I want to make search with inner join table

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I want to make a search function in PHP and it from list that have been inner join with status approve. I can do the inner join but im not sure to do a search function from its.

What I have tried:

PHP

<!---this is my search form--->

 <div class="form-group">
                    <input class="form-control" id="keywords" name="keywords" type="text" placeholder=" " required data-validation-required-message="Please enter keywords">
                    <p class="help-block text-danger"></p>
                  </div>


 <div class="col-md-2">
                  <div class="form-group">
                    <button id="" class="btn btn-success btn-md text-uppercase" name="search" value="search" type="submit">Search</button>
                  </div>
                </div>
              </div>
				 <div class="col-xl-6 col-lg-7 col-md-12">
                <div class="body">
				<?php include 'studSearch.php'?>
	
			
      
                </div>  
<?php 
					include ('connection.php');
					
						
						$= "SELECT * FROM # INNER JOIN owner ON house.ownerNo=owner.ownerNo WHERE status ='APPROVE'";
						$result = mysqli_query($conn,$);
						
					
			
					
						if (x == TRUE) {
							$no = 1;
							while($row = mysqli_fetch_array(x)){
			?>

PHP

<!---search function that i try--->

<?php
		require 'connection.php';		
		$row = mysqli_query($conn, "SELECT * FROM `#` WHERE `property_type` LIKE '%$keywords%' ") or die(mysqli_error());
		while($result = mysqli_fetch_array($row)){
	?>

Posted 26-Jun-20 4:42am

Member 14871013

Updated 26-Jun-20 5:31am

v2

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OriginalGriff · Answer 1 · 2020-06-26T04:51:00

Not the problem you've noticed, but something much, much more important: Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

Which SQL sees as three separate commands:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';

A perfectly valid SELECT

SQL

DROP TABLE MyTable;

A perfectly valid "delete the table" command

SQL

--'

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?