ScotlandPHP

fopen

(PHP 4, PHP 5, PHP 7)

fopenOpens file or URL

Description

resource fopen ( string $filename , string $mode [, bool $use_include_path = false [, resource $context ]] )

fopen() binds a named resource, specified by filename, to a stream.

Parameters

filename

If filename is of the form "scheme://...", it is assumed to be a URL and PHP will search for a protocol handler (also known as a wrapper) for that scheme. If no wrappers for that protocol are registered, PHP will emit a notice to help you track potential problems in your script and then continue as though filename specifies a regular file.

If PHP has decided that filename specifies a local file, then it will try to open a stream on that file. The file must be accessible to PHP, so you need to ensure that the file access permissions allow this access. If you have enabled safe mode or open_basedir further restrictions may apply.

If PHP has decided that filename specifies a registered protocol, and that protocol is registered as a network URL, PHP will check to make sure that allow_url_fopen is enabled. If it is switched off, PHP will emit a warning and the fopen call will fail.

Note:

The list of supported protocols can be found in Supported Protocols and Wrappers. Some protocols (also referred to as wrappers) support context and/or php.ini options. Refer to the specific page for the protocol in use for a list of options which can be set. (e.g. php.ini value user_agent used by the http wrapper).

On the Windows platform, be careful to escape any backslashes used in the path to the file, or use forward slashes.

<?php
$handle 
fopen("c:\\folder\\resource.txt""r");
?>

mode

The mode parameter specifies the type of access you require to the stream. It may be any of the following:

A list of possible modes for fopen() using mode
mode Description
'r' Open for reading only; place the file pointer at the beginning of the file.
'r+' Open for reading and writing; place the file pointer at the beginning of the file.
'w' Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
'w+' Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
'a' Open for writing only; place the file pointer at the end of the file. If the file does not exist, attempt to create it. In this mode, fseek() has no effect, writes are always appended.
'a+' Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it. In this mode, fseek() only affects the reading position, writes are always appended.
'x' Create and open for writing only; place the file pointer at the beginning of the file. If the file already exists, the fopen() call will fail by returning FALSE and generating an error of level E_WARNING. If the file does not exist, attempt to create it. This is equivalent to specifying O_EXCL|O_CREAT flags for the underlying open(2) system call.
'x+' Create and open for reading and writing; otherwise it has the same behavior as 'x'.
'c' Open the file for writing only. If the file does not exist, it is created. If it exists, it is neither truncated (as opposed to 'w'), nor the call to this function fails (as is the case with 'x'). The file pointer is positioned on the beginning of the file. This may be useful if it's desired to get an advisory lock (see flock()) before attempting to modify the file, as using 'w' could truncate the file before the lock was obtained (if truncation is desired, ftruncate() can be used after the lock is requested).
'c+' Open the file for reading and writing; otherwise it has the same behavior as 'c'.
'e' Set close-on-exec flag on the opened file descriptor. Only available in PHP compiled on POSIX.1-2008 conform systems.

Note:

Different operating system families have different line-ending conventions. When you write a text file and want to insert a line break, you need to use the correct line-ending character(s) for your operating system. Unix based systems use \n as the line ending character, Windows based systems use \r\n as the line ending characters and Macintosh based systems use \r as the line ending character.

If you use the wrong line ending characters when writing your files, you might find that other applications that open those files will "look funny".

Windows offers a text-mode translation flag ('t') which will transparently translate \n to \r\n when working with the file. In contrast, you can also use 'b' to force binary mode, which will not translate your data. To use these flags, specify either 'b' or 't' as the last character of the mode parameter.

The default translation mode depends on the SAPI and version of PHP that you are using, so you are encouraged to always specify the appropriate flag for portability reasons. You should use the 't' mode if you are working with plain-text files and you use \n to delimit your line endings in your script, but expect your files to be readable with applications such as notepad. You should use the 'b' in all other cases.

If you do not specify the 'b' flag when working with binary files, you may experience strange problems with your data, including broken image files and strange problems with \r\n characters.

Note:

For portability, it is strongly recommended that you always use the 'b' flag when opening files with fopen().

Note:

Again, for portability, it is also strongly recommended that you re-write code that uses or relies upon the 't' mode so that it uses the correct line endings and 'b' mode instead.

use_include_path

The optional third use_include_path parameter can be set to '1' or TRUE if you want to search for the file in the include_path, too.

context

Note: Context support was added with PHP 5.0.0. For a description of contexts, refer to Streams.

Return Values

Returns a file pointer resource on success, or FALSE on error.

Errors/Exceptions

If the open fails, an error of level E_WARNING is generated. You may use @ to suppress this warning.

Changelog

Version Description
7.0.16, 7.1.2 The 'e' option were added.
5.2.6 The 'c' and 'c+' options were added
4.3.2 As of PHP 4.3.2, the default mode is set to binary for all platforms that distinguish between binary and text mode. If you are having problems with your scripts after upgrading, try using the 't' flag as a workaround until you have made your script more portable as mentioned before

Examples

Example #1 fopen() examples

<?php
$handle 
fopen("/home/rasmus/file.txt""r");
$handle fopen("/home/rasmus/file.gif""wb");
$handle fopen("http://www.example.com/""r");
$handle fopen("ftp://user:password@example.com/somefile.txt""w");
?>

Notes

Warning

When using SSL, Microsoft IIS will violate the protocol by closing the connection without sending a close_notify indicator. PHP will report this as "SSL: Fatal Protocol Error" when you reach the end of the data. To work around this, the value of error_reporting should be lowered to a level that does not include warnings. PHP can detect buggy IIS server software when you open the stream using the https:// wrapper and will suppress the warning. When using fsockopen() to create an ssl:// socket, the developer is responsible for detecting and suppressing this warning.

Note: When safe mode is enabled, PHP checks whether the directory in which the script is operating has the same UID (owner) as the script that is being executed.

Note:

If you are experiencing problems with reading and writing to files and you're using the server module version of PHP, remember to make sure that the files and directories you're using are accessible to the server process.

Note:

This function may also succeed when filename is a directory. If you are unsure whether filename is a file or a directory, you may need to use the is_dir() function before calling fopen().

See Also

add a note add a note

User Contributed Notes 43 notes

up
62
chapman at worldtakeoverindustries dot com
5 years ago
Note - using fopen in 'w' mode will NOT update the modification time (filemtime) of a file like you may expect. You may want to issue a touch() after writing and closing the file which update its modification time. This may become critical in a caching situation, if you intend to keep your hair.
up
9
php at delhelsa dot com
9 years ago
With php 5.2.5 on Apache 2.2.4, accessing files on an ftp server with fopen() or readfile() requires an extra forwardslash if an absolute path is needed.

i.e., if a file called bullbes.txt is stored under /var/school/ on ftp server example.com and you're trying to access it with user blossom and password buttercup, the url would be:

ftp://blossom:buttercup@example.com//var/school/bubbles.txt

Note the two forwardslashes. It looks like the second one is needed so the server won't interpret the path as relative to blossom's home on townsville.
up
8
info at b1g dot de
11 years ago
Simple class to fetch a HTTP URL. Supports "Location:"-redirections. Useful for servers with allow_url_fopen=false. Works with SSL-secured hosts.

<?php
#usage:
$r = new HTTPRequest('http://www.example.com');
echo
$r->DownloadToString();

class
HTTPRequest
{
    var
$_fp;        // HTTP socket
   
var $_url;        // full URL
   
var $_host;        // HTTP host
   
var $_protocol;    // protocol (HTTP/HTTPS)
   
var $_uri;        // request URI
   
var $_port;        // port
   
    // scan url
   
function _scan_url()
    {
       
$req = $this->_url;
       
       
$pos = strpos($req, '://');
       
$this->_protocol = strtolower(substr($req, 0, $pos));
       
       
$req = substr($req, $pos+3);
       
$pos = strpos($req, '/');
        if(
$pos === false)
           
$pos = strlen($req);
       
$host = substr($req, 0, $pos);
       
        if(
strpos($host, ':') !== false)
        {
            list(
$this->_host, $this->_port) = explode(':', $host);
        }
        else
        {
           
$this->_host = $host;
           
$this->_port = ($this->_protocol == 'https') ? 443 : 80;
        }
       
       
$this->_uri = substr($req, $pos);
        if(
$this->_uri == '')
           
$this->_uri = '/';
    }
   
   
// constructor
   
function HTTPRequest($url)
    {
       
$this->_url = $url;
       
$this->_scan_url();
    }
   
   
// download URL to string
   
function DownloadToString()
    {
       
$crlf = "\r\n";
       
       
// generate request
       
$req = 'GET ' . $this->_uri . ' HTTP/1.0' . $crlf
           
.    'Host: ' . $this->_host . $crlf
           
.    $crlf;
       
       
// fetch
       
$this->_fp = fsockopen(($this->_protocol == 'https' ? 'ssl://' : '') . $this->_host, $this->_port);
       
fwrite($this->_fp, $req);
        while(
is_resource($this->_fp) && $this->_fp && !feof($this->_fp))
           
$response .= fread($this->_fp, 1024);
       
fclose($this->_fp);
       
       
// split header and body
       
$pos = strpos($response, $crlf . $crlf);
        if(
$pos === false)
            return(
$response);
       
$header = substr($response, 0, $pos);
       
$body = substr($response, $pos + 2 * strlen($crlf));
       
       
// parse headers
       
$headers = array();
       
$lines = explode($crlf, $header);
        foreach(
$lines as $line)
            if((
$pos = strpos($line, ':')) !== false)
               
$headers[strtolower(trim(substr($line, 0, $pos)))] = trim(substr($line, $pos+1));
       
       
// redirection?
       
if(isset($headers['location']))
        {
           
$http = new HTTPRequest($headers['location']);
            return(
$http->DownloadToString($http));
        }
        else
        {
            return(
$body);
        }
    }
}
?>
up
3
ideacode
12 years ago
Note that whether you may open directories is operating system dependent. The following lines:

<?php
// Windows ($fh === false)
$fh = fopen('c:\\Temp', 'r');

// UNIX (is_resource($fh) === true)
$fh = fopen('/tmp', 'r');
?>

demonstrate that on Windows (2000, probably XP) you may not open a directory (the error is "Permission Denied"), regardless of the security permissions on that directory.

On UNIX, you may happily read the directory format for the native filesystem.
up
5
splogamurugan at gmail dot com
6 years ago
While opening a file with multibyte data (Ex: données multi-octets), faced some issues with the encoding. Got to know that it uses  windows-1250. Used iconv to convert it to UTF-8 and it resolved the issue. 

<?php
function utf8_fopen_read($fileName) {
   
$fc = iconv('windows-1250', 'utf-8', file_get_contents($fileName));
   
$handle=fopen("php://memory", "rw");
   
fwrite($handle, $fc);
   
fseek($handle, 0);
    return
$handle;
}
?>

Example usage:

<?php
$fh
= utf8_fopen_read("./tpKpiBundle.csv");
while ((
$data = fgetcsv($fh, 1000, ",")) !== false) {
    foreach (
$data as $value) {
        echo
$value . "<br />\n";
    }
}
?>

Hope it helps.
up
5
flobee
11 years ago
download: i need a function to simulate a "wget url" and do not buffer the data in the memory to avoid thouse problems on large files:
<?php
function download($file_source, $file_target) {
       
$rh = fopen($file_source, 'rb');
       
$wh = fopen($file_target, 'wb');
        if (
$rh===false || $wh===false) {
// error reading or opening file
          
return true;
        }
        while (!
feof($rh)) {
            if (
fwrite($wh, fread($rh, 1024)) === FALSE) {
                  
// 'Download error: Cannot write to file ('.$file_target.')';
                  
return true;
               }
        }
       
fclose($rh);
       
fclose($wh);
       
// No error
       
return false;
    }
?>
up
3
apathetic012 at gmail dot com
5 years ago
a variable $http_response_header is available when doing the fopen(). Which contains an array of the response header.
up
2
Luiz Miguel Axcar (lmaxcar at yahoo dot com dot br)
12 years ago
If you are getting message "Warning: fopen(): URL file-access is disabled in the server configuration", you can use function below to get the content from a local or remote file.

Function uses CURL lib, follow the link to get help: http://www.php.net/curl

<?php
/*
   * @return string
   * @param string $url
   * @desc Return string content from a remote file
   * @author Luiz Miguel Axcar (lmaxcar@yahoo.com.br)
*/

function get_content($url)
{
   
$ch = curl_init();

   
curl_setopt ($ch, CURLOPT_URL, $url);
   
curl_setopt ($ch, CURLOPT_HEADER, 0);

   
ob_start();

   
curl_exec ($ch);
   
curl_close ($ch);
   
$string = ob_get_contents();

   
ob_end_clean();
   
    return
$string;    
}

#usage:
$content = get_content ("http://www.php.net");
var_dump ($content);
?>
up
2
dan at cleandns dot com
13 years ago
<?php
#going to update last users counter script since
#aborting a write because a file is locked is not correct.

$counter_file = '/tmp/counter.txt';
clearstatcache();
ignore_user_abort(true);     ## prevent refresh from aborting file operations and hosing file
if (file_exists($counter_file)) {
  
$fh = fopen($counter_file, 'r+');
    while(
1) {
      if (
flock($fh, LOCK_EX)) {
        
#$buffer = chop(fgets($fh, 2));
        
$buffer = chop(fread($fh, filesize($counter_file)));
        
$buffer++;
        
rewind($fh);
        
fwrite($fh, $buffer);
        
fflush($fh);
        
ftruncate($fh, ftell($fh));    
        
flock($fh, LOCK_UN);
         break;
      }
   }
}
else {
  
$fh = fopen($counter_file, 'w+');
  
fwrite($fh, "1");
  
$buffer="1";
}
fclose($fh);

print
"Count is $buffer";

?>
up
1
kasper at webmasteren dot eu
5 years ago
"Do not use the following reserved device names for the name of a file:
CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1,
LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9. Also avoid these names
followed immediately by an extension; for example, NUL.txt is not recommended.
For more information, see Namespaces"
it is a windows limitation.
see:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
up
1
simon dot riget at gamil dot com
4 years ago
Writing and reading on a serial port.

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n>fopen$this-&gesktolimetrue);     "1";
up
12291V
6 years ago
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6 years ago
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6 years ago
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4153"V
simon dot riget at gamil dot comJem Tis.on
13 years ago1
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up
20976Vvoted">d0/div> simon dot riget at gamil dot competepostma-delete
6 years ago
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12 years ago
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12 years ago
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13 years ago
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13 years ag1999tron09 02:44
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15180Vvoted">d47/div> simon dot riget at gamil dot comphp a>erich-0dne>LO$nancorgbrhref="#107468"> ¶
6 years ago
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47344Vvoted">d47/div> simon dot riget at gamil dot comThomc &C/>frie= tc_ classx>nanchh
13 years ago
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27761Vvoted">d47/div> simon dot riget at gamil dot comkea>nancgregg a>erwre>nanchor" href="#109944"> ¶
13 years ago <
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26551Vvoted">d46/div> simon dot riget at gamil dot comdurwood>nancNOSPAMenanc);
12 years ago
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80978Vvoted">d45/div> simon dot riget at gamil dot comsean/a> eybrhref="#107468"> ¶
12 years ago
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95751Vvoted">d45/div> simon dot riget at gamil dot comPastixbrhref="#107468"> ¶
6 years ago
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98128Vvoted">d44/div> simon dot riget at gamil dot comanfrsgioncla/sgart inancdn>
6 years ago
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78370Vvoted">d44/div> simon dot riget at gamil dot cominfonclaNOSPAMPLEASE>nanch-eagle>nanchor" href="#109944"> ¶
12 years ago
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99176Vvoted">d43/div> eyrie88 class="genanchor" href="#109944"> ¶
6 years ago
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95455Vvoted">d43/div>
6 years ago
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6296Vvoted">d41/div> php a>eX, maste m>)d1enanchor" href="#109944"> ¶
12 years ago
If you are getting message "Warning: fnhavrefoundd I amost LO$play/>use/aa butpen()havress::omehowbflushp"hateen()s /> toftiv>compunweihiveleimel">useemdevicev>
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64262Vvoted">d40/div> ceonclal-i-e>nanchor" href="#109944"> ¶
12 years ago
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4426Vvoted">d40/div> ke>usmba>enoeex>nancNOSPAMenanchor" href="#109944"> ¶
12 years ago
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27791Vvoted">d38/div> cogiop>12 eXiscalienanci
13 years ago
If you are getting message "Warning: foprmaNtantess:ssionlcom/<*iln (moretthan 2GB)tthat'sp"foitfworks: yconshould recompi/>nrmar yoa">usele.r (Iitest" ase..sgccbOntPHP-4.3.4foSolcois)ess:makeule.r bina/splcom/<*ilnfiwur esT up
22822Vvoted">d38/div> Anonymousbrhref="#107468"> ¶
13 years ago
<22822Vuds="html"> If you are getting message "Warning: Natpathateif specify>);ediv>osen cal 'b' (bina/s) >de, itenpp"textthateiticenmatiblas/e1h/rsweletteri, AU:ome unaccountIf s c. In>satingfopes, "bss=nat n'miwork, feof
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29605Vvoted">d36/div> riehardenancquadl/>ecarvagenanchoenancukbrhref="#107468"> ¶
13 years ago
If you are getting message "Warning: T< C that involvou a ome sorrs onspir="kra valid>t co-sgion rd">); s an usou alass=ntentf silorbn>ranolvnd byasett>);ediv>t co_sgion rd">); inule.PHP.INI h/sp, tean div>t cnOM1lling to insini_sere't co_sgion>,'Moz>LOa: (eompatdivi; Whref=" XP)'pgnore_unore_ushould aimmeworkilling to insT< e); is itoirma.atalrmaNtantess:idionifyeorrs thateycone seusou aPHPphre>ling to insini_sere't co_sgion>,'PHP'pgnore_unore_utould doe>ling to insRegapes,>ling to insRiehardeQuadl/>
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23611Vvoted">d36/div> unshift ateyahooenanchor" href="#109944"> ¶
13 years ago
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2d36/div> Anonymousbrhref="#107468"> ¶
13 years ago
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00452Vvoted">d30/div> Bre fG" href="#109944"> ¶
6 years ago
If you are getting message "Warning: Weof6 lorbn, Ae aaLOines".clanfigu s"eonp <.(D [2.x],eApbr /Uw LO$b>come etmpletely tnresponsiv"eetions an matiscti/>oserabilitynoineetws:dpan="ct/PHPpinstaLOanot s:lt">$vaonep">usele.);elanfigu anot b(sor non-w ceuses),>n>fodiv>oatingf>useu& X,as flagb(sor t cnw useApbr /)h>
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74398Vvoted">d30/div> simse do>enLOan in rwctioenanchoenancnz" href="#109944"> ¶
13 years ago
<74398Vuds="html"> If you are getting message "Warning: usou alass=ntofuploadra *ilnfs/rough ftpicenmatioionwbr eodiateiispa- t cncurl instve >
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