PHP 一些知识
1.取得当前内存使用大小：memory_get_usage()2.计算执行时间：microtime(true)
3.设置script执行时间限制set_time_limit
4.设置内存限制ini_set("memory_limit","256M");
3.从远程下载文件的两个方法：
$contents=file_get_contents("http://www.govtrack.us/data/us/gis/zip4dist-prefix.txt.gz");$file = fopen($file_name, "wb");fwrite($file, $contents);fclose($file);$handle = fopen("http://www.govtrack.us/data/us/gis/zip4dist-prefix.txt.gz", "rb");$file = fopen($file_name, "wb");$contents = '';while (!feof($handle)) {$contents = fread($handle, 8192);fwrite($file, $contents);}fclose($file);fclose($handle);
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