| PHPˤ륫ȥեI/O |
WebȤˤ륵СɥץȽǤ롢 Ǥݥԥ顼ǼڤʵǽǤ PHPǤ⥫ȤǤ PHPˤեI/OΥץȤƤꤴʤΤǡ ǺܤƤߤޤ
<html><head>
<meta http-equiv="Context-Type" content="text/html;charset=euc-jp">
<title>Υץ</title>
</head>
<body bgcolor="white">
<?
/*
* եɤߡ1Ŀʤᡢ֤ͤޤ
* 顼ȯ$errorMessageƤåȤ-1֤ޤ
*/
function readCounter($counterFileName, $errorMessage){
if(file_exists($counterFileName)){
/* ե뤬¸ߤ */
if(($fin = fopen($counterFileName, "r")) == FALSE){
$errorMessage = "ե뤬ץǤޤ$counterFileName";
return -1;
}
/* ɤꥪץ(ͭå) */
if(flock($fin, LOCK_SH) == FALSE){
$errorMessage = "ե뤬åǤޤ$counterFileName";
return -1;
}
$buf = fgets($fin, 256);
$value = (int) $buf;
$value++;
/* å */
flock($fin, LOCK_UN);
fclose($fin);
}
else{
/* ե뤬¸ߤʤ */
$value = 1;
}
/* ߥץ(¾å) */
if(($fout = fopen($counterFileName, "w")) == FALSE){
$errorMessage = "ե뤬ץǤޤ$counterFileName";
return -1;
}
if(flock($fout, LOCK_EX) == FALSE){
$errorMessage = "ե뤬åǤޤ$counterFileName";
return -1;
}
/* PHPǤϡfputsfwriteƱΤǤ */
fputs($fout, (string) $value);
flock($fout, LOCK_UN);
fclose($fout);
return $value;
}
?>
<?
$counter = readCounter("counter.dat", &$errorMessage);
if($counter == -1){
print "顼$errorMessage<br>";
}
else{
print "褦ʤ" . (string) $counter .
"ܤΤͤǤ<br>";
}
?>
</body></html>
|
եI/O˴ؤPHPȤ߹ߴؿ̾
ȤϣøΤˤ褯Ƥޤ
fopenfclosefgetsfputsλȤϣø줫ưפ䤬Ǥ礦
fopen˼ԤͤNULL˥ƥFALSE֤ޤ
ޤfwritefputsPHPǤƱΤǤ
¾˴ĤݥȤޤե뤬¸ߤ뤫Ĵ٤ˤ
file_existsؿȤޤ
is_fileϥե뤬¸ߤʤȥ顼ȯΤǡ
ŪΤˤϻȤޤ
ʣ饤ȤƱߤˤäƥե뤬˲Τɤˡ
WebץꥱǤɬθʤƤϤʤΤեΥå(¾)
ǤPerlʤɤȤäCGIǤϡ
ߡΥե뤳ȤǥåԤΤŪǤ
PHPǤPOSIXɸOS٥ΥåȤ߹ߴؿ
flockѤǤ褦ˤʤäƤޤ
ǽΰåեϥɥ롢ΰǡ
- LOCK_SH(ͭåɤ߹ߥץΤȤϰ̤ˤ)
- LOCK_EX(¾åߥץΤȤϰ̤ˤ)
- LOCK_UN(å)
ʤ1read¾ˡեΤfreadؿɤˡȤޤ ץϼΤ褦ˤʤޤ
$filename = "/the/path/of/contents.txt";
$fd = fopen ($filename, "r");
if(! $fd){ die("Error!"); }
$contents = fread ($fd, filesize ($filename));
fclose ($fd);
|
(first uploaded 2001/12/24 last updated 2002/11/08, MISUMI URANO)