PHP MySQL Where Clause

WHERE clause is used to filter the records.

WHERE clause

WHERE clause is used to extract records that meet the specified criteria.

grammar

SELECT column_name(s)
FROM table_name
WHERE column_name operator value

To learn more about SQL knowledge, please visit our SQL tutorial .

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

Examples

The following "Persons" table, select instances from all FirstName = 'Peter' line:

<?php
$con=mysqli_connect("localhost","username","password","database");
// 检测连接
if (mysqli_connect_errno())
{
	echo "连接失败: " . 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 code above will output:

Peter Griffin