create a genealogy tree in php

To create a genealogy tree in PHP, you can use a graph-based approach. Each person can be represented as a node in the graph, and relationships between people can be represented as edges between their respective nodes.

To start, you'll need a data structure to represent each person and their relationships. You could use an array to represent each person, with fields for their name, birth/death dates, and parent/child relationships:


main.php
$john = array(
    "name" => "John Smith",
    "birth_date" => "January 1, 1900",
    "death_date" => "December 31, 1990",
    "parents" => array(),
    "children" => array()
);

$jane = array(
    "name" => "Jane Smith",
    "birth_date" => "February 2, 1920",
    "death_date" => "November 30, 2010",
    "parents" => array(),
    "children" => array()
);

// ... add more people as needed
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Once you've defined your data structure, you can start building the graph. One way to do this is to create an array of nodes, where each node is represented by a key-value pair of the person's name and their data:


main.php
$nodes = array(
    "John Smith" => $john,
    "Jane Smith" => $jane
    // ... add more nodes here
);
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Next, you'll need to define the relationships between nodes. To do this, you can add edges between nodes using their parent/child relationships:


main.php
// define John's parents
$john["parents"] = array(
    "father" => "Adam Smith",
    "mother" => "Eve Smith"
);

// define Jane's parents
$jane["parents"] = array(
    "father" => "John Smith",
    "mother" => "Mary Johnson"
);

// add John and Jane as children of their respective parents
$nodes["Adam Smith"]["children"][] = "John Smith";
$nodes["Eve Smith"]["children"][] = "John Smith";

$nodes["John Smith"]["children"][] = "Jane Smith";
$nodes["Mary Johnson"]["children"][] = "Jane Smith";
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Once you've defined all the relationships between nodes, you can render the graph as a tree using a recursive function that traverses the graph and outputs each node as a branch in the tree:


main.php
function render_tree($node, $depth) {
    // output the current node
    echo str_repeat("-", $depth) . $node["name"] . "\n";
    
    // recursively output each child node as a subtree
    foreach ($node["children"] as $child_name) {
        $child_node = $nodes[$child_name];
        render_tree($child_node, $depth + 1);
    }
}

// render the tree starting from the root node
render_tree($john, 0);
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This should output a text-based tree representation of the graph:


main.php
John Smith
--Jane Smith
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Of course, this is a very simple example, and in real-world scenarios you'll likely have many more nodes and complex relationships to represent. But the basic approach of using a graph data structure and recursively traversing it to render a tree should still apply.

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