无法在 PHP 中将斜杠写入文件

Question

I am trying to write simple string into file which should contain backslash, when I print on the screen backslash is there but when write into file using fwrite it is removed. I have try double, quadruple escape it still doesn't work

$key="Hello";
$trs ="This place is 'too cool'";
$removed = str_replace("'", '\\\\\'', $trs);
if($removed!=$trs){
     echo $removed."<br>";
}
fwrite($file, "'$key' => '".$removed."'" . ",\n");

When run the code I will get - This place is \\\\'too cool\\\\' But when the same value is written to the file I will get This place is 'too cool'

Answer 1

如果需要反斜杠 \\ 作为字符并且不应是转义序列，则可以在双引号中使用 \\x5C。

$removed = str_replace("'", "\x5C\x5C'", $trs);