php中常用的擷取函數的總結（附程式碼）

這篇文章帶給大家的內容是關於php常用的採集函數的總結（附程式碼），有一定的參考價值，有需要的朋友可以參考一下，希望對你有幫助。

這幾天關注了一下PHP的採集程序，才發現用PHP採集內容是這麼方便，把經常用到的採集函數在這裡總結一下，方便以後使用!

取得所有連結內容和位址

function getAllURL($code){
preg_match_all(&#39;/<a\s+href=["|\&#39;]?([^>"\&#39; ]+)["|\&#39;]?\s*[^>]*>([^>]+)<\/a>/i&#39;,$code,$arr);
return array(&#39;name&#39;=>$arr[2],&#39;url&#39;=>$arr[1]);
}

取得所有的圖片位址

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];
}

目前的腳本網址

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;
}

把全角數字轉為半角數字

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;
}

移除HTML標記

function text2Html($txt){
$txt = str_replace(" ","　",$txt);
$txt = str_replace("<","<",$txt);
$txt = str_replace(">",">",$txt);
$txt = preg_replace("/[\r\n]{1,}/isU","<br/>\r\n",$txt);
return $txt;
}

清除HTML標記

function clearHtml($str){
$str = str_replace(&#39;<&#39;,&#39;<&#39;,$str);
$str = str_replace(&#39;>&#39;,&#39;>&#39;,$str);
return $str;
}

相對路徑轉換成絕對路徑

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;
}

取得指定標記中的內容

function getTagData($str, $start, $end){
if ( $start == '' || $end == '' ){
return;
}
$str = explode($start, $str);
$str = explode($end, $str[1]);
return $str[0];
}

#HTML表格的每行轉為CSV格式陣列

function getTrArray($table) {
$table = preg_replace("&#39;<td[^>]*?>&#39;si",&#39;"&#39;,$table);
$table = str_replace("</td>",&#39;",&#39;,$table);
$table = str_replace("</tr>","{tr}",$table);
//去掉 HTML 标记
$table = preg_replace("&#39;<[\/\!]*?[^<>]*?>&#39;si","",$table);
//去掉空白字符
$table = preg_replace("&#39;([\r\n])[\s]+&#39;","",$table);
$table = str_replace(" ","",$table);
$table = str_replace(" ","",$table);
$table = explode(",{tr}",$table);
array_pop($table);
return $table;
}

將HTML表格的每行每列轉為數組，採集表格資料

function getTdArray($table) {
$table = preg_replace("&#39;<table[^>]*?>&#39;si","",$table);
$table = preg_replace("&#39;<tr[^>]*?>&#39;si","",$table);
$table = preg_replace("&#39;<td[^>]*?>&#39;si","",$table);
$table = str_replace("</tr>","{tr}",$table);
$table = str_replace("</td>","{td}",$table);
//去掉 HTML 标记
$table = preg_replace("&#39;<[\/\!]*?[^<>]*?>&#39;si","",$table);
//去掉空白字符
$table = preg_replace("&#39;([\r\n])[\s]+&#39;","",$table);
$table = str_replace(" ","",$table);
$table = str_replace(" ","",$table);
$table = explode(&#39;{tr}&#39;, $table);
array_pop($table);
foreach ($table as $key=>$tr) {
$td = explode(&#39;{td}&#39;, $tr);
array_pop($td);
$td_array[] = $td;
}
return $td_array;
}

傳回字串中的所有單字$distinct=true 移除重複

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];
}

相關建議：

PHP採集程式中常用的函數

php 使用CURL函數採集

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