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Binary-safe file write
(PHP 4, PHP 5)
Example 651. A simple fwrite() example<?phpRelated Examples ( Source code ) » fwrite Examples ( Source code ) » fgetss Gets line from file pointer and strip HTML tags Examples ( Source code ) » Encoding Data Examples ( Source code ) » Writing and Appending Content in a File Examples ( Source code ) » Write content to file Examples ( Source code ) » Writing and Appending to a File Examples ( Source code ) » stream_filter_append Examples ( Source code ) » Write string to text file Examples ( Source code ) » How to add text to the file Examples ( Source code ) » File based page counter Examples ( Source code ) » Feed Validator Examples ( Source code ) » Simple Google Site Map Generator Code Examples / Notes » fwriteseeker
[[Editors note: There is no "prepend" mode, you must essentially rewrite the entire file after prepending contents to a string. Perhaps you will use file(), modify, implode(), then fopen()/fwrite() it back]] To put strings into the front of the file, you need to set place the pointer at the top of the file when openning the file with fopen(), see fopen() for more info. bahatest
[Editor's Note: No, you only need to use this if you want a BOM (Byte order mark) added to the document - most people do not.] if you have to write a file in UTF-8 format, you have to add an header to the file like this : <?php $f=fopen("test.txt", "wb"); $text=utf8_encode("éaè!"); // adding header $text="\xEF\xBB\xBF".$text; fputs($f, $text); fclose($f); ?> andi
[Ed. Note: The runtime configuration setting auto_detect_line_endings should solve this problem when set to On.] I figured out problems when writing to a file using \r as linebreak, after that file() wasn't able to read the data from that file. Using \n solved the problem. bluevd
Watch out for mistakes in writting a simple code for a hit counter: <?php $cont=fopen('cont.txt','r'); $incr=fgets($cont); //echo $incr; $incr++; fclose($cont); $cont=fopen('cont.txt','a'); fwrite($cont,$incr); fclose($cont); ?> Why? notice the second fopen -> $cont=fopen('cont.txt','a'); it opens the file in writting mode (a). And when it ads the incremented value ( $incr ) it ads it ALONG the old value... so opening the counter page about 5 times will make your hits number look like this 012131214121312151.21312141213E+ .... you get the piont. nasty, isn't it? REMEMBER to open the file with the 'w' mode (truncate the file to 0). Doing this will clear the file content and it will make sure that your counter works nice. This is the final code <?php $cont=fopen('cont.txt','r'); $incr=fgets($cont); //echo $incr; $incr++; fclose($cont); $cont=fopen('cont.txt','w'); fwrite($cont,$incr); fclose($cont); ?> Notice that this work fine =) XU (alias Iscu Andrei) will
Using fwrite to write to a file in your include folder... PHP does not recognise the permissions setting for the file until you restart the server... this script works fine. (still have to create the blank text file first though...it is not created automatically) On OS X Server.. Using the 1 in fopen tells php to look for the file in your include folder. Change your include folder by altering include_path in php.ini On OS X Server, php.ini is in private/etc/php.ini.default copy the file and call it php.ini the default include path is usr/lib/php (All these folders are hidden - use TinkerTool to reveal them) <?php $file = fopen('textfile.txt', 'a', 1); $text="\n Your text to write \n ".date('d')."-".date('m')."-".date('Y')."\n\n"; fwrite($file, $text); fclose($file); ?> zaccraven
Use this to get a UTF-8 Unicode CSV file that opens properly in Excel: $tmp = chr(255).chr(254).mb_convert_encoding( $tmp, 'UTF-16LE', 'UTF-8'); $write = fwrite( $filepath, $tmp ); Use a tab character, not comma, to seperate the fields in the $tmp. Credit for this goes to someone called Eugene Murai, I found this solution by him after searching for several hours. jake roberts
Use caution when using: $content = fread($fh, filesize($fh)) or die "Error Reading"; This will cause an error if the file you are reading is zero length. Intead use: if ( false === fread($fh, filesize($fh)) ) die "Error Reading"; Thus it will be successful on reading zero bytes but detect and error returned as FALSE. santibari
To write a specific byte into a file (let's,say 0000 0001), use the function chr(). <?php fputs($fp,chr(0x01),1); ?> albert;cutthis;
To write 'true binary' files combine with pack() : $a = 65530; $fp = fopen('test.dat', 'w'); fwrite($fp, pack('L', $a)); fclose($fp); chaobreederxl
This is a simple function I wrote that uses the fopen and fwrite functions to log the actions of users... very useful for tracking your members on your site. <?php function loguser($reason,$ext = "db"){ if(!is_dir("logs")): mkdir("logs","0493"); endif; $fp = fopen("logs/".date("m-d-y").".".$ext, "a+"); fwrite($fp, "<strong>".date("g:i:s A")."</strong>: ".$reason."<br/>"); } ?> To use this, just call the function like so: <? loguser($_SERVER["REMOTE_ADDR"]." attempted to create another account.","html"); ?> The second parameter can be changed to anything that would support HTML. If you leave out the second extension, then it automatically uses the .db extension, which works excellent for me. Hope this helps. Paul chedong
the fwrite output striped the slashes if without length argument given, example: <?php $str = "c:\\01.txt"; $out = fopen("out.txt", "w"); fwrite($out, $str); fclose($out); ?> the out.txt will be: c:^@1.txt the '\\0' without escape will be '\0' ==> 0x00. the correct one is change fwrite to: fwrite($out, $str, strlen($str)); chad 0x40 herballure 0x2e com
Remember to check the return value of fwrite(). In particular, writing into a socket can return fewer bytes than requested, and you'll have to try again with the remainder of your data.
chill
In PHP 4.3.7 fwrite returns 0 rather than false on failure. The following example will output "SUCCESS: 0 bytes written" for existing file test.txt: $fp = fopen("test.txt", "rw"); if (($bytes_written = fwrite($fp, "This is a test")) === false) { echo "Unable to write to test.txt\n\n"; } else { echo "SUCCESS: $bytes_written bytes written\n\n"; } sheyh
if you want to create quickly and without fopen use system, exec system('echo "blahblah" > /path/file'); kzevian
I needed to append, but I needed to write on the file's beginning, and after some hours of effort this worked for me: $file = "file.txt"; if (!file_exists("file.txt")) touch("file.txt"); $fh = fopen("file.txt", "r"); $fcontent = fread($fh, filesize("file.txt")); $towrite = "$newcontent $fcontent"; $fh22 = fopen('file.txt', 'w+'); fwrite($fh2, $towrite); fclose($fh); fclose($fh2); james
I could'nt quite get MKP Dev hit counter to work.... this is how I modified it <? function hitcount() { $file = "counter.txt"; if ( !file_exists($file)){ touch ($file); $handle = fopen ($file, 'r+'); // Let's open for read and write $count = 0; } else{ $handle = fopen ($file, 'r+'); // Let's open for read and write $count = fread ($handle, filesize ($file)); settype ($count,"integer"); } rewind ($handle); // Go back to the beginning /* * Note that we don't have problems with 9 being fewer characters than * 10 because we are always incrementing, so we will always write at * least as many characters as we read **/ fwrite ($handle, ++$count); // Don't forget to increment the counter fclose ($handle); // Done return $count; } ?> php
Hope this helps other newbies. If you are writing data to a txt file on a windows system and need a line break. use \r\n . This will write hex OD OA. i.e. $batch_data= "some data... \r\n"; fwrite($fbatch,$batch_data); The is the equivalent of opening a txt file in notepad pressing enter and the end of the line and saving it. cutmaster
For those who, like me, lost a lot of minutes (hours) to understand why fwrite doesn't create a real utf-8 file, here's the explanation I've found : I tried to do something like this : <?php $myString = utf8_encode("Test with accents éèà ç"); $fh=fopen('test.xml',"w"); fwrite($fh,$myString); fclose($fh); ?> For a mysterious reason, the resulted file shows the accent without the utf-8 conversion. I tried the binary, mode, etc. etc. And finally I've found it : It seems that fwrite NEEDS to have the utf8_encode function INSIDE its parameters like this, to understand it must create a non-text only file : <?php $myString = "Test with accents éèà ç"; $fh=fopen('test.xml',"w"); fwrite($fh,utf8_encode($myString)); fclose($fh); ?> Hope this will help chris blown
Don't forget to check fwrite returns for errors! Just because you successfully opened a file for write, doesn't always mean you can write to it. On some systems this can occur if the filesystem is full, you can still open the file and create the filesystem inode, but the fwrite will fail, resulting in a zero byte file. goodwork
difficulty appending to file in SAFE MODE ON if you are getting resource errors etc try this... $textline="whatever string you submitted or created"; $filename="afilename.log"; // or whatever your path and filename if (!$handle = fopen($filename, 'a')) { echo "Cannot open file ($filename)"; // or handle your error exit; } $textline.="\n"; // dont forget that period // now write content to our opened file. IF (fwrite($handle,$textline) === FALSE) {echo "Cannot write to file ($filename)";// or handle your error exit;} echo "Success, wrote ($textline) to file ($filename)"; fclose($handle); mkp dev
bluevd at gmail dot com mentioned a hit counter. In his/her implementation, the file is first opened, read, closed, then opened +truncated, then written, and closed again. An alternative to this is: <?php $file = 'counter.txt or whatever'; $handle = fopen ($file, 'r+'); // Let's open for read and write $count = int (fread ($handle, filesize ($file))); // We don't want to think it's a string and try appending echo "Number of hits $count"; rewind ($handle); // Go back to the beginning /* * Note that we don't have problems with 9 being fewer characters than * 10 because we are always incrementing, so we will always write at * least as many characters as we read **/ fwrite ($handle, ++$count); // Don't forget to increment the counter fclose ($handle); // Done ?> |
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 |
