An issue with the PHP array to the string

How to put an array such as the following

Array(    [0] => Array        (            [device_token] => Al9_G0i6ftf7fvkKsGM9o6jN5iyoqt8zTjcsh_kw6HUu        )    [1] => Array        (            [device_token] => AmfUS3qeXKrJt1K1ZTICiD-ED6a_YgM3GdBRp6gR4RgV        ))

Encapsulated into

"device_tokens":"device1,device2,…", 这种形式

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How to put an array such as the following

Array(    [0] => Array        (            [device_token] => Al9_G0i6ftf7fvkKsGM9o6jN5iyoqt8zTjcsh_kw6HUu        )    [1] => Array        (            [device_token] => AmfUS3qeXKrJt1K1ZTICiD-ED6a_YgM3GdBRp6gR4RgV        ))

Encapsulated into

"device_tokens":"device1,device2,…", 这种形式

$array = array(    array(        'device_token' => 'Al9_G0i6ftf7fvkKsGM9o6jN5iyoqt8zTjcsh_kw6HUu'    ),    array(        'device_token' => 'AmfUS3qeXKrJt1K1ZTICiD-ED6a_YgM3GdBRp6gR4RgV'    ));$result = [];array_walk_recursive($array, function ($value, $key) use (&$result) {    $result[$key][] = $value;});foreach ($result as $key => $value) {    $result[$key] = implode($value, ',');}$result = json_encode($result);// 如果你确定你不是想要json格式的话就保留下面$result = substr($result, 1, -1);

php5.5

$array = array(    array(        'device_token' => 'Al9_G0i6ftf7fvkKsGM9o6jN5iyoqt8zTjcsh_kw6HUu'    ),    array(        'device_token' => 'AmfUS3qeXKrJt1K1ZTICiD-ED6a_YgM3GdBRp6gR4RgV'    )); //如果字段不固定的话参考楼上$result = array_column($array,'device_token');

Json_encode (Array) JSON

$out=['devices'=>''];array_map(function($arr) use (&$out){  $value=array_values($arr)[0];  $out['devices'].=($out['devices'])?',':'';  $out['devices'].=$value;     },$array);print_r($out);

Array
(

[devices] => Al9_G0i6ftf7fvkKsGM9o6jN5iyoqt8zTjcsh_kw6HUu,AmfUS3qeXKrJt1K1ZTICiD-ED6a_YgM3GdBRp6gR4RgV

)

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