Question

我现在正在使用函数fwrite（）;用PHP。但是我希望在特定规则之后找到我的新事物。

这将是输出。

<?xml version="1.0" encoding="utf-8" ?> 
<logs>
    <log type="text">the new log</log>
    <log type="text>the old log</log>
    <log type="login">some other log.</log>
</logs>

如何在新日志中获取新日志，而不是在最后。我只能找到像file_get_contents和str_replace这样的东西。但这似乎真的没有效率。

我的PHP代码：

$file = $this->path.'logs.xml';
    // Open our file. And Create file if it doesn't exsist
    $fopen = fopen($file, "w+");

    // Looks if file is empty.
    if(filesize($file) == 0) {

        /*
         * Put your data in XML data.
         */
        $xmlData = "<?xml version=\"1.0\" encoding=\"utf-8\" ?> \r\n";
        $xmlData .= "<logs> \r\n";
            $xmlData .= "\t<log type=\"".$data[0]."\">\r\n";
                $xmlData .= "\t\t<author>".$data[1]."</author>\r\n";
                $xmlData .= "\t\t<action>".$data[2]."</action>\r\n";
                $xmlData .= "\t\t<result>".$data[3]."</result>\r\n";
                $xmlData .= "\t\t<note>".$data[4]."</note>\r\n";
            $xmlData .- "\t</log>\r\n";
        $xmlData .= "</logs>";

    } else {



    }

    if(is_writeable($file)) {

        fwrite($fopen, $xmlData);
        return true;

    }
    return false;
    fclose($fopen);

真诚地感谢你。

Answer 1

嗯，您很幸运，您的数据是XML格式的。 PHP有一堆易于使用的库（扩展）来处理XML数据。例如SimpleXML或功能更强DOM（默认情况下都启用这两个扩展名）。

<?php
    $filename = $this->path.'logs.xml';

    if (!file_exists($filename)) {
       // Here's your code from above, although it would be easier to use
       // the libraries here, as well
    } else {
       $logs = simplexml_load_file($filename);
       // See if there's a "text" log element
       $txtlog = $logs->xpath('./log[@type = "text"]');
       ...
    }

Answer 2

您可以使用array_splice方法。这样，您就可以在任何位置的数组中插入新元素。

$file = $this->path.'logs.xml';

$content = file($file); //is array with all lines as elements.

/*
0: <?xml version="1.0" encoding="utf-8" ?> 
1: <logs>
2:    <log type="text>the old log</log>
3:    <log type="login">some other log.</log>
4: </logs>
*/

//insert the new line at position 2
array_splice( $content, 2, 0, '    <log type="text">the new log</log>' );

/*
0: <?xml version="1.0" encoding="utf-8" ?> 
1: <logs>
2:    <log type="text">the new log</log>
3:    <log type="text>the old log</log>
4:    <log type="login">some other log.</log>
5: </logs>
*/

$fopen = fopen($file, "w+");
fwrite($fopen, implode("\n", $content);
fclose($fopen);

的fwrite（）;在特定行之前和之后

2 个答案: