// data set being sent:

[
{data:{
	app_installDate:"Mon Oct 24 2016 11:15:35 GMT-0400 (EDT)",
	app_installTime:"Mon Oct 24 2016 11:15:35 GMT-0400 (EDT)",
	user_address1:"",
	user_address2:"",
	user_city:"",
	user_country:"",
	user_email:"rolinger1972@gmail.com",
	user_fName:"",
	user_lName:"",
	user_phone:"13104663399",
	user_state:"",
	user_zip:""
	},
table:"userTable",
task:1
},
{data:  {
	app_curVersion:"0.1.8",
	app_installDate:"Mon Oct 24 2016 11:15:35 GMT-0400 (EDT)",
	app_installTime:"Mon Oct 24 2016 11:15:35 GMT-0400 (EDT)",
	app_installVersion:"0.1.8",
	dev_ID:"353300064006726",
	dev_OS:"Android",
	dev_OSVersion:"6.0.1",
	dev_UUID:"db9cc73e418309bf",
	dev_carrier:"T-Mobile",
	dev_email:"rolinger1972@gmail.com",
	dev_model:"SM-G900T",
	dev_phoneNumber:"13104663399",
	dev_serial:"21939b63",
	dev_sim:"8901260422735014534",
	dev_simCountry:"us",
	dev_vendor:"samsung",
	},
table:"userDevice",
task:1
}
]

// code to process above data:
$pdo = new PDO('mysql:host=localhost;dbname=foobar', 'foo', 'bar');
$input = json_decode(file_get_contents('php://input'),true) ;
$method = $_SERVER['REQUEST_METHOD'];
foreach ($input as $row) {
    $table = $row['table'] ;
    $task = $row['task'] ;
    $sid = $row['sid'] ;
    $sidValue = $row['sidValue'] ;
    $sqlCols = array() ;
    $sqlValues = array() ;
    $sqlParams = array() ;
    $sqlInserts = array() ;
    foreach ($row['data'] as $key => $val) {
      $sqlCols[] = $key ;
      $sqlValues[] = $val ;
      $sqlInserts[] = "?" ;
      $sqlParams[":$key"] = $val ;
    }
    $colString = implode(",",$sqlCols) ;
    $valString = implode(",",$sqlValues) ;
    $insString = implode(",",$sqlInserts) ;

    // $stmt->exec([':foo'=>$foo]);
    if ($method == 'POST') {  // INSERT
      $stmt = $pdo->prepare("INSERT INTO $table ($colString) VALUES ($insString)");
      $result = $stmt->execute($sqlParams);
    } elseif ($method == 'PUT') {  // UPDATE
      $stmt = $pdo->prepare("UPDATE $table SET $colString WHERE $sid = $sidValue");
      $result = $stmt->execute([":$sid"=>$sidValue]) ;
    } elseif ($method == 'GET') { // SELECT
      $stmt = $pdo->prepare("SELECT * FROM $table WHERE $sid = $sidValue");
      $result = $stmt->execute([":$sid"=>$sidValue]) ;
    }
var_dump($result) ;  //returning: bool(false), and nothing is being inserted into db (obviously).
}