What should I do if php cannot directly output an array?

php cannot output arrays directly because echo is used to output strings, not arrays. You can use "print_r($id)" to output an array or use "var_dump($id)" to view the array. Can.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

What should I do if php cannot directly output an array?

Specific question:

php array problem, why can’t the array be output?

$id = array();
$q = $db->query("select * from wp_files where userid='$userid' and is_del=1");
while ($rs = $db->fetch_array($q)) {
$id[] = $rs[file_id];
echo $rs[file_id];
echo $id;
}

Output $rs[uid] Normally $uid is Array

Output $rs[file_id] Normally $id is Array

Solution:

The array type created by $id

And echo is used to output strings

You can use print_r($id) to output an array

or use the commonly used var_dump($id) to see values ​​and data types.

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of What should I do if php cannot directly output an array?. For more information, please follow other related articles on the PHP Chinese website!