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Digg fscanf
Parses input from a file according to a format
(PHP 4 >= 4.0.1, PHP 5)
The function fscanf() is similar to sscanf(), but it takes its input from a file associated with handle and interprets the input according to the specified format, which is described in the documentation for sprintf().
Any whitespace in the format string matches any whitespace in the input
stream. This means that even a tab Return ValuesIf only two parameters were passed to this function, the values parsed will be returned as an array. Otherwise, if optional parameters are passed, the function will return the number of assigned values. The optional parameters must be passed by reference. ChangeLog
ExamplesExample 646. fscanf() Example<?phpExample 647. Contents of users.txtjavier argonaut peRelated Examples ( Source code ) » fscanf Examples ( Source code ) » Read text file with format Code Examples / Notes » fscanfworldwideroach
Yet another function to read a file and return a record/string by a delimiter. It is very much like fgets() with the delimiter being an additional parameter. Works great across multiple lines. function fgetd(&$rFile, $sDelim, $iBuffer=1024) { $sRecord = ''; while(!feof($rFile)) { $iPos = strpos($sRecord, $sDelim); if ($iPos === false) { $sRecord .= fread($rFile, $iBuffer); } else { fseek($rFile, 0-strlen($sRecord)+$iPos+strlen($sDelim), SEEK_CUR); return substr($sRecord, 0, $iPos); } } return false; } loco.xxx
to include all type of visible chars you should try: fscanf($file_handler,"%[ -~]"); bertrand dot lecun
It would be great to precise in the fscanf documentation that one call to the function, reads a complete line. and not just the number of values defined in the format. If a text file contains 2 lines each containing 4 integer values, reading the file with 8 fscanf($fd,"%d",$v) doesnt run ! You have to make 2 fscanf($fd,"%d %d %d %d",$v1,$v2,$v3,$v4); Then 1 fscanf per line. eugene
If you want to read text files in csv format or the like(no matter what character the fields are separated with), you should use fgetcsv() instead. When a text for a field is blank, fscanf() may skip it and fill it with the next text, whereas fgetcsv() correctly regards it as a blank field.
arentzen
If you want fscanf()to scan one variable in a large number of lines, e.g an Ipadress in a line with more variables, then use fscanf with explode() <? $filename = "somefile.txt"; $fp = fopen($filename, "r") or die ("Error opening file! \n"); $u = explode(" ",$line); // $u is the variable eg. an IPadress while ($line = fscanf($fp,"%s",$u)) { if(preg_match("/^$u/",$_SERVER['REMOTE_ADDR'])) {$badipadresss++;} // do something and continue scan } ?> Besides, fscanf()is much faster than fgets() me
I have a simpler method I use to parse delimited text. Using the data posted by gozer at fanhunter dot com, here is my script. Maybe it is faster? <?php $fp = fopen ("sections.dat","r"); if (!$fp) {echo " Unable to open remote file."; exit;} while (!feof($fp)): $line = fgets($fp, 2048); $out = array($line); list ($id, $name, $description, $language, $directory, $id_uplevel, $order, $hassubsection) = split ("\|", $out[0]); echo "$id-$name-$description-$language-$directory- $id_uplevel-$order-$hassubsection<br />\n"; $fp++; endwhile; fclose($fp); ?> Notes: Avoid the php extension on a data file - it will cause PHP to parse the file, but there is no PHP in it. The "2048" value on line 2 of the loop is set for long lines. 1024 works fine, but I had to increase it with a large database I use a similar script to read. You don't need to open and close the speech marks (as in gozer at fanhunter dot com's example) in the echo line, just use the variables inbetween the dashes. (Remove the line break halfway through the echo line - it is just there for this forum.) rudigreen
I have a function for reading delimited files, it works for multiple lines too (i think...) <? //$fh - is the file pointer //$delim - is the seperator //$callback - self explanatory //$len - optional function file_read_delim($fh,$delim,$callback,$len=1024) { $rec = ''; while(!feof($fh)) { $buf = fread($fh,$len); if(strpos($buf,$delim) === false) { $rec .= $buf; } else { $strs = explode($delim,$buf); foreach ($strs as $ele) { $rec .= $ele; call_user_func($callback,$rec); $rec = ''; } } } } //Here is an example how to use the function $fh = fopen($filename,'r'); if(!$fh) { die 'Could not open file for reading'; } //call the function file_read_delim($fh,'-','cb'); fclose($fh); function cb($rec) { echo "$rec \n"; } ?> gozer
Hi, A few days ago we got multiple mySQL crashes due to a hardware failure and other processes running. While we thought it could be the mySQL daemon overloaded, we started looking for alternate ways to get our little databases working so we started using fscanf to parse files. We ran into multiple problems due to the whitespace and other characters that were in our database. Finally, we made it to work using sets as james@zephyr-works.com remarked. Our final function is: function get_sections($include_dir){ $filename = $include_dir . "sections.dat.php"; $datafile = fopen ($filename ,"r"); while ($sectioninfo = fscanf ($datafile, "%[0-9]|%[a-zA-Z0-9@&;:,. /!?-]|%[a-zA-Z0-9@&;:,. /!?-]|%[a-zA-Z]|%[a-zA-Z0-9@/?&;.+=-]|%[0-9]|%[0-9]|%[0-9]\n")) { list($id, $name, $description, $language, $directory, $id_uplevel, $order, $hassubsection) = $sectioninfo; // Show output echo $id . "-" . $name. "-" . $description . "-" . $language . "-" . $directory . "-" . $id_uplevel . "-" . $order . "-" . $hassubsection . " \n"; } fclose($datafile); } The contents of sections.dat.php (for example): 1|home|Página principal de Fanhunter.|castellano|==|0|0|0 2|fanhunter|Sección principal dedicada al universo Fanhunter.|castellano|fanhunter/|1|0|0 3|outfan|Sección principal dedicada al universo Outfan.|castellano|outfan/|1|0|0 4|fanpiro|Sección principal dedicada al universo Fanpiro.|castellano|fanpiro/|1|0|0 5|tienda|La tienda de Fanhunter.|castellano|tienda/|1|0|0 6|the zone|Sección principal Miscelánea.|castellano|thezone/|1|0|0 7|flfcn|Sección principal dedicada a Fan Letal/Fan con Nata.|castellano|fanletal/|1|0|0 8|foro|Nuestro foro de discusión.|castellano|foro/|1|0|0 9|chat|Sección para chatear.|castellano|chat/|1|0|0 10|links|Sección recopilatoria de enlaces de interés a otras páginas.|castellano|links/|1|0|0 Note: The '==' in directory means no directory needed to be specified. Pay attention to linebreaks, as this forum puts some of them into the code I pasted. Good luck guys. james
fscanf works a little retardedly I've found. Instead of using just a plain %s you probably will need to use sets instead. Because it works so screwy compared to C/C++, fscanf does not have the ability to scan ahead in a string and pattern match correctly, so a seemingly perfect function call like: fscanf($fh, "%s::%s"); With a file like: user::password Will not work. When fscanf looks for a string, it will look and stop at nothing except for a whitespace so :: and everything except whitespace is considered part of that string, however you can make it a little smarter by: fscanf($fh, "%[a-zA-Z0-9,. ]::%[a-zA-Z0-9,. ]" $var1, $var2); Which tells it that it can only accept a through z A through Z 0 through 9 a comma a period and a whitespace as input to the string, everything else cause it to stop taking in as input and continue parsing the line. This is very useful if you want to get a sentence into the string and you're not sure of exactly how many words to add, etc. yasuo_ohgaki
For C/C++ programmers. fscanf() does not work like C/C++, because PHP's fscanf() move file pointer the next line implicitly. ruiner911
Clear the variables before you scan them in. As a programmer this should have been very apparent. Goof.
robert
actually, instead of trying to think of every character that might be in your file, excluding the delimiter would be much easier. for example, if your delimiter was a comma use: %[^,] instead of: %[a-zA-Z0-9.| ... ] Just make sure to use %[^,\n] on your last entry so you don't include the newline. matt
A better way to use fscanf() would be this: <?php $handle = fopen("users.txt", "r"); while (!feof($handle)) { $userinfo = fscanf($handle, "%s\t%s\t%s\n"); if ($userinfo) { list ($name, $profession, $countrycode) = $userinfo; //... do something with the values } $userinfo=NULL; } fclose($handle); ?> as you can see, instead of waiting for fscanf() to fail to return a value... it waits for the the pointer to get to the end of the file... this way, if for some reason one of your lines does not match your expression, it will not kill the loop. it will simply go on to the next line. |
Change Language
basename chgrp chmod chown clearstatcache copy delete dirname disk_free_space disk_total_space diskfreespace fclose feof fflush fgetc fgetcsv fgets fgetss file_exists file_get_contents file_put_contents file fileatime filectime filegroup fileinode filemtime fileowner fileperms filesize filetype flock fnmatch fopen fpassthru fputcsv fputs fread fscanf fseek fstat ftell ftruncate fwrite glob is_dir is_executable is_file is_link is_readable is_uploaded_file is_writable is_writeable lchgrp lchown link linkinfo lstat mkdir move_uploaded_file parse_ini_file pathinfo pclose popen readfile readlink realpath rename rewind rmdir set_file_buffer stat symlink tempnam tmpfile touch umask unlink |
