7.20php文件緩存
阿新 • • 發佈：2018-07-21
第一次 sele dump add .html ctype clas mysqli nal
<?php $filename = "./jingtai.html";//定義一個變量來存放一個緩存文件的路徑（相對於當前頁面的路徑） //定義緩存有效期 $cachetime = 10; //判斷緩存文件是否存在 var_dump(filemtime($filename)); //filemtime($filename)不變,time()一直變，filemtime($filename)+10肯定會有小於time()的時候。 if(!file_exists($filename)||filemtime($filename)+$cachetime<time()){//filemtime($filename)獲取文件修改時間，加上定義的緩存時間小於當前時間 //開啟內存緩存 //filemtime()該文件上次修改內容 //filemtime($filename)第一次出現等於當前時間time();每過10秒走一次函數，filemtime($filename)的值就會改變 var_dump(time()); ob_start(); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>無標題文檔</title> </head> <body> <table width="100%" border="1" cellpadding="0" cellspacing="0" > <tr> <td>學號</td> <td>姓名</td> <td>性別</td> <td>生日</td> <td>班級</td> </tr> <?php//造連接對象 $db = new MySQLi("localhost","root","","ceshi"); //寫SQL語句 $sql = "select * from student"; //執行 $result = $db->query($sql); while($attr = $result->fetch_row()){ echo "<tr> <td>{$attr[0]}</td> <td>{$attr[1]}</td> <td>{$attr[2]}</td> <td>{$attr[3]}</td> <td>{$attr[4]}</td> </tr>"; } ?> </table> </body> </html> <?php //從內存緩存中獲取頁面代碼 $content = ob_get_contents(); //將獲取到的內容存放到緩存文件 file_put_contents($filename,$content); //清掉內存緩存 ob_flush(); echo "#####"; //測試是否調用了緩存文件，緩存文件不輸出這句話 } else{ //var_dump(filemtime($filename)); var_dump(time()); include($filename); //如果存在，調用緩存文件 } ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
</head>
<body>
<table width="100%" border="1" cellpadding="0" cellspacing="0" >
<tr>
<td>學號</td>
<td>姓名</td>
<td>性別</td>
<td>生日</td>
<td>班級</td>
</tr>
<tr>
<td>1</td>
<td>101</td>
<td>王超</td>
<td>男</td>
<td>2000-02-12 00:00:00</td>
</tr><tr>
<td>2</td>
<td>103</td>
<td>陸君</td>
<td>男</td>
<td>1974-06-03 00:00:00</td>
</tr><tr>
<td>3</td>
<td>105</td>
<td>匡明</td>
<td>男</td>
<td>1975-10-02 00:00:00</td>
</tr><tr>
<td>4</td>
<td>107</td>
<td>王麗</td>
<td>女</td>
<td>1976-01-23 00:00:00</td>
</tr><tr>
<td>5</td>
<td>108</td>
<td>曾華</td>
<td>男</td>
<td>1977-09-01 00:00:00</td>
</tr><tr>
<td>6</td>
<td>109</td>
<td>王芳</td>
<td>女</td>
<td>1975-02-10 00:00:00</td>
</tr><tr>
<td>7</td>
<td>110</td>
<td>劉備</td>
<td>男</td>
<td>0000-00-00 00:00:00</td>
</tr><tr>
<td>8</td>
<td>111</td>
<td>孫權1</td>
<td>男</td>
<td>0000-00-00 00:00:00</td>
</tr><tr>
<td>9</td>
<td>112</td>
<td>曹操</td>
<td>男</td>
<td>0000-00-00 00:00:00</td>
</tr><tr>
<td>10</td>
<td>113</td>
<td>劉邦</td>
<td>男</td>
<td>0000-00-00 00:00:00</td>
</tr><tr>
<td>11</td>
<td>114</td>
<td>周瑜</td>
<td>男</td>
<td>0000-00-00 00:00:00</td>
</tr><tr>
<td>17</td>
<td>098</td>
<td>zhangsan32</td>
<td>男</td>
<td>0000-00-00 00:00:00</td>
</tr> </table>
</body>
</html>
7.20php文件緩存