DOMElement::removeAttributeNode()

(PHP 5, PHP 7)

Removes attribute

说明

publicDOMElement::removeAttributeNode(DOMAttr$oldnode): bool

Removes attribute$oldnodefrom the element.

参数

$oldnode

The attribute node.

返回值

成功时返回TRUE，或者在失败时返回FALSE。

错误／异常

DOM_NO_MODIFICATION_ALLOWED_ERR

Raised if the node is readonly.

DOM_NOT_FOUND_ERROR

Raised if$oldnodeis not an attribute of the element.

参见

• DOMElement::hasAttribute() Checks to see if attribute exists
• DOMElement::getAttributeNode() Returns attribute node
• DOMElement::setAttributeNode() Adds new attribute node to element

Basic: I use PHP5.4.9 from Ubuntu 13.04 repository. The aim of my code is to iterate HTML source (as a DomDocument) recursively and cleanup everything that is not valid to be used inside Epub files (i.e. and attribute align is not valid for paragraphs in Epubs).
FIRST: Today I tried removing attributes from a DOMElement using this simple code:
<?php
for ( $k=0; $k < $element->attributes->length; $k++) {
  if( /* some rule */ ){
    var_dump( $element->attributes->item($k)->nodeName);
    $element->removeAttributeNode( $element->attributes->item($k));
  }
}
?>
Unfortunately all attributes still existed when this loop was finished, even if these var_dumps told me that deleting them was tried.
I solved this problem iterating the attributes list backward:
<?php
for ( $k = $element->attributes->length - 1; $k >= 0; --$k) {
  if( /* same rule */ ){
    var_dump( $element->attributes->item($k)->nodeName);
    $element->removeAttributeNode( $element->attributes->item($k));
  }
}
?>
SECOND: DOMElement::removeAttributeNode does NOT return a bool but a DOMAttr object.