用二维数组的某个元素做key

replace_array_key.php

<?php

/**
 * 用二维数组的某个元素做key
 */
function replace_array_key( $data, $field, $append = [] )
{
    $result = [];
    foreach ( (array)$data as $key => $val )
    {
        $append && $val = $val + $append;

        $result[ $val[$field] ] = $val;
    }

    return $result;
}