Matching row data from excel to an array in php - php

Question

$emapData[3] is row 4 input data in the excel, how would I match $emapData[3] to $categories which is an array. Like if $emapData[3](row 4 excel input , so if user puts AMT 1) is == AMT 1 which exist in $categories array it will insert 5801D447D5583 to the Database which is the value of AMT 1. Also whatever input from the user it will match to categories array it exists. I have tried below.
$filename=$_FILES["file"]["tmp_name"];
if($_FILES["file"]["size"] > 0)
{
$file = fopen($filename, "r");
$count = 0;
$stud_id = strtoupper(uniqid());
$categories=array("5801D447D5583" => "AMT 1","5801D447D5583" => "AMT 2","5801D457CAF7F" => "AMT 3");
while (($emapData = fgetcsv($file, 10000, ",")) !== FALSE)
{
$count++;
$stud_id = strtoupper(uniqid());
$added_by = $_SESSION['userid'];
if($count > 1) {
echo $count;
$sql = "INSERT into students(stud_id ,stud_no , first_name , last_name, date_added ,added_by) values ('$stud_id','$emapData[0]','$emapData[1]', '$emapData[2]' ,NOW(), '$added_by')";
$emapData[3] = $categories['AMT 1'];
$sql1 = "INSERT into categories(student_id ,category_id ) values ('$stud_id','$emapData[3]')";
mysql_query($sql);
}

Answer 1

I would use array search
http://php.net/manual/en/function.array-search.php
array_search — Searches the array for a given value and returns the first corresponding key if successful
So something like
$value = array_search('AMT 1', $categories);
Outputs:
5801D447D5583
So as you said all this
$emapData[3] is row 4 input data in the excel , how would I match $emapData[3] to $categories which is an array. Like if $emapData[3](row 4 excel input , so if user puts AMT 1) is == AMT 1
you would put something like array_search($emapData[3], $categories);
But I would check if it's found by doing
if( $value !== false)
Note- you need to use !== that checks the type as array search can return index 0 in some cases which is false in PHP. IN your particular case you don't have index 0 but it's good practice anyway. If you read the PHP documentation, specifically this warning.
Warning This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.
That is what it is saying.
Cheers.
UPDATE
This line in your code
$emapData[3] = $categories['AMT 1'];
I would replace with at least
$emapData[3] = array_search($emapData[3], $categories);
if(false !== $emapData[3]){
//insert
}else{
//do something else?
}
However there is a lot of other "Stuff" such as using mysql_ family of functions which are removed in PHP7, as well as directly inserting data into your query, which is a security issue, even from a file. It's called SQL Injection.
Personally I wouldn't overwrite $emapData[3] and instead use a separate variable, but I think that is the least of your worries at this point.
But those things are beyond the scope of this question, however I do strongly suggest using something like PDO and prepared statements instead.
UPDATE1
This bit of code
while (($emapData = fgetcsv($file, 10000, ",")) !== FALSE)
{
///..other code
if($count > 1) { //missing closing }
echo $count;
$sql = "INSERT into students(stud_id ,stud_no , first_name , last_name, date_added ,added_by) values ('$stud_id','$emapData[0]','$emapData[1]', '$emapData[2]' ,NOW(), '$added_by')";
$emapData[3] = $categories['AMT 1'];
$sql1 = "INSERT into categories(student_id ,category_id ) values ('$stud_id','$emapData[3]')";
mysql_query($sql);
} //end while
You'll note besides missing the ending } which I pointed out in comments, you never call mysql_query($sql1); so this second insert is never executed.
Ok... So the simple fix is to just add that in like this:
while (($emapData = fgetcsv($file, 10000, ",")) !== FALSE)
{
///..other code
if($count > 1) { //missing closing }
echo $count;
$sql = "INSERT into students(stud_id ,stud_no , first_name , last_name, date_added ,added_by) values ('$stud_id','$emapData[0]','$emapData[1]', '$emapData[2]' ,NOW(), '$added_by')";
mysql_query($sql);
$emapData[3] = $categories['AMT 1'];
$sql1 = "INSERT into categories(student_id ,category_id ) values ('$stud_id','$emapData[3]')";
mysql_query($sql1);
} //end while
You'll notice I moved the first one mysql_query($sql); which is simply for readability sake, you create a query and execute it. So it reads better to create 1 query execute it, then create a second query and execute that, the two things are separate operations independent of one another.
The last bit is I don't know exactly how you dealt with the original issue, but putting that all together should be something like:
while (($emapData = fgetcsv($file, 10000, ",")) !== FALSE)
{
///..other code
if($count > 1) {
echo $count;
$emapData[3] = array_search($emapData[3], $categories);
if(false !== $emapData[3]){
$sql = "INSERT into students(stud_id ,stud_no , first_name , last_name, date_added ,added_by) values ('$stud_id','$emapData[0]','$emapData[1]', '$emapData[2]' ,NOW(), '$added_by')";
mysql_query($sql);
$emapData[3] = $categories['AMT 1'];
$sql1 = "INSERT into categories(student_id ,category_id ) values ('$stud_id','$emapData[3]')";
mysql_query($sql1);
}else{
/*
do something else?
It's a question as I have no way to know the importance of
the array search to the insert, maybe it's ok if it's null.
maybe that is an error that ruins one or both inserts?
So without knowing that, I have no idea on the exact
implementation of non-matching states.
*/
}
}//end if $count
} //end while