#$wpdb foreach - PHP

$wpdb is a powerful PHP library that is used to interact with WordPress database. It provides us with a range of functions that makes it easy to query, insert, update and manage data in the WordPress database.

One of the useful functions in $wpdb is the foreach loop. This loop can be used to iterate over a set of records returned by a database query. It is especially useful when we want to perform a certain action on each record.

Here's an example of how to use $wpdb foreach loop:

global $wpdb;

$my_table = $wpdb->prefix . 'my_table';

$results = $wpdb->get_results( "SELECT * FROM $my_table" );

if ( !empty( $results ) ) {
  foreach ( $results as $result ) {
    // Perform some action on each record
  }
}

In the example above, we use $wpdb->get_results() function to query records from the my_table table, and then loop over each record using the foreach loop. You can use this loop to perform any action you want to each record.

It is important to note that $wpdb foreach loop should always be wrapped in a conditional statement to handle situations where there are no records returned by the query.

In summary, $wpdb foreach loop is a powerful feature in $wpdb library that makes it easy to iterate over a set of records returned by a database query. It can be used to perform any action on each record and can greatly simplify database operations in WordPress.

Example

global $wpdb;

// set the table name in database
$test_table_name = $wpdb->prefix . 'test_table';

//get all records from table 
$all_records = $wpdb->get_results("SELECT * FROM $test_table_name");

//perform some action on each record
if(!empty($all_records)){
    foreach($all_records as $record){
        //do something
    }
}