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$str = '<span class="cnt">(105)</span>';
preg_match ( '/<span class="cnt">.*\(([\d]+)\)/', $str, $foo );
$bar=isset ($foo[1])? $foo[1]:'';
echo $bar;
$str='<span class="cnt">(105)</span>';
preg_match('/<span class="cnt">.*\(([\d]+)\)/', $str,$foo);
echo $foo[1];