How to assign value to js array in php_javascript skills

Due to the requirements of the interface party, the data is processed in js, so the php program needs to retrieve the values ​​​​from the database and assign them to the js array. I haven't found a good way yet, because the data encoding of PHP arrays is different from the encoding format of JS arrays and cannot be output directly.

After searching online, I found the solution:

The PHP function library provides functions for encoding/decoding JSON: json_encode() and json_decode(), which can easily pass arrays or objects to JavaScript. Note: The JSON extension is only bound to PHP 5.2 and above.

Write the following in php:

Copy the code The code is as follows:

$arr = array('1',array('2','3'),array('new','old'));
$new_arr = json_encode($arr);//new_arr The output result is;["1",["2","3"],["new","old"]]
echo "var data =". $new_arr;

After referencing the above php file in the page, the data can be directly operated in js.