PHP version of getElementById

<?php/** * Created by Phpstorm. * user:c.yu * date:14-8-2 * Time: PM 11:11 */function getElementById ($content, $id, $return _type = ' substr ') {if (preg _match (' @< ([a-z]+) [^>]*id=[\ "\ ']? '. $id. ‘[\"\‘]?        [^>]*>@i ', $content, $res)) {$start = Strpos ($content, $res [0]);        $end = 0; $start _tag = ' < '. $res [1]; Start label $end _tag = ' </'. $res [1]. ' > ';        End tag $lastStart _pos = Strrpos ($content, $start _tag);                $lastEnd _pos = Strrpos ($content, $end _tag);        Stores all start and end label pos $STARTARR = Array ();           $ENDARR = Array ();        $next _pos = 0;            while ($next _pos < $lastStart _pos) {$p _start = Stripos ($content, $start _tag, $next _pos);            $STARTARR [] = $p _start;        $next _pos = $p _start + 1;        } $next _pos = 0;            while ($next _pos < $lastEnd _pos) {$p _end = Stripos ($content, $end _tag, $next _pos);            $ENDARR [] = $p _end; $next _pos = $p _end + 1; }//start tag number is not equal to the number of end tags, exit if (count ($STARTARR)! = Count ($ENDARR)) {exit (' error when calling getElementById:: &lt Font color= "Red" > Your label '. Htmlspecialchars ("{$start _tag} id= ' {$id} ' >").        ' There is no closure at the time of use, does not conform to XHTML, the system forcibly stops matching </font>. ');        }//does not match the start tag if (count ($STARTARR) <=0) {return '; }//If the start tag is full-text only one if (count ($STARTARR) ==1) {$secondary = substr ($content, $STARTARR [0], $ENDARR [0] + strlen            ($end _tag)-$startArr [0]);        return $secondary;        }//the index of the start tag of the specified ID in the set of all start tags $startIndex = 0;        $startCount = 1;                 for ($i = 0; $i < count ($STARTARR); $i + +) {if ($startArr [$i] = = = $start) {$startIndex = $i;            Break  }//if the subscript for the start label of the specified ID is the last if of the array ($startIndex = = = Count ($STARTARR)-1) {$secondary = substr ($content,      $STARTARR [$startIndex], $ENDARR [$startIndex] + strlen ($end _tag)-$startArr [$startIndex]);      return $secondary;   }//Specifies the ID start label for the next start label of the POS and the next start label between POS,//To be able to pair, take the end tag of the pos//<start1><end1><start2> The number of end between the Start1 and the next start2 is the number of 1,start, which is also 1, taking End1 pos//<start1><start2><end2><end1><        The number of end between Start3> Start1 and Start3 is the number of 2,start is also 2, take end1 pos $startNext = $startArr [$startIndex + $startCount];        $endCount = Getendcount ($start, $startNext, $ENDARR, $startCount, $end);            while ($endCount < $startCount) {$startCount + +;            $startNext = $STARTARR [$startIndex + $startCount];        $endCount = Getendcount ($start, $startNext, $ENDARR, $startCount, $end);        } $secondary = substr ($content, $start, $end + strlen ($end _tag)-$start);    return $secondary;    } else {return false;    }}function Getendcount ($start, $startNext, $ENDARR, $startCount,& $endPos) {$endCount = 0; for ($j = 0; $j < count ($ENDARR)-1; $j + +) {if ($ENDARR [$j] < $startNext && $ENDARR[$j] > $start) {$endCount + +;            if ($endCount = = = $startCount) {$endPos = $ENDARR [$j]; }}} return $endCount;}

　　

PHP version of getElementById