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@ 2017-05-29T13:19:47Z

<?php

$array = [
    [
        "FirstName" => "Tom",
        "LastName" => "Jones",
        "EmployeeID" => "123",
        "ManagerEmployeeID" => "",
        "Manager Name" => "",
    ],
    [
        "FirstName" => "Alice",
        "LastName" => "Wong",
        "EmployeeID" => "456",
        "ManagerEmployeeID" => "123",
        "Manager Name" => "Tom Jones",
    ],
    [
        "FirstName" => "Tommy",
        "LastName" => "J.",
        "EmployeeID" => "654",
        "ManagerEmployeeID" => "123",
        "Manager Name" => "Tom Jones",
    ],
    [
        "FirstName" => "Billy",
        "LastName" => "Bob",
        "EmployeeID" => "777",
        "ManagerEmployeeID" => "",
        "Manager Name" => "",
    ],
    [
        "FirstName" => "Rik",
        "LastName" => "A.",
        "EmployeeID" => "622",
        "ManagerEmployeeID" => "777",
        "Manager Name" => "Billy Bob",
    ],
    [
        "FirstName" => "Bob",
        "LastName" => "Small",
        "EmployeeID" => "111",
        "ManagerEmployeeID" => "622",
        "Manager Name" => "Rik A.",
    ],
    [
        "FirstName" => "Small",
        "LastName" => "Jones",
        "EmployeeID" => "098",
        "ManagerEmployeeID" => "622",
        "Manager Name" => "Rik A",
    ],
    [
        "FirstName" => "Eric",
        "LastName" => "C.",
        "EmployeeID" => "222",
        "ManagerEmployeeID" => "777",
        "Manager Name" => "Billy Bob",
    ]];

// print_r($array);

function getTreeData($data=[], $parent_key='', $self_key, &$new_array=[])
{
    if(!empty($data))
    {
        foreach($data as $d)
        {
            if(empty($new_array))
            {}
        }
        /*if(!empty($data[$parent_key]))
        {
            // $new_array[]
        }*/
    }
    else
    {
        return $data;
    }
}

getTreeData($array, "ManagerEmployeeID", "EmployeeID");

// $master_data;

Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Deprecated: Optional parameter $data declared before required parameter $self_key is implicitly treated as a required parameter in /in/tAMnc on line 63 Deprecated: Optional parameter $parent_key declared before required parameter $self_key is implicitly treated as a required parameter in /in/tAMnc on line 63
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Deprecated: Optional parameter $data declared before required parameter $self_key is implicitly treated as a required parameter in /in/tAMnc on line 63 Deprecated: Optional parameter $parent_key declared before required parameter $self_key is implicitly treated as a required parameter in /in/tAMnc on line 63
Output for 8.0.0 - 8.0.30: Deprecated: Required parameter $self_key follows optional parameter $data in /in/tAMnc on line 63
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33

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181.07 ms | 402 KiB | 171 Q