Quick tips on how PHP crawls Web content

How can php crawl the Web content correctly? This problem is a bit difficult for a friend who is in contact with the PHP language soon. The class has introduced a concrete solution for you today. First of all, in the c\windows in the php.ini I opened the Extension=php_curl.dll function, and then also restarted the Apapche, the following is the PHP crawl I wrote the content of the crawl Baidu PHP information: < PHP Initialize Curl $ch = Curl_init () or Die (Curl_error ()); echo "Test"; Set URL parameters curl_setopt ($ch, Curlopt_url, "http://http://www.baidu.com/s?wd=php"); Require Curl to return data curl_setopt ($ch, curlopt_returntransfer,1); Execute request $result = curl_exec ($ch) or Die (Curl_error ()); Gets the returned result and displays echo $result; echo Curl_error ($ch); Turn off Curl Curl_close ($ch); ?> Why does PHP not respond when crawling Web content? Even the text of the test is not, if I put echo "test", put in the first line can be output, I guess the curl_init () function is not running! You see PHP phpinfo () with no curl extension support! Cuff Php_curl.dll to C:\windows\ and C:\Windows\System32 and try again after you restart Apache. Not php_curl.dll This file, is the PHP directory in the libeay32.dll,ssleay32.dll copy to C:\Windows\System32 inside restart Apache For the sake of server security, so turn off the allow_url_fopen. When the server Allow_url_fopen = Off, the file_get_contents cannot be used, only when set on. < PHP/* $getstr =file_get_contents ("http://www. 163.com/weatherxml/54511.xml "); $QX =explode ("\" ", Strstr ($getstr," qx= ")); $WD =explode ("\" ", Strstr ($getstr," wd= ")); $qximg =explode ("\" ", Strstr ($getstr," qximg= ")); $qximg _=explode (",", $qximg [1]); echo "Beijing". $qx [1]. ""; echo $WD [1];*/ echo "< img src= ' http://news. 163.com/img/logo/". $qximg _[0]." ' > < img src= ' http://news.163.com/img/logo/". $qximg _[1]." ' > "; ?> The following example of PHP crawling Web content is the pass Curl_init function to get 163 weather forecast Remove the php.ini (; extension=php_curl.dll) in front of the (;)) Save Copy Php_curl.dll,libeay32.dll,ssleay32.dll to C:\Windows\System32, restart IIS, no Apache < PHP Initialize Curl $ch = Curl_init () or Die (Curl_error ()); Set URL parameters curl_setopt ($ch, Curlopt_url, "http://http://www.163.com/weatherxml/54511.xml"); Require Curl to return data curl_setopt ($ch, curlopt_returntransfer,1); Execute request $result = curl_exec ($ch) or Die (Curl_error ()); Gets the returned result and displays echo $result; echo Curl_error ($ch); $QX =explode ("\" ", Strstr ($result," qx= ")); $WD =explode ("\" ", Strstr ($result," wd= ")); $qximg =explode ("\" ", Strstr ($result," qximg= ")); $qximg _=explode (",", $qximg [1]); echo "Beijing". $qx [1]. " < br/> "; echo $WD [1]; Turn off Curl Curl_close ($ch); ?> Through the above on the PHP crawl Web content learning, you can actually work on their own to deepen the understanding of it. More information: http://www.kokojia.com/s64/

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