Another way to 'unique column' an array, in this case an array of objects:
Keep the desired unique column values in a static array inside the callback function for array_filter.
Example:
<?php
class myObj {
public $id;
public $value;
function __construct( $id, $value ) {
$this->id = $id;
$this->value = $value;
}
}
function uniquecol( $obj ) {
static $idlist = array();
if ( in_array( $obj->id, $idlist ) )
return false;
$idlist[] = $obj->id;
return true;
}
$list = array( new myObj( 1, 1 ), new myObj( 2, 100 ) );
$list2 = array( new myObj( 1, 10 ), new myObj( 3, 100 ) );
$list3 = array_merge( $list, $list2 );
$unique = array_filter( $list3, 'uniquecol' );
print_r( $list3 );
print_r( $unique );
?>
In addition, use array_merge( $unique ) to reindex.
