{"id":515,"date":"2010-08-27T13:24:24","date_gmt":"2010-08-27T13:24:24","guid":{"rendered":""},"modified":"2010-08-27T13:24:24","modified_gmt":"2010-08-27T13:24:24","slug":"515","status":"publish","type":"post","link":"https:\/\/www.poloo.org\/?p=515","title":{"rendered":"PHP \u8bfb\u53d6\u5927\u6587\u4ef6\u7684\u65b9\u6cd5"},"content":{"rendered":"

\u6700\u8fd1\u5728\u5de5\u4f5c\u4e2d\u9047\u5230\u4e86\u9700\u8981\u8bfb\u53d6\u7cfb\u7edf\u65e5\u5fd7\u7684\u95ee\u9898\uff0c\u65e5\u5fd7\u6587\u4ef6\u5f88\u5927\uff0c\u5927\u6982\u57281G\u4ee5\u4e0a\u751a\u81f3\u66f4\u5927\uff0c\u968f\u5373\u7814\u7a76\u4e86\u8bfb\u53d6\u5f97\u65b9\u6cd5\uff0c\u76f4\u63a5\u4f7f\u7528PHP\u81ea\u5e26\u7684\u51fd\u6570\u5c31\u53ef\u4ee5\u89e3\u51b3\u8fd9\u51e0\u4e2a\u95ee\u9898\uff0c\u4f46\u662f\u7edd\u5bf9\u4e0d\u80fd\u4f7f\u7528file\u548cfile_get_contents\uff0c\u8fd9\u4e24\u4e2a\u51fd\u6570\u662f\u4e00\u6b21\u6027\u5c06\u6587\u4ef6\u5168\u90e8\u52a0\u8f7d\u8fdb\u6765\uff0c\u5982\u679c\u6587\u4ef6\u5728\u51e0\u5341M \u8fd8\u662f\u53ef\u4ee5\u7684\uff0c\u4f46\u662f\u7a0d\u5927\u7684\u6587\u4ef6\u65f6\u4e0d\u80fd\u7528\u7684\uff0c\u5185\u5b58\u662f\u4f1a\u6ea2\u51fa\u7684\uff0c<\/p>\n


<?
\/**<\/p>\n

* PHP \u8bfb\u53d6\u5927\u6587\u4ef6 \u6d4b\u8bd5\u6587\u4ef6\u5927\u4e8e1G\u7684\u6587\u672c\u6587\u4ef6<\/p>\n

*\/<\/p>\n

\/**<\/p>\n

* \u6587\u4ef6\u8bfb\u53d6<\/p>\n

*<\/p>\n

* @param String $filename \u6587\u4ef6\u5730\u5740<\/p>\n

* @param Int $count \u8bfb\u53d6\u5f97\u884c\u6570<\/p>\n

* @param String $sep \u6bcf\u884c\u7684\u5206\u9694\u6807\u8bb0<\/p>\n

* @return String \u8fd4\u56de\u7ed3\u679c<\/p>\n

*\/<\/p>\n

function readBigFile($filename, $count = 20, $tag = \u201c
\n\u201d) {<\/p>\n

    $content = \u201d;\/\/\u6700\u7ec8\u5185\u5bb9<\/p>\n

    $_current = \u201d;\/\/\u5f53\u524d\u8bfb\u53d6\u5185\u5bb9\u5bc4\u5b58<\/p>\n

    $step= 1;\/\/\u6bcf\u6b21\u8d70\u591a\u5c11\u5b57\u7b26<\/p>\n

    $tagLen = strlen($tag);<\/p>\n

    $start = 0;\/\/\u8d77\u59cb\u4f4d\u7f6e<\/p>\n

    $i = 0;\/\/\u8ba1\u6570\u5668<\/p>\n

    $handle = fopen($filename,\u2019r+\u2019);\/\/\u8bfb\u5199\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\uff0c\u6307\u9488\u6307\u5411\u6587\u4ef6\u5934<\/p>\n

    while($i < $count && !feof($handle)) {    \/\/\u6587\u4ef6\u6ca1\u6709\u5230\u7ed3\u5c3e\u548c\u5c0f\u9c7c\u9700\u8981\u8bfb\u53d6\u5f97\u884c\u6570\u65f6<\/p>\n

        fseek($handle, $start, SEEK_SET);\/\/\u6307\u9488\u8bbe\u7f6e\u5728\u6587\u4ef6\u5f00\u5934<\/p>\n

        $_current = fread($handle,$step);\/\/\u8bfb\u53d6\u6587\u4ef6<\/p>\n

        $content .= $_current;\/\/\u7ec4\u5408\u5b57\u7b26\u4e32<\/p>\n

        $start += $step;\/\/\u4f9d\u636e\u6b65\u957f\u5411\u524d\u79fb\u52a8<\/p>\n

        \/\/\u4f9d\u636e\u5206\u9694\u7b26\u7684\u957f\u5ea6\u622a\u53d6\u5b57\u7b26\u4e32\u6700\u540e\u514d\u5f97\u51e0\u4e2a\u5b57\u7b26<\/p>\n

        $substrTag = substr($content, -$tagLen);<\/p>\n

        if ($substrTag == $tag) {    \/\/\u5224\u65ad\u662f\u5426\u4e3a\u5224\u65ad\u662f\u5426\u662f\u6362\u884c\u6216\u5176\u4ed6\u5206\u9694\u7b26<\/p>\n

            $i++;<\/p>\n

        }<\/p>\n

    }<\/p>\n

    \/\/\u5173\u95ed\u6587\u4ef6<\/p>\n

    fclose($handle);<\/p>\n

    \/\/\u8fd4\u56de\u7ed3\u679c<\/p>\n

    return $content;<\/p>\n

}<\/p>\n

$filename = \u2018E:\/2010log.log\u2019;\/\/\u9700\u8981\u8bfb\u53d6\u7684\u6587\u4ef6<\/p>\n

$tag = \u201c
\n\u201d;\/\/\u884c\u5206\u9694\u7b26 \u6ce8\u610f\u8fd9\u91cc\u5fc5\u987b\u7528\u53cc\u5f15\u53f7<\/p>\n

$count = 20;\/\/\u8bfb\u53d6\u884c\u6570<\/p>\n

$data = readBigFile($filename,$count,$tag);<\/p>\n

echo $data;<\/p>\n

?>
<\/code><\/p>\n

PHP\u8fd8\u6709\u5176\u4ed6\u65b9\u6cd5\u80fd\u591f\u89e3\u51b3\uff0c\u6bd4\u5982system\u51fd\u6570\uff0c<\/p>\n","protected":false},"excerpt":{"rendered":"

\u6700\u8fd1\u5728\u5de5\u4f5c\u4e2d\u9047\u5230\u4e86\u9700\u8981\u8bfb\u53d6\u7cfb\u7edf\u65e5\u5fd7\u7684\u95ee\u9898\uff0c\u65e5\u5fd7\u6587\u4ef6\u5f88\u5927\uff0c\u5927\u6982\u57281G\u4ee5...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-515","post","type-post","status-publish","format-standard","hentry","category-Php"],"_links":{"self":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/515","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=515"}],"version-history":[{"count":0,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/515\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=515"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=515"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}