How to check user input in laravel - php

Question

I have a column input named Address, and how to check, if user input like null, 'null' and '' , the return response will be error. I have make it, but it not working.
This is my code:
$address = $request->input('address');
if ($address == null)
{
return response()->json(['message'=>'no data','success'=>0]);
}
elseif($address == '')
{
return response()->json(['message'=>'no data','success'=>0]);
}
elseif($address == 'null')
{
return response()->json(['message'=>'no data','success'=>0]);
}
else
//process
}

Answer 1

Check out laravel validation: here.
For example:
$request->validate([
'address' => 'required'
])
If you want to check if input is filled you can do this:
$request->filled('address')
Check docs for Retriving inputs.
in your case:
if(!$request->filled('address')){
return response()->json(['message'=>'no data','success'=>0]);
}

Answer 2

You may use the empty function, which would return FALSE if var exists and has a non-empty, non-zero value. Otherwise returns TRUE. This implies the following conditions considered as empty:
"" (an empty string)
0 (0 as an integer)
0.0 (0 as a float)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)
Snippet for your reference:
$address = $request->input('address');
if(empty($address)){
return response()->json(['message' => 'no data','success' => 0]);
}

Answer 3

Use laravel Validation, for more information checkout laravel doc link
$validator = Validator::make($request->all(), [
'address' => 'required'
]);
if ($validator->fails()) {
return response()->json(['error' => $validator->errors()->first()], 422);
}

Answer 4

use validation facades : https://laravel.com/docs/5.7/validation
use Illuminate\Support\Facades\Validator;
public function MyFunction(Request $request){
try {
$validator = Validator::make($request->all(), [
'address' => 'required',
]
);
if ($validator->fails()) {
$response=array('status'=>'error','errors'=>implode(',', $validator->errors()->all()));
return response()->json($response, 400);
}else{
// validation success
}
} catch (\Exception $e) {
$response=array('status'=>'error','result'=>0,'errors'=>'Internal Server Error');
return response()->json($response, 500);
}
}
}