合并数组
例子1：

<?php
$msg = [
　　"code" => "0",
　　"msg" => "",
　　"count" => "",
];
$data = [
　　"name" => "lady",
　　"age" => "0",
　　"count" => "0",
];
$msg['data'] = $data;
print_r($msg);
 输出：

Array
(
　　[code] => 0
　　[msg] => 
　　[count] => 
　　[data] => Array
　　(
　　　　[name] => lady
　　　　[age] => 0
　　　　[count] => 0
　　)
)
例子二:

<?php
$a1 = [
    'red', 'green',
];
$a2 = [
    'blue', 'yellow',
];
print_r(array_merge($a1, $a2));
 输出：

Array
(
　　[0] => red
　　[1] => green
　　[2] => blue
　　[3] => yellow
)
例子三:

<?php
$a1 = [
    'apple' => 'red',
    'banner' => 'yellow',
];
$a2 = [
    'pear' => 'yellwo',
    'apple' => 'green',
];
$result = array_merge_recursive($a1, $a2);
print_r($result);
输出：

Array
(
    [apple] => Array
        (
            [0] => red
            [1] => green
        )
 
    [banner] => yellow
    [pear] => yellwo
)
例子四:

<?php
$a = array('color' => 'red');
$b = array('color' => 'blue', 'type' => 'fruit');
$arr = $a + $b;
print_r($arr);
输出：

Array
(
    [color] => red
    [type] => fruit
)
例子五:

<?php
$a = [
    [
        'id' => '1',
        'name' => '张三',
        'age' => '18',
    ],
    [
        'id' => '1',
        'name' => '小米',
        'age' => '15',
    ],
    [
        'id' => '3',
        'name' => '张三',
        'age' => '20',
    ],
    [
        'id' => '3',
        'name' => '张六',
        'age' => '29',
    ],
    [
        'id' => '3',
        'name' => '张三疯',
        'age' => '20',
    ],
];
$b = [];
foreach ($a as $k => $v) {
    if (!isset($b[$v['id']])) {
        $b[$v['id']] = $v;
    } else {
        $b[$v['id']]['name'] .= ',' . $v['name'];
    }
}
// echo '<pre>';
print_r(array_values($b));
 输出：

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => 张三,小米
            [age] => 18
        )
 
    [1] => Array
        (
            [id] => 3
            [name] => 张三,张六,张三疯
            [age] => 20
        )
 
)
 例子六：

<?php
$arr = array(
    array(
        'id' => 1,
        'pid' => 0,
        'name' => '新闻分类',
    ),
    array(
        'id' => 2,
        'pid' => 0,
        'name' => '最新公告',
    ),
    array(
        'id' => 3,
        'pid' => 1,
        'name' => '国内新闻',
    ),
    array(
        'id' => 4,
        'pid' => 1,
        'name' => '国际新闻',
    ),
    array(
        'id' => 5,
        'pid' => 0,
        'name' => '图片分类',
    ),
    array(
        'id' => 6,
        'pid' => 5,
        'name' => '新闻图片',
    ),
    array(
        'id' => 7,
        'pid' => 5,
        'name' => '其它图片',
    ),
);
 
//整理函数
/**
 * 生成无限级树算法
 * @author Baiyu 2014-04-01
 * @param array $arr        输入数组
 * @param number $pid        根级的pid
 * @param string $column_name    列名,id|pid父id的名字|children子数组的键名
 * @return array $ret
 */
function make_tree($arr, $pid = 0, $column_name = 'id|pid|children') {
    list($idname, $pidname, $cldname) = explode('|', $column_name);
    $ret = array();
    foreach ($arr as $k => $v) {
        if ($v[$pidname] == $pid) {
            $tmp = $arr[$k];
            unset($arr[$k]);
            $tmp[$cldname] = make_tree($arr, $v[$idname], $column_name);
            $ret[] = $tmp;
        }
    }
    return $ret;
}
$output_array = make_tree($arr);
print_r($output_array);
输出:

Array
(
    [0] => Array
        (
            [id] => 1
            [pid] => 0
            [name] => 新闻分类
            [children] => Array
                (
                    [0] => Array
                        (
                            [id] => 3
                            [pid] => 1
                            [name] => 国内新闻
                            [children] => Array
                                (
                                )
 
                        )
 
                    [1] => Array
                        (
                            [id] => 4
                            [pid] => 1
                            [name] => 国际新闻
                            [children] => Array
                                (
                                )
 
                        )
 
                )
 
        )
 
    [1] => Array
        (
            [id] => 2
            [pid] => 0
            [name] => 最新公告
            [children] => Array
                (
                )
 
        )
 
    [2] => Array
        (
            [id] => 5
            [pid] => 0
            [name] => 图片分类
            [children] => Array
                (
                    [0] => Array
                        (
                            [id] => 6
                            [pid] => 5
                            [name] => 新闻图片
                            [children] => Array
                                (
                                )
 
                        )
 
                    [1] => Array
                        (
                            [id] => 7
                            [pid] => 5
                            [name] => 其它图片
                            [children] => Array
                                (
                                )
 
                        )
 
                )
 
        )
 
)