Implode data from a multi-dimensional array

问题:

I\'m a novice at PHP and I need a quick solution to the following problem but can\'t seem to come up with one:

I have a multi-dimensional array like so

Array
(
    [0] => Array
        (
            [blogTags_id] => 1
            [tag_name] => google
            [inserted_on] => 2013-05-22 09:51:34
            [inserted_by] => 2
        )

    [1] => Array
        (
            [blogTags_id] => 2
            [tag_name] => technology
            [inserted_on] => 2013-05-22 09:51:34
            [inserted_by] => 2
        )
)

I want to use the implode() to somehow return a comma-separated string containing values of tag_name key like so.

google, technology

Is it possible to achieve this effect with the said function? If not then please suggest an alternate solution.

回答1:

Quite simple:

$input = array(
  array(
    \'tag_name\' => \'google\'
  ),
  array(
    \'tag_name\' => \'technology\'
  )
);

echo implode(\', \', array_map(function ($entry) {
  return $entry[\'tag_name\'];
}, $input));

http://3v4l.org/ltBZ0

---

and new in php v5.5.0, array_column:

echo implode(\', \', array_column($input, \'tag_name\'));

回答2:

join(\',\', array_map(function (array $tag) { return $tag[\'tag_name\']; }, $array))

回答3:

array_map is a call back function, where you can play with the passed array. this should work.

$str = implode(\',\', array_map(function($el){ return $el[\'tag_id\']; }, $arr));

回答4:

Although this question is related to string conversion, I stumbled upon this while wanting an easy way to write arrays to my log files. If you just want the info, and don\'t care about the exact cleanliness of a string you might consider:

json_encode($array)

回答5:

very simple go for this

$str;
foreach ($arrays as $arr) {
$str .= $arr[\"tag_name\"] . \",\";
}
$str = trim($str, \',\');//removes the final comma 

回答6:

If you want \"tag_name\" with associated \"blogTags_id\" use: (PHP > 5.5)

$blogDatas = array_column($your_multi_dim_array, \'tag_name\', \'blogTags_id\');
echo implode(\', \', array_map(function ($k, $v) { return \"$k: $v\"; }, array_keys($blogDatas), array_values($blogDatas)));

回答7:

In this situation implode($array,\',\'); will works, becasue you want the values only. In PHP 5.6 working for me.

If you want to implode the keys and the values in one like :
blogTags_id: 1
tag_name: google

$toImplode=array();
foreach($array as $key => $value) {
$toImplode[]= \"$key: $value\".\'<br>\';
}
$imploded=implode(\'\',$toImplode);

Sorry, I understand wrong, becasue the title \"Implode data from a multi-dimensional array\". Well, my answer still answer it somehow, may help someone, so will not delete it.