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PHP SimpleXML valid() 函数
demo_func_simplexml_valid2
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<!DOCTYPE html> <html> <body> <?php $xml = new SimpleXMLIterator('<books><book>Learn PHP</book></books>'); // rewind to the first element $xml->rewind(); // check if valid var_dump($xml->valid()); // move to the next element $xml->next(); // check if valid - will be bool(false) because there is only one element var_dump($xml->valid()); ?> </body> </html>