Finding a value in a php array - php

Question

I've been banging my head hard over this problem for the last 2-3 days trying to see the problem from as many different angles as possible but to no avail. I'm turning to the SO community for extra perspectives. Below is the code I have which prints all 9 product plans. I'm wanting to find and print the plan with pricing equals or closest to a given user input. How can I do this?
//arrays of productnames
$productnames=array(1=>"Beginner","Advanced","Expert");
//arrays of productlevels
$productlevels=array(1=>"Bronze","Silver","Gold");
//Get The Length of Product Name Array
$planname_array_length=count($productnames);
//Get The Length of Product Level Array
$planlevel_array_length=count($productlevels);
for ($prn=1; $prn <= $planname_array_length; $prn++) {//loop to create plan name indicators
for ($prl=1; $prl <= $planlevel_array_length; $prl++) {//loop to create plan level indicators
$getpoductsql = " SELECT name, level,productNameId,productLevelId,finalProductPrice
FROM (
SELECT wspn.productName AS name, wspl.productLevel AS level, wsp.productNameId AS productNameId, wsp.productPlanLevel AS productLevelId,
ROUND(SUM(`Price`) * 1.12) AS finalProductPrice,
FROM `products` ws
left join product_plan wsp on wsp.productId = ws.wsid
left join product_plan_level wspl on wsp.productPlanLevel = wspl.wsplid
left join product_plan_name wspn on wspn.wspnid = wsp.productNameId
WHERE wspn.productName = '$planname_array_length[$pn]' AND wspl.productLevel = '$planlevel_array_length[$pl]'
)
AS x ORDER BY ABS(finalProductPrice - $compareprice)"
$resultproducts = $conn->query($getpoductsql);
$prodArray = mysqli_fetch_array($resultproducts);
//print array of each plan
$resultArr = array('planNameID' => $prodArray['planNameId'],
'planName' => $prodArray['name'],
'planLevelID' => $prodArray['planLevelId'],
'planLevelName' => $prodArray['level'],
'planPrice' => $prodArray['finalProductPrice'];
//print arrays of products
echo json_encode($resultArr);
}
}
This will output 9 plans as follow :
{"planNameID":"1","productName":"Beginner","productLevelID":"1","productLevelName":"Bronze","productPrice":"15"}

Answer 1

Rather than performing a separate query for each product name and product level, do them all in one query, and let MySQL find the one with the closest price.
$getpoductsql = " SELECT name, level,productNameId,productLevelId,finalProductPrice
FROM (
SELECT wspn.productName AS name, wspl.productLevel AS level, wsp.productNameId AS productNameId, wsp.productPlanLevel AS productLevelId,
ROUND(SUM(`Price`) * 1.12) AS finalProductPrice,
FROM `products` ws
left join product_plan wsp on wsp.productId = ws.wsid
left join product_plan_level wspl on wsp.productPlanLevel = wspl.wsplid
left join product_plan_name wspn on wspn.wspnid = wsp.productNameId
WHERE wspn.productName IN ('Beginner', 'Advanced', 'Expert') AND wspl.productLevel IN ('Bronze', 'Silver', 'Gold')
GROUP BY productNameId, productLevelId
)
AS x ORDER BY ABS(finalProductPrice - $compareprice)"

Answer 2

forgive my formatting, I'm on mobile
Like Amr Berag said above, your result should be the first row returned from your query.
If you have a table like this:
ID value
---- ------
A 7
B 12
C 23
...
You can then SELECT from this table to find the closest to some value, like so:
(Assume your desired value is $VALUE)
SELECT id, value, ABS(value - $VALUE) AS diff
FROM your_table
ORDER BY diff ASC
This will return something like this (say $VALUE is 10):
id value diff
-- ------ ----
B 12 2
A 7 3
C 23 13
...
You can just pick the first row.
You may also be able to add a WHERE clause to only select the row with the least difference using the MIN function:
SELECT id, value, ABS(value - $VALUE) AS diff
FROM your_table
WHERE diff = MIN(diff)

Answer 3

The way you are doing it will produce invalid json, do it like this:
$result=array();
for ($prn=1; $prn <= $planname_array_length; $prn++) {
for ($prl=1; $prl <= $planlevel_array_length; $prl++) {
. . . // the other code
//print array of each plan
$resultArr = array('planNameID' => $prodArray['planNameId'],
'planName' => $prodArray['name'], 'planLevelID' => $prodArray['planLevelId'],
'planLevelName' => $prodArray['level'],
'planPrice' => $prodArray['finalProductPrice'];
//print arrays of products
$resul[]=$resultArr;
}//loop1
}//loop2
echo json_encode($result);
you should also add the limit 1 and do the rest in JS in the front end