SimpleXMLIterator::rewind()函数是PHP中的内置函数,用于将SimpleXMLIterator倒退到第一个元素。
用法:
void SimpleXMLIterator::rewind( void )
参数:该函数不接受任何参数。
返回值:该函数不返回任何值。
以下示例程序旨在说明PHP中的SimpleXMLIterator::rewind()函数:
示例1:
<?php
// Store the xml element to variable
$xml = <<<XML
<organization>
<name>GeeksforGeeks</name>
<address>Noida India</address>
<contact>
<email>abc@geeksforgeeks.org</email>
<mobile>+91-987654321</mobile>
</contact>
</organization>
XML;
$xmlIt = new SimpleXMLIterator($xml);
// Use rewind() function to rewind
// to the first element
$xmlIt->rewind();
// Use next() functin to move to the
// next element
$xmlIt->next();
$xmlIt->next();
// Display result
var_dump($xmlIt->current());
?>
输出:
object(SimpleXMLIterator)#2 (2) { ["email"]=> string(21) "abc@geeksforgeeks.org" ["mobile"]=> string(13) "+91-987654321" }
示例2:
<?php
// Store the xml element to variable
$xml = <<<XML
<organization>
<name>GeeksforGeeks</name>
<address>Noida India</address>
<contact>
<email>abc@geeksforgeeks.org</email>
<mobile>+91-987654321</mobile>
</contact>
</organization>
XML;
$xmlIt = new SimpleXMLIterator($xml);
// Loop starts from first element of xml and
// run upto when elements are not valid
for( $xmlIt->rewind(); $xmlIt->valid(); $xmlIt->next() ) {
var_dump($xmlIt->key());
}
?>
输出:
string(4) "name" string(7) "address" string(7) "contact"
参考: https://www.php.net/manual/en/simplexmliterator.rewind.php
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