Question

求一个php的缓存程序

<?php
$s=file_get_contents("http://www.chaoliuxi.com/category.php?id=1");
preg_match_all('|<div class="bbpic">\s*<a><img src="([^"]*)"/></a>\s*</div>\s*<div class="bbinfo">\s*<a>([^<]*)</a>\s*</div>|', $s, $reg);
//提取图片网址和图片标题并输出
foreach ($reg[1] as $i=>$k1){
$k2=$reg[2][$i];
echo $k1;
echo $k2;
}

?>

采集的页面，现在匹配也没问题，请问如果把匹配提取的数组生成缓存文件呢，要求有个缓存开关和缓存时间，以及判断是否有缓存文件，如果有缓存文件就调用缓存文件，没有缓存文件就采集网站，谢谢了

Answer 1

<?php
define('PHPMPS_ROOT', dirname(__FILE__));

if (!function_exists('file_get_contents'))
{
function file_get_contents($file)
{
if (($fp = @fopen($file, 'rb')) === false)
{
return false;
}
else
{
$fsize = @filesize($file);
if ($fsize)
{
$contents = fread($fp, $fsize);
}
else
{
$contents = '';
}
fclose($fp);

return $contents;
}
}
}

if (!function_exists('file_put_contents'))
{
define('FILE_APPEND', 'FILE_APPEND');

function file_put_contents($file, $data, $flags = '')
{
$contents = (is_array($data)) ? implode('', $data) : $data;

if ($flags == 'FILE_APPEND')
{
$mode = 'ab+';
}
else
{
$mode = 'wb';
}

if (($fp = @fopen($file, $mode)) === false)
{
return false;
}
else
{
$bytes = fwrite($fp, $contents);
fclose($fp);

return $bytes;
}
}
}

function read_cache($filename)
{
$result = array();
if (!empty($result[$filename]))
{
return $result[$filename];
}
$filepath = PHPMPS_ROOT . '/data/' . $filename . '.php';
if (file_exists($filepath))
{
include_once($filepath);
$result[$filename] = $data;
return $result[$filename];
}
else
{
return false;
}
}

function write_cache($filename, $val)
{
$filepath = PHPMPS_ROOT . '/data/' . $filename . '.php';

$content = "<?php\r\n";
$content .= "\$data = " . var_export($val, true) . ";\r\n";
$content .= "?>";
echo $content;
file_put_contents($filepath, $content, LOCK_EX);
}

$content = array();
foreach ($cat_content[1] as $i=> $k1){
$content[]=array('0' => $k1,
'1'=> $cat_content[2][$i],
'2'=> $cat_content[3][$i]);
}
write_cache('t_123',$content);

echo 'suc';
?>