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What would be the best to use for..

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Hey all , i am doing a little project at the moment and i am just wondering what would be the best way to go about doing the following.

I query sql for certain info , the info that returns is say  a block of text, what i am looking at wanting to do is to stop display when it sees a certain tag, ie a block of text and within that text is <!stop> , when it see's that it won't display anything beyond that tag.

If somebody could point me in the right direction i would be most grateful.

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If you want to do this after the query then something like:
$mystring = 'This is a long block of usles text <!stop> that goes on forever.';

$findme  = '<!stop>';
$pos = strpos($mystring, $findme);

$ShortStr = substr($mystring, 0, $pos);

echo $ShortStr;


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