删除最后一行并检查文本文件中的数据 [英] Delete last line and check data in text file
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问题描述
我有以下代码将数据写入文本文件.
I have the following code to write data to a text file.
$somecontent = "data|data1|data2|data3";
$filename = 'test.txt';
// Let's make sure the file exists and is writable first.
IF (IS_WRITABLE($filename)) {
// In our example we're opening $filename in append mode.
// The file pointer is at the bottom of the file hence
// that's where $somecontent will go when we fwrite() it.
IF (!$handle = FOPEN($filename, 'a')) {
PRINT "Cannot open file ($filename)";
EXIT;
}
// Write $somecontent to our opened file.
IF (!FWRITE($handle, $somecontent)) {
PRINT "Cannot write to file ($filename)";
EXIT;
}
PRINT "Success, wrote ($somecontent) to file ($filename)";
FCLOSE($handle);
} ELSE {
PRINT "The file $filename is not writable";
}
现在,我希望此文本文件每个仅包含10行数据,并且当添加新行的数据(对于其他行是唯一的)时,删除最后一行数据,并添加新行数据.
Now I want this text file to only every have 10 lines of data and when a new line of data is added which is unique to the other lines then the last line of data is deleted and a new line of data is added.
从研究中我发现以下代码,但是完全不知道如何在上述代码上实现它.
From research I have found the following code however total no idea how to implement it on the above code.
以及实现以下代码的最简单方法是什么?
and also what is the easiest way to implement the following code?
<?
$inp = file('yourfile.name');
$out = fopen('yourfile.name','w');
for ($I=0;$i<count($inp)-1);$i++)
fwrite($out,$inp[$I]);
fclose($out)l
?>
感谢PHP新手的任何帮助.
Thanks for any help from a PHP newbie.
推荐答案
$file = fopen($filename, "r");
$names = array();
// Put the name part of each line in an array
while (!feof($file)) {
$line_data = explode("|", $fgets($file));
$names[] = $line_data[0]
}
$data_to_add = "name|image|price|link"
$data_name = "name" // I'm assuming you have this in a variable somewhere
// If the new data does not exist in the array
if(!in_array($data_name, $names)) {
unset($lines[9]); // delete the 10th line
array_unshift($lines, $data_to_add); // Put new data at the front of the array
// Write the new array to the file
file_put_contents($filename, implode("\n", $lines));
}
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