Query whether there are the same values ​​in the database

$result = $this->result_row($query);
The $this->result_row() method here was written by me.
Too lazy to write methods for executing QUERY and detecting the number of results.
If you don’t know how to write a message or just go to PHP’s mysql tutorial
www.w3school.com.cn
A very good website....^_^

:::Usage:::
$user = $_POST['user'];
if(CheckVal('member','user',$user)){
echo 'Sorry, username already exists! ';
}
Check whether the value in the user field of the member table is the same as the value passed by POST
I use it personally. If there is a better method, I would recommend one. Hehe...

function CheckVal($table,$field,$value){
 $value = (is_numeric($value)) ? $value : "'".$value."'" ;
 $ query = 'SELECT * FROM '.$table.' WHERE '.$field.'='.$value;
 $result = $this->result_row($query);
 return ($result > 0) ? true : false;
}
?>