这是我的代码:
$string2 = file_get_contents('maps/' . $region . '.txt');
$string2 = explode("'n", $string2);
foreach($string2 as $value2) {
$string2 = unserialize($value2);
if($string2['x_pos'] == ($x2 + 4) && $string2['y_pos'] == ($y2 + 8)) {
$length2 = strlen($string2['amount']);
$new_amount = ($string2['amount'] + 0) - ($resource_quantity + 0);
$changed = substr_replace($value2, $new_amount, 123, $length2);
file_put_contents('maps/' . $region . '.txt', $changed);
break 1;
}
}
我想让代码做的是打开文件，读取每一行，直到找到它想要的行，然后用编辑的行重新保存文件。问题是，它可以工作，但它只将其与编辑行保存在一起，并删除所有其他行。
我想保持我使用的方法(file_get_contents &File_put_contents)，除非有一种非常简单的方法。有人能帮帮我吗?
您需要将写操作移到循环之后，并让它写入从文件中读取的所有内容。当前的方式是，它将所有内容替换为$changed(只有一行)。
以上，除了稍微改进了代码之外，还导致了:
$filename = 'maps/' . $region . '.txt';
$lines = file($filename);
foreach($lines as &$line) { // attention: $line is a reference
$obj = unserialize($line);
if(/* $obj satisfies your criteria*/) {
$line = /* modify as you need */;
break;
}
}
file_put_contents($filename, implode("'n", $lines));
试着这样做:http://php.net/file(将整个文件读取到数组中)
按行拆分文件的最佳方法是使用file()。下面是我要做的(FIXED):
<?php
// This exactly the same effect as your first two lines
$fileData = file("maps/$region.txt");
foreach ($fileData as $id => $line) {
// This is probably where your problem was - you were overwriting
// $string2 with your value, and since you break when you find the
// line, it will always be the line you were looking for...
$line = unserialize($line);
if ($line['x_pos'] == ($x2 + 4) && $line['y_pos'] == ($y2 + 8)) {
$amountLen = strlen($line['amount']);
// Sorry, adding zero? What does this achieve?
$new_amount = $line['amount'] - $resource_quantity;
// Modify the actual line in the original array - by catching it in
// $changed and writing that variable to file, you are only writing
// that one line to file.
// I suspect substr_replace is the wrong approach to this operation
// since you seem to be running it on PHP serialized data, and a
// more sensible thing to do would be to modify the values in $line
// and do:
// $fileData[$id] = serialize($line);
// ...however, since I can;t work out what you are actually trying
// to achieve, I have fixed this line and left it in.
$fileData[$id] = substr_replace($fileData[$id], $new_amount, 123, $amountLen);
break;
}
}
file_put_contents("maps/$region.txt", $fileData);
?>