json_decode失败

Question

I have the following JSON formatted string:

{

"hooks":[
        {
        "type":"subscribe",
        "id":1331741592.6925,
        "email":"JoeX@test-email.com",
        "status":"Active",
        "custom_fields":"{\"first_name\":\"Joe\",\"last_name\":\"X\"}",
        "ip_created":"24.199.200.142",
        "list_id":"33",
        "list_type":"internal",
        "list_name":"Administrator List 2",
        "list_optin":false
        },
        {
        "type":"subscribe",
        "id":1331741592.7067,
        "email":"JaneY@test-email.com",
        "status":"Active",
        "custom_fields":"{\"first_name\": \"Jane\",\"last_name\":\"Y\"}",
        "ip_created":"24.199.200.142",
        "list_id":"33",
        "list_type":"internal",
        "list_name":"Administrator List 2",
        "list_optin":false
        }
    ]

}

I want to use the PHP json_decode() function to put it in an associative array.

When I do run the script, debugging shows the value of the new array as null , so I presume the decode is failing. We aren't running PHP 5.3, so I can't use json_last_error() . Here is the code:

$hooks = (the JSON string from above);
$hooksArray = json_decode($hooks, true);

Any ideas why the $hooksArray is coming back null ?

Answer 1

Is the JSON string inside your PHP source? Perhaps it's not interpreting the escaped backslashes correctly.

I tried the following experiment in Python for reference: Dumped the JSON data into a multi-line string via the REPL and decode it with json.loads(). It choked on the in-string quotes in the first instance of the custom_fields string. When I examined the multi-line string, all the escapes were gone, leaving me only with the quotes.

When I put the same JSON data in an external file and loaded it, it worked fine.

I put the JSON data in an external file and replaced all '\\"' instances with '\\\\"' and then the first experiment started to work.

Maybe that will work for you too.