mysqli_num_rows()

$result_set->num_rows;
mysqli_num_rows($result_set)
The input parameter $result_set is the output of result set identifier of mysqli_query(), mysqli_store_result() or mysqli_use_result().

The output is number of rows present in the result set.

MySQLI database connection file

Example : Object Oriented Style
<?Php
require "config.php";// Database connection file.

$query="select * from student ";
if ($result_set = $connection->query($query)) {
echo "Total No. of records :".$result_set->num_rows;
    $result_set->close();
}?>
Total No. of records :35

MySQL SELECT Query

Procedural style
<?Php
require "config.php";// Database connection file.

$query="select * from student ";
if ($result_set = mysqli_query($connection,$query)) {
echo "Total No. of records :".mysqli_num_rows($result_set);
    mysqli_free_result($result_set);
}
?>
Total No. of records :35
With bind_param & using variables
$class='Three';
$query="select * from student WHERE class=? ";
$stmt=$connection->prepare($query);
$stmt->bind_param('s', $class); 
$stmt->execute();
$stmt->store_result();
echo "Total No. of records :".$stmt->num_rows;

Checking if matching record is available

$t="SELECT * FROM istudent where mark >90";

$check=$connection->query($t);
if(mysqli_num_rows($check)>0){
// record found 	
}else{
// No record found 	
}

MySQL DUMP of student table

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