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get_root_node_by_leaf()

Description

Find node ID of the root parent when searching by one
of the leaves ID
Example:
1
2
2.1
2.2
2.2.1
2.2.2
2.2.3
2.3
3
Searching by "2.2.1" ID will give us the ID of node "2"

Parameters

ColumnTypeDefaultDescription
$ref integer Node ID of tree leaf
$level integer Node depth level (as returned by get_tree_node_level())

Return

integer|boolean

Location

include/node_functions.php lines 495 to 521

Definition

 
function get_root_node_by_leaf(int $ref, int $level)
    {
    if(0 >= $level)
        {
        return false;
        }

    $query = "SELECT n0.ref AS `value` FROM node AS n{$level}";

    $from_level = $level;
    $level--;

    while(0 <= $level)
        {
        $query .= " LEFT JOIN node AS n{$level} ON n" . ($level + 1) . ".parent = n{$level}.ref";

        if(0 === $level)
            {
            $query .= " WHERE n{$from_level}.ref = ?";
            $placeholders = ['i', $ref];
            }

        $level--;
        }

    return (int) ps_value($query, $placeholders, 0);
    }

This article was last updated 1st November 2023 15:05 Europe/London time based on the source file dated 17th October 2023 09:45 Europe/London time.