February 24, 2011 
Definition:
function wp_list_filter( $list, $args = array() {}
Filters a list of objects, based on a set of key => value arguments.
Parameters
- array $list: An array of objects to filter
- array $args: An array of key => value arguments to match against each object
- string $operator: The logical operation to perform: ‘AND’ means all elements from the array must match; ‘OR’ means only one element needs to match; ‘NOT’ means no elements may match. The default is ‘AND’.
Source code
function wp_list_filter( $list, $args = array(), $operator = 'AND' ) {
if ( ! is_array( $list ) )
return array();
if ( empty( $args ) )
return $list;
$operator = strtoupper( $operator );
$count = count( $args );
$filtered = array();
foreach ( $list as $key => $obj ) {
$to_match = (array) $obj;
$matched = 0;
foreach ( $args as $m_key => $m_value ) {
if ( $m_value == $to_match[ $m_key ] )
$matched++;
}
if ( ( 'AND' == $operator && $matched == $count )
|| ( 'OR' == $operator && $matched > 0 )
|| ( 'NOT' == $operator && 0 == $matched ) ) {
$filtered[$key] = $obj;
}
}
return $filtered;
}
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