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Manual: fread
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  Updated
Sat, 12 Aug 2000
 fscanf 
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fread

(PHP3 , PHP4 )

fread -- バイナリ・モードでファイルを読み込む

説明

string fread (int fp, int length)

fread()はfpが指す ファイルポインタから最高lengthバイト 読み込みます。読み込みは、lengthバイト分 読み込まれたか、EOFに達したかのいずれか早い方の事象により中止 されます。 


// ファイルの中身を読んで文字列に格納する
$filename = "/usr/local/something.txt";
$fd = fopen ($filename, "r");
$contents = fread ($fd, filesize ($filename));
fclose ($fd);

fwrite(), fopen(), fsockopen(), popen(), fgets(), fgetss(), fscanf(), file(), fpassthru() も参照下さい。


User Contributed Notes: fread

"Elliot English"<webmaster@mlplus.com>
17-Aug-1999 12:44
make it so that the command does not require a length specifier instead it reads the whole file. Also make it so that in a third property it can read froma specified position.

studioq@chorus.net
29-Aug-1999 07:37
Yes you can read an entire file with fread(). Just use the string "filesize" as an argument. Like this:
$body = fread($fhandle,filesize($textfile));
Be sure to open the file with fopen() and close it with fclose(). Else massive memory use will result.

sRp@portico.org
05-Sep-1999 06:50
The above doesn't work for url based files though, which would be a very handy thing to have. (not the filesize, but the grabbing everything with one fread.)

ben1@atlantys.net
11-Sep-1999 06:15
I want make a script of comparison for a login and a pass for enter in a Member Page. But when I add most of one login and one pass the script doesn't found the first logib and pass or the new login and pass ... How can I put a lot of login and pass ? (it's on two file : login.txt and pass.txt)
I put my script here for know if It's wrong.
$filename="login.txt"
$filename2="pass.txt"
$fd=fopen("$filename","r")
$login2=fread($fd,filesize($filename))
$fd2=fopen("filename2","r")
$pass2=fread($fd2,filesize($filename2))
if(strstr($login,"$login2")) {
if(strstr($pass,"$pass2")) {
echo "Welcome to the Member Page"
} else {
echo "Bad Login Go Back"
}
} else {
echo "Bad Login Go Back"
}

ray7th@teleport.com
09-Nov-1999 02:18
I am trying to use the fread() function to read an XML-like file, sort of a homegrown parser. The files and code samples are below.
The output is stripped of the "tags" I had planned to use to parse for and grab the values between. When I change the file name to a olumnar-
formatted text file, the output is has white spaces truncated, and appears as it should be. HOW CAN I AVOID THE TAG STRIPPING USING fread()?

>>> SAMPLE CODE below:
$CongressXml = "congress.xml";
if ( file_exists ( $CongressXml ) ) {
$fp = fopen ( $CongressXml, 'r' ) or die( "Cannot open congress.xml" );
$buffer = fread( $fp, filesize( $CongressXml ) );
fclose( $fp );
$LenOfBuffer = StrLen( $buffer );
$iEndPos = 0;
$iStartPos = 0;
} else {
echo "Missing congress.xml";
}

>>> congress.xml sample below:
<REPRESENTATIVE>
<STATE>AK</STATE>
<FULLNAME>Alaska</FULLNAME>
<LASTNAME>Young</LASTNAME>
<FIRSTNAME>Don</FIRSTNAME>
<DISTRICT>AL</DISTRICT>
<PARTY>R</PARTY>
<EMAIL>Don.Young@mail.house.gov</EMAIL>
</REPRESENTATIVE>

>>> Sample output from fread() of congress.xml:
AK Alaska Young Don AL R Don.Young@mail.house.gov AL Alabama
Callahan Sonny 1 R sonny.callahan@mail.house.gov AL Alabama Everett Terry 2
R Terry.Everett@mail.house.gov AL Alabama Riley Bob 3 R

>>> congressemails.txt sample below:
AK R Stevens, Ted Senator_Stevens@stevens.senate.gov
*AK R Murkowski, Frank http://murkowski.senate.gov/webmail.html
AL R Sessions, Jeff senator@sessions.senate.gov
AL R Shelby, Richard senator@shelby.senate.gov

>>> Sample output from fread() of congressemails.txt:
AK R
Stevens, Ted Senator_Stevens@stevens.senate.gov *AK R Murkowski, Frank
http://murkowski.senate.gov/webmail.html AL R Sessions, Jeff
senator@sessions.senate.gov AL R Shelby, Richard senator@shelby.senate.gov
AR D Lincoln, Blanche blanche_lincoln@lincoln.senate.gov AR R Hutchinson,

jeichorn@mail.com
02-Dec-1999 01:36
For url based files try using implode for example
$string = implode("\n", file("http://www.foobar.com"));

ethanh@pushgroup.net
14-Jan-2000 06:49
For reading from a specified point in the file, use:
<pre>
$fp=fopen("$filename","r");
fseek($fp,$numpoint);
$content=fread($fp,filesize("$filename"));
fclose($fp);
</pre>
For doing the same with an url-based file, use jeichorn@mail.com's solution and <pre>substr</pre> it.

nv@mindimage.net
03-Feb-2000 03:54
how do i extract a specified position, like i am opening /etc/namedb/header and want to extract the Serial to $ser can anyone help me what would be the best way todo that ?

waldemar.moll@mail.terranet.de
23-Feb-2000 06:40
Does anyone know a solution for reading a binary file and convert bytes 48 up to 51 (4 Bytes) into a decimal number?
Rembering that decimal numbers are stored in the order: LowByte - Highbyte which means that the hex number 00000C48 ist stored 48 0c 00 00.
Thanks for every hint!

kirbyt@yahoo.com
01-Apr-2000 08:31
Use -1 as the length arg if you want to read until EOF. This work for remote reads also.

shaolin_p@pi.be
23-Apr-2000 07:00
If I write somethins to a file from a form, then it writes on every line. But when I want to read the file and display it, all the text is shown in one line, how can I display the file like it really is?

zorttroz78@hotmail.com
27-Apr-2000 10:25
Could somebody write an example of how to find out the number of bytes in an URL-based file?

For example, I want to find out if a file is empty or if it has characters in it. If the file is not empty, I would like to output the file. If the file is empty (or what I believe is a byte size of 1) then do nothing.



joe@koontz.net
19-Jul-2000 09:57
try this:
<PRE>
&lt;?
$fp = fopen("file.x","r");
$buff = fread($fp,1000000);
Header("Content-Type: application/x-octet-stream");
// you can put the header file-length here but I never use it!
Header( "Content-Disposition: attachment; filename=evaluation.fdf");
echo $buff;
?>
</PRE>
this will trigger the download action.
joe



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 fscanf 
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