The method of php returning json: 1. Set “header(‘Content-Type: application/json; charset=utf-8’);” in the php file; 2. Create “array(‘a’=>1,’b ‘=>2);”; 3. Just return the json data through “exit(json_encode($data));”.

How does PHP return json data?

PHP returns data in json, xml, JSONP and other formats

1. Return json data:

header('Content-Type:application/json; charset=utf-8');
$arr = array('a'=>1,'b'=>2);
exit(json_encode($data));

Note: If you directly output the value of json_encode without adding a header, the returned string is not an object, and js needs to convert it into an object by eval(‘(‘+data+’)’) first, and then get the value.

Return xml data:

header('Content-Type:text/xml; charset=utf-8');
exit($xml);

Return jsonp data:

$arr = array('a'=>1, 'b'=>2, 'c'=>3);
$json = json_encode($arr);
$callback = $_GET['callback'];
exit($callback."($json)");

Use count() for length

$sjson = json_decode($res);  
for($i=0;$i<count($sjson);$i++)
{ 
    echo $sjson[$i];
}