Member Avatar for Code_GrasssHopp

I was wondering if anyone knows how to print out the contents of an array into a text file(i.e myfile.txt)

What i have is an array full of strings and my goal is to print each of them onto a seperate line in a text file.

I kno how to write single lines in a text file but not contents of an array.

Any help is greatly appreciated!!!

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Dani AI

Generated

Brief answer for PHP (one string per line), plus some practical tips that complement the C# examples posted by and the discussion about verbatim strings raised by .

A simple, safe overwrite (recommended for small-to-medium arrays):

$lines = array_map('strval', $array);               // ensure values are strings
file_put_contents($filename, implode(PHP_EOL, $lines) . PHP_EOL, LOCK_EX);

This joins entries with the OS newline (PHP_EOL), adds a final line break, and uses LOCK_EX to reduce race conditions. To append instead of overwrite use FILE_APPEND | LOCK_EX.

If the array can be very large, stream to disk to avoid high memory use:

$fp = fopen($filename, 'w');   // or 'a' to append
if ($fp === false) { /* handle error */ }
foreach ($array as $line) {
    fwrite($fp, rtrim((string)$line, "\r\n") . PHP_EOL);
}
fclose($fp);

Practical notes and troubleshooting

  • Check that PHP can write to the target folder (is_writable(dirname($filename))) and prefer fixing ownership/permissions over using 0777.
  • Sanitize any user-supplied filenames (use a whitelist, basename, or store in a fixed directory) to avoid path traversal.
  • If the file must never be partially written, write to a temp file (e.g. tempnam()), then rename() it into place for atomicity.
  • For cross-platform newline needs, explicitly use "\r\n" for Windows consumers; otherwise PHP_EOL is usually fine.
  • Watch encoding: convert to UTF-8 when required (mb_convert_encoding) and be aware of BOM if editors mis-handle files.
  • Verify success: check file_put_contents return value (bytes written) or use fwrite return values.

These PHP patterns cover the common cases; adapt them for CSV (use fputcsv) or binary output as needed.

Recommended Answers

All 3 Replies

Member Avatar for apegram 
// given array and filename
string[] array = { "apple", "banana", "cherry" };
string filename = @"C:\Temp\arrayfile.txt";

// short version
using (StreamWriter writer = new StreamWriter(filename))
{
    foreach (string item in array)
        writer.WriteLine(item);
}

// short, short version
File.WriteAllLines(filename, array);
Member Avatar for ereruh

It's a bit off-topic but could you please explain what the "@" is for in:
string filename = @"C:\Temp\arrayfile.txt";

I believe I've done similar things without the @ and it works as it should but I've also seen many people using it pretty often, what exactly does it do?
Thanks.

Member Avatar for Code_GrasssHopp

It's a bit off-topic but could you please explain what the "@" is for in:
string filename = @"C:\Temp\arrayfile.txt";

I believe I've done similar things without the @ and it works as it should but I've also seen many people using it pretty often, what exactly does it do?
Thanks.

If i am right im pretty sure it means
"take anything after this and between the quotes as a literal string"
meaning:

anything between the quotes will be taking and used AS IS

@"C:\documents\test.txt"-----means the computer will store it as (C:\documents\test.txt)

If you use this you dont have to use the \\ anymore

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