MS Access & php - php

Question

What is the correct condition for the if statement in the code below
$sql = "INSERT INTO table ($columns) VALUES ($values)";
echo $sql;
$results = odbc_exec($conn, $sql);
if ($results){
echo "Query Executed";
}else {
echo "Query failed " .odbc_error();
}
or should it be
if ($results > 0){
Please advise.

Answer 1

From the manual: http://php.net/manual/en/function.odbc-exec.php
Returns an ODBC result identifier if the SQL command was executed
successfully, or FALSE on error.
So checking for a $result is OK:
<?php
...
$result = odbc_exec($conn, $sql);
if ($result) {
// OK
} else {
// Failure
}

Answer 2

The correct way to test odbc_exec() for success or failure is:
if ($result !== false) {
// success
} else {
// failure
}
The documentation says:
Returns an ODBC result identifier if the SQL command was executed successfully, or FALSE on error.
If a function returns a boolean (FALSE) or non-boolean values, be sure to use the identity comparison operator.
While if ($result) may work in this case (it depends on possible ODBC result identifiers), it will not work in other cases.
For example, strpos() returns FALSE if the substring is not found and the position of the substring otherwise - that means 0 is a positive result.
if ($result) would be wrong in this case while if ($result !== FALSE) will work as expected.