PHP .csv Parsing Windows / Mac - php

Question

I'm a beginner in this field so please excuse any mistakes I make in terms or language, I'm having issues with a program that I inherited (and don't fully understand) and am looking for a bit of help.
It's built in PHP and was working on a Mac but is not working on a Windows machine - they're both running the same version of PHP (7.1.0.) The program is reading a csv line by line but on windows the loop stops after the first iteration / line - after the actual first line (which are column headers) is skipped.
This sets up the array and is working fine on both machines:
$firstRow = null;
$i = 0;
$file = null;
$currentfig = null;
foreach ($relarray as $row) {
if($i == 0) {
echo "first line";
$firstRow = $row;
}
else {
// check which file is available
if($currentfig != $row[0]) {
$currentfig = $row[0];
if($file != null)
fclose($file);
$file = fopen("csv/".$currentfig.".csv", "w");
mkdir ("folders/" . $currentfig);
}
$csvLine = fputcsv($file, $row);
echo "others";
echo "<dl>";
for($o = 0; $o < count($row); $o++) {
echo "<dt>$firstRow[$o]</dt><dd>$row[$o]</dd>";
}
echo "</dl>";
}
$i++;
}
Then this creates the line by line process on the array:
if($csvFile == null) {
$csvFile = 'TempSheet.csv';
}
echo "<h1>Processing $csvFile </h1>";
$csvData = file_get_contents($csvFile);
$lines = explode(PHP_EOL, $csvData);
$relarray = array();
foreach ($lines as $line) {
if (!$line){
$line = null;
}
else {
$relarray[] = str_getcsv($line);
echo "rel array is";
print_r($relarray);
}
}
At this point, on the mac it creates and prints a series of arrays, one for each row, all contained in one larger array. On windows it creates just one array with
all of the elements from all rows within it.
I then take individual elements from this above one using a variety of these:
foreach ($relarray as $row) {
$subtitles = $row[18];
echo $subtitles . "<br />";
$subtitles = str_replace("&", "&", str_replace("\r\n", "\n", $subtitles));
$starray[]=$subtitles;
}
Here ^ on a Mac printing the '$starray' displays the full 5 values whereas on Windows it only displays the initial one.
I've tried a few things to no avail; including using variations of line break signifiers and changing the php.ini settings as suggested here: CSV new Line Character
I'd be very grateful for any suggestions or help, please let me know if you need further information.
Thanks

Answer 1

$lines = explode(PHP_EOL, $csvData);
Your problem is that the CSV file is parsed using PHP_EOL as line-ending character, but this constant has different values depending on the environement running the code (\r\n on Windows and \r or \n on Mac depending on pre/post OSX).
If your file has been created/saved on a Mac, it must've been saved with a \n at the end of each line (assuming the Mac is running a post-OSX version), and Windows search for a \r\n as the line end.
The consequence of this is that Windows cannot find its own line-ending characater and thinks it only has 1 big line containing all the data.
In addition to that, changing auto_detect_line_endings doesn't work in you case because you use file_get_contents which does not read line by line but the whole file at once and doesn't care about the line-ending.
So, what you could try is to enable auto_detect_line_endings and replace your following piece of code:
$csvData = file_get_contents($csvFile);
$lines = explode(PHP_EOL, $csvData);
$relarray = array();
foreach ($lines as $line) {
if (!$line){
$line = null;
}
else {
$relarray[] = str_getcsv($line);
echo "rel array is";
print_r($relarray);
}
}
By something like:
$csvFileHandle = fopen($csvFile, 'r');
$relarray = array();
if($csvFileHandle) {
while($csvLine = fgetcsv($csvFileHandle)) {
$relarray[] = $csvLine;
}
fclose($csvFileHandle );
}
Which will actually make use of the auto_detect_line_endings configuration and will correctly detect you CSV file endings + split each line in fields ($csvLine) and add them to $relarray.