get.php

<?php

$dataFile = 'ss.dat';

$cleandate = $_GET['cleandate'];
$userhouse = $_GET['userhouse'];
$userid = $_GET['userid'];

$fp   = fopen($dataFile, "r");
while (($dataRow = fgetcsv($fp, 0, ",")) !== FALSE) {
    $dataArray[] = $dataRow;
}
fclose($fp);  

$rightData = array();
foreach ($dataArray as $eachData){
// dataArray:[0]2015-2-15 [1]根津　[2]太田　[3]400 [4]0みたいな各配列
// eachData[0]:ex 2015-02-15
// eachData[1]:ex 根津
// eachData[2]:ex 太田
// eachData[3]:コインランドリー代
// eachData[4]:立替費用
if(
	$eachData[0] == $cleandate &&
	$eachData[1] == $userhouse &&
	$eachData[2] == $userid
	){$rightData = $eachData;
}
}
if(
	$rightData[3] == null or
	$rightData[4] == null){
	$rightData[3] = "";
	$rightData[4] = "";
}

$response = array(
	'cleandate' => $cleandate,
	'coinlaundry' => $rightData[3],
	'cost' => $rightData[4]
	);

echo json_encode($response);