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的長度,我有這樣的代碼:獲取一個DOM對象PHP
$strhtml = $segatieladvance;
$dochtml = new DOMDocument();
$dochtml->loadHTML($strhtml);
$elm = $dochtml->getElementById('upPanelActuciones');
$segatiel= $dochtml->saveXml($elm);
我想知道在$ segatiel caracthers的數量,我該怎麼辦?