fgetcsv
It's worth noting that this function only assumes chr(10) as a line break, but not chr(13). Personally, I prefer using chr(13) as a line break.
fgets
(PHP 4, PHP 5)
fgets — Prende una riga da un puntatore a file
Descrizione
string fgets
( resource $handle
, int $length
)
Restituisce una stringa di length - 1 byte letti dal file puntato da handle . La lettura termina quando sono stati letti length - 1 byte, oppure si incontra il carattere di newline (che viene incluso nel valore restituito), oppure alla fine del file (EOF) qualora giunga prima. Se non si specifica length, si assume come default 1k, o 1024 byte.
Se si verifica un errore, la funzione restituisce FALSE.
Errori comuni:
Le persone abituate alla semantica 'C' di fgets notino la differenza nel trattamento dell'EOF.
Il puntatore al file deve essere valido, e deve puntare ad un file aperto con successo da fopen() o fsockopen() (e non ancora chiuso da fclose()).
Segue un semplice esempio:
Example #1 Legge un file riga per riga
<?php
$handle = fopen("/tmp/inputfile.txt", "r");
while (!feof($handle)) {
$buffer = fgets($fd, 4096);
echo $buffer;
}
fclose($handle);
?>
Nota: Il parametro length è diventato opzionale a partire da PHP 4.2.0, se omesso, si assume come lunghezza della linea 1024. A partire dalla versione 4.3, l'omissione del parametro length comporta la lettura del flusso d'ingresso sino al raggiungimento della fine della linea. Se la maggior parte delle righe lette dal file hanno dimensione superiore a 8KB, è più efficiente specificare la lunghezza massima della linea.
Nota: A partire da PHP 4.3 questa funzione è 'binary safe'. Le versioni precedenti non lo sono.
Nota: Se si hanno problemi con il PHP che non riconosce i fine linea leggendo file creati o ospitati su un computer Macintosh, si può abilitare l'opzione auto_detect_line_endings della configurazione di runtime.
Vedere anche fread(), fgetc(), stream_get_line(), fopen(), popen(), fsockopen() e stream_set_timeout().
add a note
User Contributed Notesfgets
jerem-NoSpam-ified at live dot com
17-Apr-2008 08:22
17-Apr-2008 08:22
Daniel Klein
25-Jan-2008 08:47
25-Jan-2008 08:47
The file pointer that fgets() uses can also be created with the proc_open() function and used with the stdout pipe created from the executed process.
david_sitller at blackbit dot de
24-Oct-2007 05:32
24-Oct-2007 05:32
If you use the example from the command-description, i recommend to trim the $buffer for further use. The line feed ist still at the end of the line. I saw this when using PHP CLI.
Like this, checking a file-list for existing entries:
$handle = fopen ("/tmp/files.txt", "r");
while (!feof($handle)) {
$buffer = fgets($handle, 4096);
if (file_exists(rtrim($filename,"\n"))) {
echo $buffer;
} else {
echo $buffer." has been removed."
}
fclose ($handle);
anacreo has gmail
18-Sep-2007 02:15
18-Sep-2007 02:15
I'm using this function to modify the header of a large postscript document on copy... Works extremely quickly so far...
function write($filename) {
$fh = fopen($this->sourceps,'r');
$fw = fopen($filename,'w');
while (!feof($fh)) {
$buffer = fgets($fh);
fwrite($fw,$buffer);
if (!$setupfound && ereg("^%%BeginSetup",$buffer)) {
$setupfound++;
if (array_key_exists("$filename",$this->output)) {
foreach ($this->output[$filename] as $function => $value) {
fwrite($fw,$value);
}
}
stream_copy_to_stream($fh,$fw);
}
}
fclose($fw);
fclose($fh);
}
Peter Schlaile
21-Aug-2007 11:36
21-Aug-2007 11:36
fscanf($file, "%s\n") isn't really a good substitution for fgets(), since it will stop parsing at the first whitespace and not at the end of line!
(See the fscanf page for details on this)
David at Weintraub.name
10-Jul-2007 02:23
10-Jul-2007 02:23
There's an error in the documentation:
The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).
You should also add "popen" and "pclose" to the documentation. I'm a new PHP developer and went to verify that I could use "fgets" on commands that I used with "popen".
JOhn
22-Jun-2007 04:12
22-Jun-2007 04:12
I would like to know if there is a way to pull out information from a ,txt file so that it will show only a section of the file in the browser and no the whole file. these are small files of 10 lines but need to be able to pull specific information in the txt file out into the page.
I am new to php and functions and I know how to pull the file into the page but can not seem to get the page to show a character range etc of the information from the file
d at foo.com
13-Aug-2006 01:03
13-Aug-2006 01:03
For sockets, If you dont want fgets, fgetc etc... to block if theres no data there. set socket_set_blocking(handle,false); and socket_set_blocking(handle,true); to set it back again.
svayn at yahoo dot com
14-Jul-2006 02:21
14-Jul-2006 02:21
fgets is SLOW for scanning through large files. If you don't have PHP 5, use fscanf($file, "%s\n") instead.
sam dot bryan at montal dot com
23-May-2006 02:09
23-May-2006 02:09
An easy way to authenticate Windows Domain users from scripts running on a non-Windows or non-Domain box - pass the submitted username and password to an IMAP service on a Windows machine.
<?php
$server = 'imapserver';
$user = 'user';
$pass = 'pass';
if (authIMAP($user, $pass, $server)) {
echo "yay";
} else {
echo "nay";
}
function authIMAP($user, $pass, $server) {
$connection = fsockopen($server, 143, $errno, $errstr, 30);
if(!$connection) return false;
$output = fgets($connection, 128); // banner
fputs($connection, "1 login $user $pass\r\n");
$output = fgets($connection, 128);
fputs($connection, "2 logout\r\n");
fclose($connection);
if (substr($output, 0, 4) == '1 OK') return true;
return false;
}
?>
24-Mar-2006 09:36
Macintosh line endings mentioned in docs refer to Mac OS Classic. You don't need this setting for interoperability with unixish OS X.
tavernadelleidee[italy]
09-Mar-2006 03:44
09-Mar-2006 03:44
I think that the quickest way of read a (long) file with the rows in reverse order is
<?php
$myfile = 'myfile.txt';
$command = "tac $myfile > /tmp/myfilereversed.txt";
passthru($command);
$ic = 0;
$ic_max = 100; // stops after this number of rows
$handle = fopen("/tmp/myfilereversed.txt", "r");
while (!feof($handle) && ++$ic<=$ic_max) {
$buffer = fgets($handle, 4096);
echo $buffer."<br>";
}
fclose($handle);
?>
It echos the rows while it is reading the file so it is good for long files like logs.
Borgonovo
ecvej
04-Jan-2006 01:20
04-Jan-2006 01:20
I would have expected the same behaviour from these bits of code:-
<?php
/*This times out correctly*/
while (!feof($fp)) {
echo fgets($fp);
}
/*This times out before eof*/
while ($line=fgets($fp)) {
echo $line;
}
/*A reasonable fix is to set a long timeout*/
stream_set_timeout($fp, 180);
while ($line=fgets($fp)) {
echo $line;
}
?>
hackajar <matt> yahoo <trot> com
05-Dec-2005 12:17
05-Dec-2005 12:17
When working with VERY large files, php tends to fall over sideways and die.
Here is a neat way to pull chunks out of a file very fast and won't stop in mid line, but rater at end of last known line. It pulled a 30+ million line 900meg file through in ~ 24 seconds.
NOTE:
$buf just hold current chunk of data to work with. If you try "$buf .=" (note 'dot' in from of '=') to append $buff, script will come to grinding crawl around 100megs of data, so work with current data then move on!
//File to be opened
$file = "huge.file";
//Open file (DON'T USE a+ pointer will be wrong!)
$fp = fopen($file, 'r');
//Read 16meg chunks
$read = 16777216;
//\n Marker
$part = 0;
while(!feof($fp)) {
$rbuf = fread($fp, $read);
for($i=$read;$i > 0 || $n == chr(10);$i--) {
$n=substr($rbuf, $i, 1);
if($n == chr(10))break;
//If we are at the end of the file, just grab the rest and stop loop
elseif(feof($fp)) {
$i = $read;
$buf = substr($rbuf, 0, $i+1);
break;
}
}
//This is the buffer we want to do stuff with, maybe thow to a function?
$buf = substr($rbuf, 0, $i+1);
//Point marker back to last \n point
$part = ftell($fp)-($read-($i+1));
fseek($fp, $part);
}
fclose($fp);
kpeters AT-AT monolithss DEE OH TEE com
01-Dec-2005 05:51
01-Dec-2005 05:51
It appears that fgets() will return FALSE on EOF (before feof has a chance to read it), so this code will throw an exception:
while (!feof($fh)) {
$line = fgets($fh);
if ($line === false) {
throw new Exception("File read error");
}
}
dandrews OVER AT 3dohio DOT com
07-Jan-2005 11:11
07-Jan-2005 11:11
Saku's example may also be used like this:
<?php
@ $pointer = fopen("$DOCUMENT_ROOT/foo.txt", "r"); // the @ suppresses errors so you have to test the pointer for existence
if ($pointer) {
while (!feof($pointer)) {
$preTEXT = fgets($pointer, 999);
// $TEXT .= $preTEXT; this is better for a string
$ATEXT[$I] = $preTEXT; // maybe better as an array
$I++;
}
fclose($pointer);
}
?>
angelo [at] mandato <dot> com
19-Nov-2004 06:43
19-Nov-2004 06:43
Sometimes the strings you want to read from a file are not separated by an end of line character. the C style getline() function solves this. Here is my version:
<?php
function getline( $fp, $delim )
{
$result = "";
while( !feof( $fp ) )
{
$tmp = fgetc( $fp );
if( $tmp == $delim )
return $result;
$result .= $tmp;
}
return $result;
}
// Example:
$fp = fopen("/path/to/file.ext", 'r');
while( !feof($fp) )
{
$str = getline($fp, '|');
// Do something with $str
}
fclose($fp);
?>
lelkesa
04-Nov-2004 02:54
04-Nov-2004 02:54
Note that - afaik - fgets reads a line until it reaches a line feed (\\n). Carriage returns (\\r) aren't processed as line endings.
However, nl2br insterts a <br /> tag before carriage returns as well.
This is useful (but not nice - I must admit) when you want to store a more lines in one.
<?php
function write_lines($text) {
$file = fopen('data.txt', 'a');
fwrite($file, str_replace("\n", ' ', $text)."\n");
fclose($file);
}
function read_all() {
$file = fopen('data.txt', 'r');
while (!feof($file)) {
$line = fgets($file);
echo '<u>Section</u><p>nl2br'.($line).'</p>';
}
fclose($file);
}
?>
Try it.
05-Sep-2004 03:05
If you need to simulate an un-buffered fgets so that stdin doesnt hang there waiting for some input (i.e. it reads only if there is data available) use this :
<?php
function fgets_u($pStdn) {
$pArr = array($pStdn);
if (false === ($num_changed_streams = stream_select($pArr, $write = NULL, $except = NULL, 0))) {
print("\$ 001 Socket Error : UNABLE TO WATCH STDIN.\n");
return FALSE;
} elseif ($num_changed_streams > 0) {
return trim(fgets($pStdn, 1024));
}
}
?>
rstefanowski at wi dot ps dot pl
12-Aug-2004 09:03
12-Aug-2004 09:03
Take note that fgets() reads 'whole lines'. This means that if a file pointer is in the middle of the line (eg. after fscanf()), fgets() will read the following line, not the remaining part of the currnet line. You could expect it would read until the end of the current line, but it doesn't. It skips to the next full line.
timr
16-Jun-2004 07:13
16-Jun-2004 07:13
If you need to read an entire file into a string, use file_get_contents(). fgets() is most useful when you need to process the lines of a file separately.
Saku
04-Jun-2004 05:47
04-Jun-2004 05:47
As a beginner I would have liked to see "how to read a file into a string for use later and not only how to directly echo the fgets() result. This is what I derived:
<?php
@ $pointer = fopen("$DOCUMENT_ROOT/foo.txt", "r"); // the @ suppresses errors so you have to test the pointer for existence
if ($pointer) {
while (!feof($pointer)) {
$preTEXT = fgets($pointer, 999);
$TEXT = $TEXT . $preTEXT;
}
fclose($pointer);
}
?>
Pete
22-Feb-2004 04:35
22-Feb-2004 04:35
If you have troubles reading binary data with versions <= 4.3.2 then upgrade to 4.3.3
The binary safe implementation seems to have had bugs which were fixed in 4.3.3