在下面的字符串中,我想用某些文本<!--more-->
替换FOOBAR
,然后截断该字符串。
<p>The quick <a href="/">brown</a> fox jumps <!--more-->
over the <a href="/">lazy</a> dog.</p>
我已经到了这一点:
<p>The quick <a href="/">brown</a> fox jumps FOOBAR
...但是如您所见,<p>
标记未关闭。关于如何始终如一地平衡标签的任何想法?我对PHP很陌生。
我正在使用的数组如下所示:
array(2) {
[0]=>
string(50) "<p>The quick <a href="/">brown</a> fox jumps "
[1]=>
string(45) " over the <a href="/">lazy</a> dog.</p>"
}
参考方案
我尚未对此进行全面测试,但至少可以在您的示例中使用。假定格式正确的XML。
<?php
$reader = new XMLReader;
$writer = new XMLWriter;
// load the XML string into the XMLReader
$reader->xml('<p>The quick <a href="/">brown</a> fox jumps <!--more--> over the <a href="/">lazy</a> dog.</p>');
// write the new XML to memory
$writer->openMemory();
$done = false;
// XMLReader::read() moves the current read location to the next node
while ( !$done && $reader->read()) {
// choose action based on the node type
switch ($reader->nodeType) {
case XMLReader::ELEMENT:
// read an element, so write it back to the output
$writer->startElement($reader->name);
if ($reader->hasAttributes) {
// loop through all attributes and write them
while($reader->moveToNextAttribute()) {
$writer->writeAttribute($reader->name, $reader->value);
}
// move back to the beginning of the element
$reader->moveToElement();
}
// if the tag is empty, close it now
if ($reader->isEmptyElement) {
$writer->endElement();
}
break;
case XMLReader::END_ELEMENT:
$writer->endElement();
break;
case XMLReader::TEXT:
$writer->text($reader->value);
break;
case XMLReader::COMMENT:
// you can change this to be more flexible if you need
// e.g. preg_match, trim, etc.
if (trim($reader->value) == 'more') {
// write whatever you want in here. If you have xml text
// you want to write verbatim, use writeRaw() instead of text()
$writer->text('FOOBAR');
// this is where the magic happens -- endDocument closes
// any remaining open tags
$writer->endDocument();
// stop the loop (could use "break 2", but that gets confusing
$done = true;
}
break;
}
}
echo $writer->outputMemory();
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