php中常用的采集函数的总结，值得收藏！（php数据抓取）

这几天关注了一下PHP的采集程序，才发现用PHP采集内容是这么方便，把经常用到的采集函数在这里总结一下，方便以后使用!

获取所有链接内容和地址

function getAllURL($code){

preg_match_all('/"']+)["|']?s*[^>]*>([^>]+)/i',$code,$arr);

return array('name'=>$arr[2],'url'=>$arr[1]);

}

获取所有的图片地址

function getImgSrc($code){

$reg="/]*src="(http://(.+)/(.+).(jpg|gif|bmp|bnp|png))"/isU";

preg_match_all($reg,$code,$img_array,PREG_PATTERN_ORDER);

return $img_array[1];

}

当前的脚本网址

function getSelfURL(){

if(!empty($_SERVER["REQUEST_URI"])){

$scriptName = $_SERVER["REQUEST_URI"];

$nowurl = $scriptName;

}else{

$scriptName = $_SERVER["PHP_SELF"];

if(empty($_SERVER["QUERY_STRING"]))$nowurl=$scriptName;

else$nowurl=$scriptName."?".$_SERVER["QUERY_STRING"];

}

return $nowurl;

}

把全角数字转为半角数字

function getAlabNum($fnum){

$nums=array("０","１","２","３","４","５","６","７","８","９");

$fnums = "0123456789";

for($i=0;$i<=9;$i++)$fnum=str_replace($nums[$i],$fnums[$i],$fnum);

$fnum = ereg_replace("[^0-9.]|^0{1,}","",$fnum);

if($fnum=="") $fnum=0;

return $fnum;

}

去除HTML标记

function text2Html($txt){

$txt = str_replace(" ","　",$txt);

$txt = str_replace("<","<",$txt);

$txt = str_replace(">",">",$txt);

$txt = preg_replace("/[ ]{1,}/isU","
",$txt);

return $txt;

}

清除HTML标记

function clearHtml($str){

$str = str_replace('<','<',$str);

$str = str_replace('>','>',$str);

return $str;

}

相对路径转化成绝对路径

function relative2Absolute($content, $feed_url) {

preg_match('/(http|https|ftp):///',$feed_url, $protocol);

$server_url = preg_replace("/(http|https|ftp|news):///", "", $feed_url);

$server_url = preg_replace("//.*/", "", $server_url);

if ($server_url == '') {

return $content;

}

if (isset($protocol[0])) {

$new_content=preg_replace('/href="//', 'href="'.$protocol[0].$server_url.'/', $content);

$new_content=preg_replace('/src="//', 'src="'.$protocol[0].$server_url.'/', $new_content);

} else {

$new_content = $content;

}

return $new_content;

}

获取指定标记中的内容

function getTagData($str, $start, $end){

if ( $start == '' || $end == '' ){

return;

}

$str = explode($start, $str);

$str = explode($end, $str[1]);

return $str[0];

}

HTML表格的每行转为CSV格式数组

function getTrArray($table) {

$table = preg_replace("']*?>'si",'"',$table);

$table = str_replace("",'",',$table);

$table = str_replace("","{tr}",$table);

//去掉 HTML 标记

$table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);

//去掉空白字符

$table = preg_replace("'([ ])[s]+'","",$table);

$table = str_replace(" ","",$table);

$table = str_replace(" ","",$table);

$table = explode(",{tr}",$table);

array_pop($table);

return $table;

}

将HTML表格的每行每列转为数组，采集表格数据

function getTdArray($table) {

$table = preg_replace("']*?>'si","",$table);

$table = preg_replace("']*?>'si","",$table);

$table = preg_replace("']*?>'si","",$table);

$table = str_replace("","{tr}",$table);

$table = str_replace("","{td}",$table);

//去掉 HTML 标记

$table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);

//去掉空白字符

$table = preg_replace("'([ ])[s]+'","",$table);

$table = str_replace(" ","",$table);

$table = str_replace(" ","",$table);

$table = explode('{tr}', $table);

array_pop($table);

foreach ($table as $key=>$tr) {

$td = explode('{td}', $tr);

array_pop($td);

$td_array[] = $td;

}

return $td_array;

}

返回字符串中的所有单词 $distinct=true 去除重复

function splitEnStr($str,$distinct=true) {

preg_match_all('/([a-zA-Z]+)/',$str,$match);

if ($distinct == true) {

$match[1] = array_unique($match[1]);

}

sort($match[1]);

return $match[1];

}

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