変数 $tableに目的のHTML文が入るようになっています｡
JRAのﾄｯﾌﾟﾍﾟｰｼﾞからｱｸｾｽしないと目的のﾍﾟｰｼﾞに行き着かないので､ﾌﾟﾛｸﾞﾗﾑの実行に少し時間がかかります｡

<?php
// JRAｱｸｾｽ専用
function httpJRA($path, $cname) {
 $host = 'www.jra.go.jp';
 $cname = 'cname=' . urlencode($cname);
 $ln = strlen($cname);

 $request .= "POST {$path} HTTP/1.1\r\n";
 $request .= "Host: www.jra.go.jp\r\n";
 $request .= "User-Agent: Mozilla/5.0\r\n";
 $request .= "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n";
 $request .= "Accept-Language: ja,en-us;q=0.7,en;q=0.3\r\n";
 $request .= "Accept-Encoding: gzip, deflate\r\n";
 $request .= "Connection: keep-alive\r\n";
 $request .= "Referer: http://www.jra.go.jp/\r\n";
 $request .= "Cookie: style=null\r\n";
 $request .= "Content-Type: application/x-www-form-urlencoded\r\n";
 $request .= "Content-Length: {$ln}\r\n";
 $request .= "\r\n";
 $request .= "{$cname}\r\n";

 $fp = fsockopen($host, 80);
 if (!$fp) return FALSE;
 fputs($fp, $request);

 $response = "";
 while (1) {
 $str = fgets($fp);
 if (feof($fp) && ($str == FALSE)) break;
 $response .= $str;
 };
 fclose($fp);

 return $response;
}

//ﾄｯﾌﾟﾍﾟｰｼﾞ解析
function topJRA() {
 $infp = fopen('http://www.jra.go.jp', 'r');
 if ($infp == FALSE) return FALSE;
 $cname = '';
 while (! feof($infp)) {
 $str = trim(fgets($infp));
 $str = mb_convert_encoding($str, 'UTF-8', 'SJIS');
 if (preg_match("/doAction\(\'\/JRADB\/accessH\.html\',\'([0-9a-zA-Z\/]+)\'\)\">払戻金/iu", $str, $arr) > 0) {
 $cname = $arr[1];
 }
 }
 return $cname;
}

//払戻金ﾍﾟｰｼﾞ解析
function haraiJRA($cname) {
 $path = '/JRADB/accessH.html';
 $str = httpJRA($path, $cname);
 $str = mb_convert_encoding($str, 'UTF-8', 'SJIS');
 if ($str == FALSE) return FALSE;
 if (preg_match("/doAction\(\'\/JRADB\/access5\.html\',\'([0-9a-zA-Z\/]+)\'\)/iums", $str, $arr) > 0) {
 $cname = $arr[1];
 }
 return $cname;
}

//WIN5ﾍﾟｰｼﾞ解析
function win5JRA($cname) {
 $path = '/JRADB/access5.html';
 $buf = httpJRA($path, $cname);
 $buf = mb_convert_encoding($buf, 'UTF-8', 'SJIS');
 if ($buf == FALSE) return FALSE;
 $flag = FALSE;
 $str = strtok($buf, "\n");
 while ($str != FALSE) {
 if ($flag == FALSE) {
 if (preg_match("/bgcolor\=\"#D9D9B0\">\&nbsp;<\/th>/iu", $str) > 0) {
 $flag = TRUE;
 $res = "<tr>\n" . $str . "\n";
 }
 } else {
 if (preg_match("/bgcolor=\"#D9D9B0\">出走取消<br>競走除外<\/th>/iu", $str) > 0) {
 $flag = FALSE;
 break;
 } else {
 $res .= $str . "\n";
 }
 }
 $str = strtok("\n");
 }
 $ln = strlen($res);

 return substr($res, 0, $res - 5);
}

//ﾒｲﾝﾌﾟﾛｸﾞﾗﾑ
$cname = topJRA();
if ($cname == FALSE) {
 echo 'JRAのｻｲﾄに接続できません';
 exit(1);
}
$cname = haraiJRA($cname);
if ($cname == FALSE) {
 echo 'JRAのｻｲﾄに接続できません';
 exit(1);
}
$table = win5JRA($cname);
echo $table; //表の内容
?>