mysql_num_fields Functions to get number of fields returned in a query

This old MySQL extension was deprecated in PHP 5.5.0 and was removed in PHP 7

Use mysqli_num_fields() in place of mysql_num_fields().

WE can get the number of fields in our executed query by using mysql_num_fields function. This function returns the number of fields returned by the query.

Here is an example

$query="select * from student";
$result=mysql_query($query);
$fields=mysql_num_fields($result);
echo $fields;

The above code will print 4 as we have 4 columns in our student table.

Now let us change the query a bit ( only query part is changed and all other parts remain same )

$query="select name,id from student";

Now the output of the print command will display 2 ( not 4 ). So the function mysql_num_fields function returns the number of columns returned by the query.

Read how mysql_num_fields() is along with mysql_field_name function is used to display all column names of a table.

Download sql dump of student table

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