mysql_fetch_array is a PHP function that will allow you to access data stored in the result returned from the TRUE mysql_query if u want to know what is returned when you used the mysql_query function to query a Mysql database. It is not something that you can directly manipulate. Syntax.
What is the purpose of using mysql_fetch_array () & Mysqli_num_rows ()?
The purpose of using the functions mysql_fetch_array() and mysqli_num_rows() is to extract data from a database. mysql_fetch_array() is used to retrieve a row from a database query and store it as an array. This allows for the values to be referenced by the column name, such as name or id. mysqli_num_rows() is used to count the number of rows returned from a database query. This allows for the programmer to determine how many results have been returned, and to loop through them or take other actions depending on the data. Together, these two functions can be used to accurately and efficiently access data stored in a database.
What is the difference between mysql_fetch_array () and Mysql_fetch_assoc ()?
MySQL_fetch_array() and MySQL_fetch_assoc() are functions used in PHP programming language to fetch data from a database.
The main difference between MySQL_fetch_array() and MySQL_fetch_assoc() is that MySQL_fetch_array() returns both the numerical index and associated array. So when you run MySQL_fetch_array(), it will create an array containing both numerical and associated key-value pairs. On the other hand, MySQL_fetch_assoc() will only return the associated array with only the key-value pairs. It will not return the numerical index with the values.
Another notable difference between these two functions is that MySQL_fetch_ array() is faster than MySQL_fetch_assoc(). This is due to the fact that MySQL_fetch_array() only needs to process the numerical index, resulting in faster processing time. Additionally, MySQL_fetch_assoc() requires extra steps to filter out the numerical index from the returned array.
Finally, one more difference between MySQL_fetch_array() and MySQL_fetch_assoc() is that MySQL_fetch_array() allows the programmer to access both the numerical index and associated key-value pair while MySQL_fetch_assoc() only allows access to the associated key-value pair.
What does mysql_fetch_row function do?
The MySQL Fetch Row function is a part of the PHP extension for MySQL. It retrieves a result row from a result set as an array. It returns an array of strings or an associative array, depending on the query, containing the values of all the columns of the specific row. This function is often used when you need to iterate through the rows of a result set, which is common when accessing data from a database. A typical example might be retrieving a list of products or customers. By using the MySQL Fetch Row function, you can store each row in an array and then iterate through the array to display each of the values. It is important to note that the function will only return the first row of data, so if you need to iterate through all the rows of a result set you will need to call the function multiple times.
What is the use of Mysql_fetch_assoc () function?
The MySQL_fetch_assoc() function is used in PHP to access data stored in a MySQL database. It retrieves a row from a result set as an associative array, which can then be used to access the data stored in each field of the row. This function is especially useful when you want to access a specific data field from a larger result set. By assigning the output of the MySQL_fetch_assoc() function to a PHP variable, the various fields can be accessed using the array’s keys, thus making the data much easier to access and manipulate.
How to use mysql_fetch_array in PHP?
The mysql_fetch_array() function in PHP is used to fetch a result row from a database query as an associative array, a numeric array, or both. It returns a result set either as an array in the form of an associative array with the keys being the column names, or as a numeric array, with the column indices starting at 0.
When using the mysql_fetch_array() function, you must specify which type of result array you want to receive. You can do this by passing either the MYSQL_ASSOC, MYSQL_NUM or MYSQL_BOTH constant as the second argument of the mysql_fetch_array() function.
Let’s look at how it works with an example. Let’s say we have a database table called ‘users’ and we want to retrieve all its contents using the mysql_fetch_array() function:
$result = mysql_query(“SELECT * FROM users”);
while ($row = mysql_fetch_array($result, MYSQL_ASSOC))
{
echo $row[‘name’] .’ ‘ . $row[’email’];
}
In the above example, we are using the mysql_fetch_array() function to retrieve each row of our ‘users’ table and assign it to the array $row. The MYSQL_ASSOC constant ensures that the result array is in the form of an associative array, with the keys being the column names.
We can then use the keys of the array to access the values, as seen in the example above where we have echo’ed out the ‘name’ and ’email’ columns.
Using the mysql_fetch_array() function is a great way to quickly and easily retrieve data from a database query, as it is easy to understand and use.
