Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP mysqli_num_fields() Function.
The mysqli_num_fields() function accepts a result object as a parameter, retrieves and returns the number of fields in the given object.
The mysqli_num_fields() function accepts a result object as a parameter, retrieves and returns the number of fields in the given object.
Syntax
Following below is the syntax to use this function -
mysqli_num_fields($result);
Parameter Details
Sr.No | Parameter & Description |
---|---|
1 | result(Mandatory) This is an identifier representing a result object. |
Return Value
This built-in function returns an integer value specifying the number of fields in the given result object.
PHP Version
This PHP function was first introduced in PHP version 5 and works in all the later versions.
Example1
The following below is an example which demonstrates the usage of the built-in PHP mysqli_num_fields() function (in a procedural style) -
<?php $con = mysqli_connect("localhost", "root", "password", "mydb"); mysqli_query($con, "CREATE TABLE myplayers(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))"); print("Table Created.....\n"); mysqli_query($con, "INSERT INTO myplayers values(1, 'Kennedy', 'Nkpara', 'PortHarcourt', 'Nigeria')"); mysqli_query($con, "INSERT INTO myplayers values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')"); mysqli_query($con, "INSERT INTO myplayers values(3, 'Queen', 'Douglas', 'Texas', 'UnitedStates')"); print("Record Inserted.....\n"); //Retrieving the contents of the table $result = mysqli_query($con, "SELECT * FROM myplayers"); //Number of fields $count = mysqli_num_fields($result); print("Number of fields in the result: ".$count); //Closing the statement mysqli_free_result($result); //Closing the connection mysqli_close($con); ?>
Output
When the above code is executed, it will produce the following result -
Table Created..... Record Inserted..... Number of fields in the result: 5
Example2
In an object oriented style the syntax of this function is $result->field_count(); Following is the example of this function in an object oriented style -
<?php //Creating a connection $con = new mysqli("localhost", "root", "password", "mydb"); $con -> query("CREATE TABLE Test(Name VARCHAR(255), AGE INT)"); $con -> query("insert into Test values('Kennedy', 27),('Paul', 30),('Justice', 28)"); print("Table Created.....\n"); $stmt = $con -> prepare( "SELECT * FROM Test WHERE Name in(?, ?)"); $stmt -> bind_param("ss", $name1, $name2); $name1 = 'Kennedy'; $name2 = 'Paul'; //Executing the statement $stmt->execute(); //Retrieving the result $result = $stmt->get_result(); //Number of fields $count = $result->field_count; print("Number of fields in the result: ".$count); //Closing the statement $stmt->close(); //Closing the connection $con->close(); ?>
Output
When the above code is executed, it will produce the following result -
Table Created..... Number of fields in the result: 2
Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the mysqli_num_rows() Function in PHP.
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