PHP empty function to determine if MySQL form is empty _php tutorial

Values to be judged.
Very simple, give an example.
method One:
Copy CodeThe code is as follows:
$sql = "SELECT * Form ABC"
$result = mysql_query ($sql);
$row = Mysql_fetch_array ($result);
if (empty ($row))//Start judging is enough empty
{
echo "NULL";
}
Else
{
echo "NOT NULL";
}

Method Two:
Copy CodeThe code is as follows:
$sql = "SELECT * Form ABC"
$result = mysql_query ($sql);
$row = Mysql_fetch_array ($result);
if (! $row)//Start Judging is enough for empty
{
echo "NULL";
}
Else
{
echo "NOT NULL";
}

In fact, when the Mysql_fetch_array function is used when the table is empty table, it will return false, this time $row naturally did not assign

The value succeeds.
Remember, never dare to use $row = Mysql_fetch_array ($result) or Die (Mysql_error ());
If the following yo or die, then the program execution to Mysql_fetch_array will terminate execution.

http://www.bkjia.com/PHPjc/321560.html www.bkjia.com true http://www.bkjia.com/PHPjc/321560.html techarticle values to be judged. Very simple, give an example. Method One: Copy the code as follows: $sql = "SELECT * Form abc" $result = mysql_query ($sql); $row = mysql_fetch_array ($resul ...

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