PHP打开一个php文件并替换内容

I wanna to open a php file and replace the content I tried this code but it didn't work,

$fh = fopen("c/".$file."/underbaba.php", 'w');
$file = file_get_contents($fh);
$file = str_replace('error":4,', 'error":0,', $file);

This system open my file and delete all the code in file underbaba.php, I need a code because I have a lot of files to edit I used scandir and foreach for reading files in all directory c with name underbaba.php, Thanks.

You need to open your file in append mode use mode a+ or r+ for this

Please check the below link for help https://www.w3schools.com/php/php_file_open.asp

If that is all you are doing, then yes you are emptying your file. According to the manual:

'w' Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.

Are you writing the string you have modified back to the file somewhere as well?

Your problem:

If you use file_get_contents you don't pass a file handle but the path to the file as a string.

While

$fh = fopen("c/".$file."/underbaba.php", 'w');

without writing to the file with fwrite will result in simply erasing the file. Also the file should be fclosed before the script ends.

The solution:

Simply Use file_get_contents to read the file then file_put_contents to write.

$contents = file_get_contents( $full_path_to_file );
$contents = str_replace( 'error":4,', 'error":0,', $contents );
file_put_contents( $full_path_to_file, $contents );

You get a very little overhead versus using a sequence of fopen, fread, fseek, fwrite, fclose because the file is opened and closed twice but I don't think this is an issue.

Worth mentioning that file_get_contents will read all the whole file at once and store it into memory so this solution is feasable only with files with a reasonable size.

You may add error handling easily:

$contents = file_get_contents( $full_path_to_file );
if( $contents === false )
{
    // an error occurred reading
}

$contents = str_replace( 'error":4,', 'error":0,', $contents );

$bytes_written = file_put_contents( $full_path_to_file, $contents );
if( $bytes_written !== strlen( $contents ) )
{
    // an error occurred writing
}

As you're operating on a set of files setup a for / foreach loop setting $full_path_to_file properly at each iteration.

For your reference:

file_get_contents

file_put_contents