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的长度,我有这样的代码:获取一个DOM对象PHP
$strhtml = $segatieladvance;
$dochtml = new DOMDocument();
$dochtml->loadHTML($strhtml);
$elm = $dochtml->getElementById('upPanelActuciones');
$segatiel= $dochtml->saveXml($elm);
我想知道在$ segatiel caracthers的数量,我该怎么办?