file

twichi at web dot de (2011-09-13 12:33:51)

read from CSV data (file) into an array with named keys

... with or without 1st row = header (keys) 
(see 4th parameter of function call as  true / false) 

<?php 
// --------------------------------------------------------------

function csv_in_array($url,$delm=";",$encl="\"",$head=false) { 
    
    $csvxrow = file($url);   // ---- csv rows to array ----
    
    $csvxrow[0] = chop($csvxrow[0]); 
    $csvxrow[0] = str_replace($encl,'',$csvxrow[0]); 
    $keydata = explode($delm,$csvxrow[0]); 
    $keynumb = count($keydata); 
    
    if ($head === true) { 
    $anzdata = count($csvxrow); 
    $z=0; 
    for($x=1; $x<$anzdata; $x++) { 
        $csvxrow[$x] = chop($csvxrow[$x]); 
        $csvxrow[$x] = str_replace($encl,'',$csvxrow[$x]); 
        $csv_data[$x] = explode($delm,$csvxrow[$x]); 
        $i=0; 
        foreach($keydata as $key) { 
            $out[$z][$key] = $csv_data[$x][$i]; 
            $i++;
            }    
        $z++;
        }
    }
    else { 
        $i=0;
        foreach($csvxrow as $item) { 
            $item = chop($item); 
            $item = str_replace($encl,'',$item); 
            $csv_data = explode($delm,$item); 
            for ($y=0; $y<$keynumb; $y++) { 
               $out[$i][$y] = $csv_data[$y]; 
            }
        $i++;
        }
    }

return $out; 
}

// --------------------------------------------------------------

?>

fuction call with 4 parameters: 

(1) = the file with CSV data (url / string)
(2) = colum delimiter (e.g: ; or | or , ...)
(3) = values enclosed by (e.g: ' or " or ^ or ...)
(4) = with or without 1st row = head (true/false) 

<?php

// ----- call ------ 
$csvdata = csv_in_array( $yourcsvfile, ";", "\"", true ); 
// ----------------- 

// ----- view ------ 
echo "<pre>\r\n"; 
print_r($csvdata);
echo "</pre>\r\n"; 
// -----------------

?>

PS: also see: http://php.net/manual/de/function.fgetcsv.php to read CSV data into an array
... and other file-handling methods 

^

marios88 at gmail dot com (2010-02-06 02:59:51)

Quick and easy way to reverse read a file without array_reverse

<?php
$myfile = 'test.txt';
$lines = file($myfile);    
for($i=count($lines);$i>0;$i--){
    echo $lines[$i];
}
?>

d basin (2009-10-14 15:47:11)

this may be obvious, but it took me a while to figure out what I was doing wrong. So I wanted to share. I have a file on my "c:\" drive. How do I file() it? 

Don't forget the backslash is special and you have to "escape" the backslash i.e. "\\":

<?php

$lines = file("C:\\Documents and Settings\\myfile.txt");

foreach($lines as $line)
{
    echo($line);
}

?> 

hope this helps...

PenguinMan98 at usa dot net (2008-04-21 15:49:17)

on file() and flock()
My supervisor came up with a brilliant plan to workaround the inability of the file() to work on a flock()'ed file.
We created a dummy file called lockfile.txt. We would flock() lockfile.txt. Once we had a lock on it, we used file() on the file we wanted to read, then altered the file and called fclose on both files.

jon+spamcheck at phpsitesolutions dot com (2008-04-16 01:03:49)

A user suggested using rtrim always, due to the line ending conflict with files that have an EOL that differs from the server EOL.

Using rtrim with it's default character replacement is a bad solution though, as it removes all whitespace in addition to the '\r' and '\n' characters.

A good solution using rtrim follows:

<?php
$line = rtrim($line, "\r\n") . PHP_EOL;
?>

This removes only EOL characters, and replaces with the server's EOL character, thus making preg_* work fine when matching the EOL ($)

vbchris at gmail dot com (2008-02-16 01:15:40)

If you're getting "failed to open stream: Permission denied" when trying to use either file() or fopen() to access files on another server. Check your host doesn't have any firewall restrictions in-place which prevent outbound connections. This is the case with my host Aplus.net

Reversed: moc dot liamg at senroc dot werdna (2007-07-12 02:25:59)

This note applies to PHP 5.1.6 under Windows (although may apply to other versions).
It appears that the 'FILE_IGNORE_NEW_LINES' flag doesn't remove newlines properly when reading Windows-style text files, i.e. files whose lines end in '\r\n'.
Solution: Always use 'rtrim()' in preference to 'FILE_IGNORE_NEW_LINES'.

info at carstanje dot com (2006-11-28 00:33:13)

Using file() for reading large text files > 10 Mb gives problems, therefore you should use this instead. It is much slower but it works fine. $lines will return an array with all the lines.

<?php
$handle = @fopen('yourfile...', "r");
if ($handle) {
   while (!feof($handle)) {
       $lines[] = fgets($handle, 4096);
   }
   fclose($handle);
}
?>

richardtcunningham at gmail dot com (2006-07-11 02:19:37)

justin at visunet dot ie's note of 20-Mar-2003 states
"Note: Now that file() is binary safe it is 'much' slower than it used to be. If you are planning to read large files it may be worth your while using fgets() instead of file()."
I tested fgets(), file_get_contents(), and file() on PHP 4.3.2 and PHP 5 and timed each to be under a second with over 200,000 lines. I do not know if he was testing extremely long lines or what, but I could not duplicate the difference that he mentioned.

dir @ badblue com (2003-09-12 14:48:02)

Jeff's array2file function is a good start; here are a couple of improvements (no possibility of handle leak when fwrite fails, additional capability of both string2file and array2file; presumably faster performance through use of implode).

<?php
function String2File($sIn, $sFileOut) {
  $rc = false;
  do {
    if (!($f = fopen($sFileOut, "wa+"))) {
      $rc = 1; break;
    }
    if (!fwrite($f, $sIn)) {
      $rc = 2; break;
    }
    $rc = true;
  } while (0);
  if ($f) {
    fclose($f);
  }
  return ($rc);
}

function Array2File($aIn, $sFileOut) {
  return (String2File(implode("\n", $aIn), $sFileOut));
}
?>

If you're generating your string text using a GET or POST from a TEXTAREA (e.g., a mini-web-text-editor), remember that strip_slashes and str_replace of "/r/n" to "/n" may be necessary as well using these functions.

HTH --dir @ badblue com

John (2003-07-20 16:32:37)

after many months of confusion and frustration, i have finally figured out something that i should have noticed the first time around.
you can't file("test.txt") when that same file has been flocked. i guess i didn't have a full understanding of what i was doing when i used flock(). all i had to do was move the flock() around, and all was well.

justin at visunet dot ie (2003-03-20 09:36:27)

Note: Now that file() is binary safe it is 'much' slower than it used to be. If you are planning to read large files it may be worth your while using fgets() instead of file() For example:

<?php
$fd = fopen ("log_file.txt", "r");
while (!feof ($fd)) 
{
   $buffer = fgets($fd, 4096);
   $lines[] = $buffer;
}
fclose ($fd);
?>

The resulting array is $lines.

I did a test on a 200,000 line file. It took seconds with fgets()  compared to minutes with file().

andrea at brancatelli dot it (2002-03-16 11:16:02)

file() has a strange behaviour when reading file with both \n and \r as line delimitator (DOS files), since it will return an array with every single line but with just a \n in the end. It seems like \r just disappears.
This is happening with PHP 4.0.4 for OS/2. Don't know about the Windows version.

php@don't_spam_me (2002-02-09 12:56:27)

It appears that the file() function causes file access problems for perl cgi scripts accessing the same files. I am using Perl v5.6.0 in linux with PHP/4.0.4pl1. After running a php app using the file() function, any perl cgi trying to access the same file randomly dies returning an internal server error: premature end of script headers.
The simple fix is to use fopen(), fgets() and fclose() instead of file().