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PHP Quiz PHP CertificatePHP mysqli_num_fields() Function
Example
Return the number of fields (columns) in a result set:
<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";
if ($result=mysqli_query($con,$sql))
{
// Return the number of fields in result set
$fieldcount=mysqli_num_fields($result);
printf("Result set has %d fields.\n",$fieldcount);
// Free result set
mysqli_free_result($result);
}
mysqli_close($con);
?>
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";
if ($result=mysqli_query($con,$sql))
{
// Return the number of fields in result set
$fieldcount=mysqli_num_fields($result);
printf("Result set has %d fields.\n",$fieldcount);
// Free result set
mysqli_free_result($result);
}
mysqli_close($con);
?>
Definition and Usage
The mysqli_num_fields() function returns the number of fields (columns) in a result set.
Syntax
mysqli_num_fields(result);
| Parameter | Description |
|---|---|
| result | Required. Specifies a result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() |
Technical Details
| Return Value: | Returns the number of fields in the result set |
|---|---|
| PHP Version: | 5+ |
PHP MySQLi Reference
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