本篇文章给大家带来的内容是关于php中常用的采集函数的总结（附代码），有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。
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($code){
preg_match_all(‘/<as+href=[“|’]?([^>”‘ ]+)[“|’]?s*[^>]*>([^>]+)</a>/i’,$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);
$txt = preg_replace(“/[rn]{1,}/isu”,”<br/>rn”,$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) {
$table = preg_replace(“‘<td[^>]*?>’si”,’”‘,$table);
$table = str_replace(“</td>”,’”,’,$table);
$table = str_replace(“</tr>”,”{tr}”,$table);
//去掉 html 标记
$table = preg_replace(“‘<[/!]*?[^<>]*?>’si”,””,$table);
//去掉空白字符
$table = preg_replace(“‘([rn])[s]+’”,””,$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) {
$table = preg_replace(“‘<table[^>]*?>’si”,””,$table);
$table = preg_replace(“‘<tr[^>]*?>’si”,””,$table);
$table = preg_replace(“‘<td[^>]*?>’si”,””,$table);
$table = str_replace(“</tr>”,”{tr}”,$table);
$table = str_replace(“</td>”,”{td}”,$table);
//去掉 html 标记
$table = preg_replace(“‘<[/!]*?[^<>]*?>’si”,””,$table);
//去掉空白字符
$table = preg_replace(“‘([rn])[s]+’”,””,$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];
}
