PHP 例解，第 2 部分

33^Great New Products This Year^/images/proddemo.jpg^Thursday's product demo ...
12^Opening Event Well Attended^/images/opnfoto.jpg^Ticket sales to the ...
5^Trade Show Opens^/images/tradelogo.gif^The Fourth Annual Trade Show ...
                

for ($i=0; $i<$numstories; $i++) {
 $storyinfo = split("\^", $stories[$i]);
 $storynum = $storyinfo[0]; // 故事编号（例如 33）
 $storydesc = $storyinfo[1]; // 故事标题（例如 "Great New Products This Year"）。
 $storyimg = $storyinfo[2]; // 图像 URL（例如 "/images/proddemo.jpg"）。
 $dtext = $storyinfo[3]; // 故事摘要（更长的文本说明）。
 $url = "<a href=\"index.php3?topic=$topic&story=$storynum\">$storydesc</a><br>";
 if ($i<10) {
 $url = "<h2>" . $url . "</h2>";
 if ($storyimg != "") {
 $url = "<p><img align=" . ($i%2==1 ? "right" : "left")
 . " src=\"$storyimg\"></p>\n"
 . $url;
 }
 $url = "<hr>" . $url;
 } else {
 $url = "<h3>" . $url . "</h3>";
 }
 echo("$url\n");
 echo("<p>$dtext</p>\n");
}
                

<hr><p><img align=left src="/images/proddemo.jpg"></p>
<h2><a href="index.php3?topic=TradeShow&story=33">Great New Products This Year</a><br></h2>
<p>Thursday's product demo included a couple of exciting new
surprises from competing firms in the industry.</p>
<hr><p><img align=right src="/images/opnfoto.jpg"></p>
<h2><a href="index.php3?topic=TradeShow&story=12">Opening Event Well Attended</a><br></h2>
<p>Ticket sales to the Trade Show opening event were
up 15% from last year's show.</p>
<hr><p><img align=left src="/images/tradelogo.gif"></p>
<h2><a href="index.php3?topic=TradeShow&story=5">Trade Show Opens</a><br></h2>
<p>The Fourth Annual Trade Show opened 10/11/2000 to an enthusiastic reception
from attendees.</p>
                

//通知用户输入问题。
 function complain($problem) {
 global $status;
 if ($status != "") $status = $status . "<br>\n";
 $status = $status . $problem;
 }
                

//在一个现有文件的开头添加一行新内容。
 function prepend($file,$string) {
 // 有待改进 ? 使用数据库提高这个算法的可伸缩性。
 // 目前限制为 100 个故事。
 if (file_exists($file)) {
 $filetext = file($file);
 $lines = count($filetext);
 } else {
 $lines = 0;
 }
 if ($lines > 100) $lines = 100;
 $handle = fopen($file,"w");
 fputs ($handle, "$string\n");
 for ($i=0; $i<$lines; $i++)
 fputs ($handle, $filetext[$i]);
 fclose ($handle);
 }
                

$entry = "$storynum^$storytitle^$storyimg^$synopsis";
                

 prepend("Main.txt",$entry);
 $topicfile = "$subject.txt";
 prepend($topicfile,$entry);
                

 // 选择性安全！将大多数 HTML 标记转换为文本。
 $storytext = eregi_replace("<", "<", $storytext);
 $storytext = eregi_replace("<b>", "<b>", $storytext);
 $storytext = eregi_replace("<i>", "<i>", $storytext);
                

if ($submit == "Submit") {
 $status = "";
 if (!isset($storyimg)) $storyimg = "$subject.gif";
 validate("Subject",$subject,1);
 validate("Story Title",$storytitle,10);
 validate("Synopsis",$synopsis,50);
 validate("Story Text",$storytext,300);
 if ($status == "") {
 $status = "complete";
 save();
 }
 }