to a higher value.
elseif(strlen($location) > 0 && strlen($jobtype) > 0 && strlen($keywords) > 0 ){
If the submitted values are text inputs then you may need the trim also:
elseif(strlen(trim($location)) > 0 && strlen(trim($jobtype)) > 0 && strlen(trim($keywords)) > 0 ){