Ajax returns multiple data

Ajax returns multiple data, there are two ways

The first, custom delimited symbols, passing strings, such as using; splitting multiple variables, uploading to JS use; Split string array
Advantages: Fast, simple, convenient
Cons: Custom separators, which can cause unknown errors if the delimiter string used is also owned


The second, that is, a more secure method, PHP returns a JSON string, JS parsing an array, which is highlighted below
The PHP code returns a JSON string, converting the array of queries

$row =mysql_fetch_array (mysql_query ($sql)), if (Mysql_affected_rows () >0) echo Json_encode ($row);

Then JS to parse

A=eval (' ([' + msg + ']) '); alert (A[0].url);

Ajax returns multiple data