Extracting JSONP Resultset in PHP
Introduction
The given task involves retrieving and parsing data from a URL that returns a JSONP (JSON with padding) response. PHP offers capabilities to handle such responses effectively.
PHP Implementation
The JSONP response consists of JavaScript code wrapped around a JSON payload. To extract the actual JSON, remove the callback function name and parentheses from the beginning of the response. Subsequently, the PHP function json_decode() can be utilized to parse the JSON into an associative array or an object.
Custom Function for JSONP Decoding
For convenience, a custom function named jsonp_decode() can be defined:
<code class="php">function jsonp_decode($jsonp, $assoc = false) { // PHP 5.3 adds depth as third parameter to json_decode
if($jsonp[0] !== '[' && $jsonp[0] !== '{') { // we have JSONP
$jsonp = substr($jsonp, strpos($jsonp, '('));
}
return json_decode(trim($jsonp,'();'), $assoc);
}</code>
Usage
Employing this custom function, the JSONP data can be extracted as follows:
<code class="php">$data = jsonp_decode($response);</code>
Example
Consider the example JSONP response provided:
YAHOO.Finance.SymbolSuggest.ssCallback({"ResultSet":{"Query":"yahoo","Result":[{"symbol":"YHOO","name": "Yahoo! Inc.","exch": "NMS","type": "S","exchDisp":"NASDAQ","typeDisp":"Equity"}...]}})
Using the jsonp_decode() function:
<code class="php">$data = jsonp_decode($response);
$query = $data['ResultSet']['Query'];
foreach ($data['ResultSet']['Result'] as $result) {
echo "Symbol: ".$result['symbol']." - Name: ".$result['name']." - Exchange: ".$result['exch']."\n";
}</code>
This code will extract the query string, along with the symbols, names, and exchange information from the JSONP response.
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