Too similar to "==". When you use a boolean for parameter with mysqli_num_rows, a warning will be generated because the function expects a resource. But the only difference is !empty() function will not generate any warning or e-notice when the variable does not exists. I feel like I write this part of code a lot and sometimes I get errors, and sometimes I don't. Thanks to Marc B's help, here's what worked for me (note: Marc's rowCount() suggestion could work too, but I wasn't comfortable with the possibility of it not working on a different DB or if something changed in mine... also, his select count(*) suggestion would work too, but, I figured because I'd end up getting the data if it existed anyways, so I went this way), successful - php mysqli query check if empty. This would exist in the QVOTES table, … Join Stack Overflow to learn, share knowledge, and build your career. How to output MySQL query results in CSV format? Then most of us convert it to array for looping through the rows easily. I use not in because u need to check all pages instead of 1 of the page. Didn’t realize you could check the num_rows just from the query handle Duh. What is more logical then testing the TYPE of the result variable before processing? The second is the best way if its a "SELECT *" the last is only useful if you have a SELECT COUNT(*) or other aggregated function. Why are non-folding tyres still manufactured? In DB I have a table with a field called fk_ownerID. Either PGSQL_STATUS_LONG to return the numeric status of the result, or PGSQL_STATUS_STRING to return the command tag of the result. if (mysql_num_rows($result)==0) { PERFORM ACTION }. Using this method to fetch large result sets will result in a heavy demand on system and possibly network resources. How do you parse and process HTML/XML in PHP? How to check if PHP array is associative or sequential? In php "empty ()" function is used to check if an array is empty i.e. Foreach-ing Through Mysql Query Returning Null :s . I use the isset function to test if a select statement worked: Of course this is only for a single result, as you might have when looping over a dataset. Sometimes, we need to check whether the data is existing or not before inserting a new one. When it checks to see if the group exists, however, and the table is empty, it always returns an error, which disables the script that calls the function. But the problem is, those function arguments are user-submitted form data, meaning the solution is vulnerable to SQL Injection. why {if row exist then fetch them} does not work? Why shouldn't I use mysql_* functions in PHP. If fk_ownerID is given a value, and I later remove this value, I set fk_ownerID = "". This would not belong in the PHP forum, but rather in one of the database forums. So far i have just been sending it to another JFrame that displays it in a JTable. Php Handle Mysqli Query Functie Check… Tested in PHP 5.2.9-2 and PHP 5.2.17 But please for sanity sakes, use PDO :-). if it has no data in it. Let me know if it should be somewhere else please. Where does the term "second wind" come from? Logic/reality Check Before Writing Query. MySQL check if a table exists without throwing an exception, Best way to test if a row exists in a MySQL table, mysql: works ok in console, in php will not access data. If you’re just wanting to get a single row, call the fetch method and then check to see if the return value is empty: It still a valid method to check the O/P question: I'm looking for the best way to check and see if any results were returned in a query. I have experimented with this with little results save for errors. An empty array is returned if there are zero results to fetch, or false on failure. query: Required. 3 min read If you are building a RESTful API in PHP, then you are most likely using the json_encode function. 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