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<document><header><product>resin</product><title>Quercus JSON</title><description><p><b>JSON</b> (JavaScript Object Notation) is a popular text dataexchange format with built-in support from Quercus since Resin 3.0.20.One of the common uses of JSON in a PHP environment is for the serverto send JSON data to the user's browser. Because the JSON language isa subset of JavaScript, JSON-encoded text can be readily parsed on theuser's browser using JavaScript's <code>eval()</code> function.</p></description> <type>tutorial</type> <tutorial-startpage>json.html</tutorial-startpage></header><body><localtoc/><s1 title="Files in this tutorial"><deftable><tr> <td><viewfile-link file="json.html"/></td> <td>The JSON example page</td></tr><tr> <td><viewfile-link file="json.php"/></td> <td>The JSON PHP page</td></tr></deftable></s1><s1 title="Using JSON in Quercus"><p>Quercus has built-in JSON support and JSON functionality is enabled the moment Quercus is started: no additional downloads are required. Quercus sports two PHP functions for working with JSON: <i>json_encode</i> and <i>json_decode</i>.</p><example> <b>json_encode(mixed php_object)</b> encodes any PHP array or object into JSON. <b>json_decode(string json_string [, bool is_assoc])</b> decodes JSON into a PHP array or object.</example><p><i>json_decode</i> may return either a PHP array or object depending on the circumstances:</p><ul><li>If the text is that of a JSON <a href="http://www.json.org">array</a>,decoding returns a non-associative PHP array.</li><li>If the text is that of a JSON object and the second argument to <i>json_decode</i> is not specified or is <i>false</i>, decoding returns a standard PHP object.</li><li>If the text is that of a JSON object and the second argument to <i>json_decode</i> is <i>true</i>, then decoding returns an associative PHP array.</li></ul></s1><s1 title="Examples"><s2 title="json_encode"><p>To encode an array into JSON:</p><example> <?php $array = array("a"=>"Caucho", "b"=>"Resin", "c"=>"Quercus"); $json = json_encode($array); ?></example><p>The value of $json would be: <i>'{"a":"Caucho", "b":"Resin", "c":"Quercus"}'</i>.The JSON text may then be sent and used on the user's browser or to any client that can decode JSON.</p></s2><s2 title="json_decode"><p>To decode JSON data into a standard PHP object in Quercus (using the above JSON text <i>$json</i> as an example):</p><example> <?php $object = json_decode($json); ?></example><p><i>$object</i> would be a standard PHP object with three fields "a", "b", and "c" with values "Caucho", "Resin", and "Quercus" respectively.</p></s2><s2 title="Simple Web Example"><p>Below is a simple example using JSON on the web.</p><example> <script type="text/javascript"> <?php $array = array("a"=>"Caucho", "b"=>"Resin", "c"=>"Quercus"); $json = json_encode($array); echo "var data = $json;"; ?> var decoded = eval("(" + data + ")"); //Should output: "Quercus at work." document.write(decoded.c + " at work."); </script></example></s2><s2 title="AJAX Example"><p> JSON data is more commonly sent tothe browser via AJAX requests. Suppose there are two files definedbelow. The PHP script in <i>json.php</i> encodes an array into JSON.When the user's browser is directed to <i>json.html</i>, an AJAXrequest receives JSON data from <i>json.php</i>. Then the browsercalls <code>eval()</code> on the JSON data to recover a JavaScript object.</p><s3 title="json.php:"><example> <?php $array = array("a"=>"Caucho", "b"=>"Resin", "c"=>"Quercus"); $json = json_encode($array); echo $json; ?></example></s3><s3 title="json.html:"><example> <html> <head> <script type="text/javascript"> var url = "data.php"; function request() { if (window.XMLHttpRequest) http_request = new XMLHttpRequest(); else http_request = new ActiveXObject("Microsoft.XMLHTTP"); http_request.onreadystatechange = function() { handle_json(http_request) }; http_request.open("GET", url, true); http_request.send(null); } function handle_json(http_request) { if (http_request.readyState == 4) { document.firstForm.json.value = http_request.responseText; var decoded = eval("(" + http_request.responseText + ")"); document.firstForm.decoded.value = decoded.a + "'s " + decoded.b + " with " + decoded.c + " at work."; } } function clearForm() { document.firstForm.json.value = ""; document.firstForm.decoded.value = ""; } </script> </head> <body> <form name="firstForm"> <p>JSON:<br><textarea name="json" cols="50"></textarea></p> <p>Decoded:<br><textarea name="decoded" cols="50"></textarea></p> <input type="button" onclick="request()" value="AJAX Request"> <input type="button" onclick="clearForm()" value="Clear"> </form> </body> </html></example></s3></s2></s1><s1 title="External Links"><ul> <li> <a href="http://www.json.org">Official JSON Homepage</a> </li> <li> <a href="http://en.wikipedia.org/wiki/JSON">JSON Wikipedia entry</a> </li> <li> <a href="http://wiki.caucho.com/Quercus:_JSON">Caucho's JSON Wiki entry</a> </li> <li> <a href="http://www.aurore.net/projects/php-json">C Implementation from which Quercus' JSON syntax is based off of </a> </li></ul></s1></body></document>⌨️ 快捷键说明
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