Posts Tagged ‘PHP Database tutorial’


The WHERE clause is used to filter records.

The WHERE clause is used to extract only those records that fulfill a specified criterion.


SELECT column_name(s)
FROM table_name
WHERE column_name operator value

To get PHP to execute the statement above we must use the mysqli_query() function. This function is used to send a query or command to a MySQL connection.


The following example selects all rows from the "Persons" table where "FirstName='Peter'":

// Check connection
if (mysqli_connect_errno())
  echo "Failed to connect to MySQL: " . mysqli_connect_error();

$result = mysqli_query($con,"SELECT * FROM Persons
WHERE FirstName='Peter'");

while($row = mysqli_fetch_array($result))
  echo $row[‘FirstName’] . ” ” . $row[‘LastName’];
  echo "<br>";

The output of the code above will be:

Peter Griffin


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