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Use of HTTP POST With PHP json_decode

Example
obj = { "table":"customers""limit":10 };
dbParam = JSON.stringify(obj);
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        newObj = JSON.parse(this.responseText);
        for (x in newObj) {
            txt += newObj[x].name + "<br>";
        }
        document.getElementById("JSON").innerHTML = txt;
    }
};

xmlhttp.open("POST""JSON.php"true);
xmlhttp.setRequestHeader("Content-type""application/learn-encoded");
xmlhttp.send("x=" + dbParam);