我正在開發一個允許用戶將字串附加到 XML 檔案的專案。我的附加部分運行良好，但我還需要一種方法來防止用戶將重復的整體添加到strings每個tag部分的每個組中。相同的字串可以出現在 XML 檔案的其他部分。下面是我的代碼，用于附加檔案和即時編輯的 xml 檔案。我試圖在 if 陳述句中撰寫一些代碼來處理附加到 XML 的問題，試圖比較發布的值是否在字串陣列中，但我認為我可能有點不喜歡它。我會在它的位置發表評論。任何幫助都會有所幫助。這段代碼是我在這里發布的一個專案的一部分，但絕不是重復的問題。
<?php
error_reporting( E_ALL );
/*
We should ONLY proceed if these POST fields
are actually set.
*/
if( $_SERVER['REQUEST_METHOD']=='POST' && isset(
$_POST['location'],
$_POST['fileName'],
$_POST['symbol']
)){
/*
Prepare filters
*/
$args=array(
'symbol' => array('filter' => FILTER_SANITIZE_ENCODED, 'flags' => FILTER_REQUIRE_ARRAY ),
'location' => array('filter' => FILTER_SANITIZE_ENCODED, 'flags' => FILTER_REQUIRE_ARRAY ),
'fileName' => FILTER_SANITIZE_ENCODED
);
/*
modify the POST array based upon the filters and
extract the values directly into variables.
*/
$_POST=filter_input_array( INPUT_POST, $args );
extract( $_POST );
/*
set options for dealing with XML.
*/
libxml_use_internal_errors( true ) ;
$dom=new DOMDocument('1.0','UTF-8');
$dom->recover=true;
$dom->formatOutput=true;
$dom->preserveWhiteSpace=false;
$dom->validateOnParse=false;
$dom->strictErrorChecking=false;
$dom->load( urldecode( $fileName ) );
$xp=new DOMXPath( $dom );
/*
Iterate through all POSTed items
*/
foreach( $symbol as $index => $code ){
/* Locate the relevant section within the XML based upon the tag */
$loc=urldecode( $location[ $index ] );
$expr=sprintf( '//HighwayRoutingData/tag[ contains( text(), "%s") ]', urldecode( $loc ) );
$col=$xp->query( $expr );
/* create the new symbol and add to the relevant `destinationSymbols` node */
/* Here is the code I referenced above.
if( $col && $col->length > 0 && !empty( $code ) && !in_array($code, $symbol)){
$symbol=$dom->createElement( 'string', $code );
$dest=$xp->query( 'destinationSymbols', $col->item(0)->parentNode )->item(0);
$dest->appendChild( $symbol );
}
}
/* save the XML and redirect? */
$dom->save( urldecode( $fileName ) );
}
?>
<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='utf-8' />
<title>Simple XML Processing...</title>
</head>
<body>
<!--
a single form should be OK and there is no need to repeat the
`fileName` element as this is the same for each row in the table.
-->
<form method='post'>
<table border=1 cellpadding='5px' cellspacing='2px'>
<tr>
<th>Tag</th>
<th>Strings</th>
<th colspan=3> </th>
</tr>
<?php
$file='RouteSymbol.xml';
libxml_use_internal_errors( true ) ;
/*
Load the XML file and build the HTML output
*/
$dom=new DOMDocument();
$dom->validateOnParse=false;
$dom->recover=true;
$dom->strictErrorChecking=false;
$dom->load( $file );
libxml_clear_errors();
$xp=new DOMXPath( $dom );
$col=$xp->query('//HighwayRoutingData');
if( $col && $col->length > 0 ){
foreach( $col as $node ){
/*
find the `string` values and add to an array
which we will use to build a string later.
*/
$output=array();
$strings=$xp->query( 'destinationSymbols/string', $node );
foreach( $strings as $string )$output[]=$string->nodeValue;
/*
Find the tag for this node.
*/
$tag=$xp->query('tag',$node)->item(0)->nodeValue;
/*
Generate a new HTML table row with data found in this
node of the xml.
*/
printf('
<tr>
<td>%1$s</td>
<td>%2$s</td>
<td>
<input type="text" name="symbol[]" />
<input type="hidden" name="location[]" value="%1$s" />
</td>
<td><input type="submit" value="ADD" /></td>
<td><a href="#delete">Delete</a></td>
</tr>',
$tag,
implode( ', ', $output )
);
}
}
?>
</table>
<input type='hidden' name='fileName' value='<?=$filename;?>' />
</form>
</body>
</html>
<?xml version="1.0"?>
<ArrayOfHighwayRoutingData xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<HighwayRoutingData>
<tag>@I80</tag>
<destinationSymbols>
<string>SFO</string>
<string>OAK</string>
<string>EMR</string>
<string>ELC</string>
<string>RIC</string>
<string>SPB</string>
<string>HER</string><string>HER</string></destinationSymbols>
</HighwayRoutingData>
<HighwayRoutingData>
<tag>@SR24</tag>
<destinationSymbols>
<string>OAK</string>
<string>ORI</string>
<string>LFY</string>
<string>WCR</string>
</destinationSymbols>
</HighwayRoutingData>
<HighwayRoutingData>
<tag>@US101</tag>
<destinationSymbols>
<string>SFO</string>
<string>SSC</string>
<string>MIL</string>
<string>PAO</string>
</destinationSymbols>
</HighwayRoutingData>
</ArrayOfHighwayRoutingData>
uj5u.com熱心網友回復：
為了防止STRING每個HighwayRoutingData/destinationSymbols節點內的標簽重復，您需要根據以下修改后的摘錄查詢該節點以獲取包含給定文本的字串：
foreach( $symbol as $index => $code ){
$loc=urldecode( $location[ $index ] );
$expr=sprintf( '//HighwayRoutingData/tag[ contains( text(), "%s") ]', urldecode( $loc ) );
$col=$xp->query( $expr );
if( $col && $col->length > 0 && !empty( $code ) ){
/* find the parent node based upon the Tag & the target node */
$parent=$col->item(0)->parentNode;
$dest=$xp->query('destinationSymbols', $parent )->item(0);
/* Query within the target node to find strings matching POSTed value */
$expr=sprintf('string[ contains( text(), "%s" ) ]',$code );
$exists = $xp->query( $expr, $dest );
/* Not found, add new string */
if( $exists && $exists->length > 0 ){
# it exists....
}else{
# it does not exist....
$symbol=$dom->createElement( 'string', $code );
$dest->appendChild( $symbol );
}
}
}
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