SimpleXMLIterator::valid

(PHP 5 >= 5.1.0)

SimpleXMLIterator::valid — Check whether the current element is valid

说明

public bool SimpleXMLIterator::valid ( void )

This method checks if the current element is valid after calls to SimpleXMLIterator::rewind() or SimpleXMLIterator::next() .

参数

此函数没有参数。

返回值

Returns TRUE if the current element is valid, otherwise FALSE

范例

Example #1 Check whether the current element is valid

  <?php
$xmlIterator  = new  SimpleXMLIterator ( '<books><book>SQL Basics</book></books>' );

 $xmlIterator -> rewind ();  // rewind to the first element
 echo  var_dump ( $xmlIterator -> valid ());  // bool(true)

 $xmlIterator -> next ();  // advance to the next element
 echo  var_dump ( $xmlIterator -> valid ());  // bool(false) because there is only one element
 ?>