Php string processing

Question

I need to find <p> tag inside a string. Then I want to store the string from (including)

tag into another variable.

For example I have string name firstString;

firstString = "<div id='tab-1'><p>This is first string</p></div>"

I want second string to be

secondString = "<p>This is first string</p>"

I need only first <p> tag.

Have a look at stackoverflow.com/questions/3577641/…

Clive
– Clive

2012-09-09 13:26:29 +00:00
Commented Sep 9, 2012 at 13:26 — Clive
– Clive, Commented Sep 9, 2012 at 13:26

Tchoupi · Accepted Answer · 2012-09-09 13:29:26Z

6

DOMDocument::loadHTML. Maybe not the fastest option, but should be simple.

$dom = new DOMDocument();
$dom->loadHTML($str);

$xp = new DOMXPath($dom);

$res = $xp->query('//p');

$firstParagraph = $res[0]->nodeValue;

edited Sep 9, 2012 at 13:29

Tchoupi

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answered Sep 9, 2012 at 13:28

Shail

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3 Comments

Kaleem Sajid Over a year ago

Fatal Error : Cannot use object of type DOMNodeList as array.

Shail Over a year ago

may be you can't access the DOMNodeList items with array-style syntax... you should instead use ->item(0).

Kaleem Sajid Over a year ago

Yeah.. It work.. Thank you Mathieu Imbert and Shail :) I used foreach loop. Also works with Shail's way.

moopet · Accepted Answer · 2012-09-09 13:28:30Z

0

You can use a simple regex to grab this substring.

$firstString = "<div id='tab-1'><p>This is first string</p></div>";
preg_match("#(<p>.+</p>)#", $firstString, $out);
echo $out[1];

There are other ways to do it if you know more precisely how the string is formed, or if you wish to pull out multiple substrings you can use preg_match_all instead.

If this is for scraping something from HTML in general though, you should be using a dedicated system like DOMDocument.

answered Sep 9, 2012 at 13:28

moopet

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Comments

Evert S · Accepted Answer · 2012-09-09 13:43:16Z

0

/* find opening tag */
$strPosBegin = strstr($firstString,"<p>");

if $strPosBegin != 0 {

    /* find position of closing tag */
    $strPosEnd = strstr($firstString,"</p>");

    /* adjust for the length of closing tag */
    $strPosEnd = $strPosEnd + 3;

    /* calculate difference, but need to add 1 */
    $strLength = $strPosEnd - $strPosBegin + 1;

     /* use substr to lift your search string out of $firstString
    $secondString = substr($firstString, $strPosBegin, $strLength);
}

answered Sep 9, 2012 at 13:43

Evert S

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