PHP - Display differences between two CSV files - php

Question

I have written a small script which upload two csv files and compare them.
//set files upload directory
$target_dir1 = "uploads/old/";
$target_file1 = $target_dir1 . basename($_FILES["fileToUpload1"]["name"]);
$target_dir2 = "uploads/new/";
$target_file2 = $target_dir2 . basename($_FILES["fileToUpload2"]["name"]);
$uploadOk = 1;
//Upload files
if ($uploadOk == 0) {
echo "<BR> Sorry, your files were not uploaded. <BR>";
} else {
if (move_uploaded_file($_FILES["fileToUpload1"]["tmp_name"], $target_file1)) {
echo "<BR> The 1st file ". basename( $_FILES["fileToUpload1"]["name"]). " has been uploaded. <BR>";
} else {
echo "<BR> Sorry, there was an error uploading your 1st file. <BR>";
}
if (move_uploaded_file($_FILES["fileToUpload2"]["tmp_name"], $target_file2)) {
echo "<BR> The 2nd file ". basename( $_FILES["fileToUpload2"]["name"]). " has been uploaded.<BR>";
} else {
echo "<BR> Sorry, there was an error uploading your 2nd file. <BR>";
}
}
//Get contetnt 1st file
$table1 = Array();
$filehandle1 = fopen($target_file1, "r") ;
if($filehandle1 !== FALSE) {
while(! feof($filehandle1)) { // feof end of file
$data1 = fgetcsv($filehandle1, 1000, ",");
array_push($table1, $data1);
}
}
fclose($filehandle1);
//Get content 2nd file
$table2 = Array();
$filehandle2 = fopen($target_file2, "r") ;
if($filehandle2 !== FALSE) {
while(! feof($filehandle2)) {
$data2 = fgetcsv($filehandle2, 1000, ",");
array_push($table2, $data2);
}
}
fclose($filehandle2);
//Find difference between these two files
$headers= array();
$headers = $table1[0];
$i= 0;
foreach ($table1 as $table) {
echo '<BR>';
$diff = array_diff($table2[$i], $table);
if(!empty($diff)) {
print_r($diff);
$chiave= key($diff);
echo $headers[$chiave];
};
echo '<BR>';
$i++;
}
And this is the error I get, however difference between the two files are dispalyed correctly:
Warning: array_diff(): Argument #1 is not an array in /var/www/csv_files/upload.php on line 67 Call Stack: 0.0053 337384 1. {main}() /var/www/csv_files/upload.php:0 0.0064 367220 2. array_diff() /var/www/csv_files/upload.php:67

Answer 1

You get this error because the first argument is not a array where one is expected. You are now checking a table with the nth element of a array but not the whole array. I think you are making a mistake in thinking table2 is a 2 dimensional array, and it's not. It is used a one dimensional array with nth data2 elements.
Hope this helps!

Answer 2

Seems yes, sometimes table2 is empty or those CSV files have different amount of rows - as result that warning.
So - you need add extra checks if $table2[$i] is not null.
Just a bit another variant from me - how to read file faster (Get content 1st and second file):
$table1 = file($target_file1);
$table2 = file($target_file2);
And then you can do same things as before, with extra tests:
if (count($table1)) {
$headers = str_getcsv($table1[0]);
foreach ($table1 as $key => $table) {
if (!isset($table2[$key])) {
echo 'Row ' . ($key+1) . ' is not exists in second CSV file.';
} else {
$diff = array_diff(str_getcsv($table2[$key]), str_getcsv($table));
// Here is code as in your example
print_r($diff);
$chiave = key($diff);
echo $headers[$chiave];
}
}
}
Good luck! :)