在PHP中删除文本文件的未知内容

Question

Is there a way to remove contents (substring) of a text file in PHP.

I know the start and the end of the string to remove, but not everything in between the content

File (routes.php) I want to edit

I want to keep this text here
# [[[@-100] I also want to remove the comment line here
  I want to remove this text here
# I also want to remove this line  [@-100]]]
I want to keep this line too

So I want to remove the content block that starts with # [[[@-100] and ends with [@-100]]]

Im using codeignighter so I write my file like so

$ROUTE_FILE ='system/routes.php'

$output = file_get_contents($ROUTE_FILE);

$output = $output->remove_substring(...);

$this->write_file($ROUTE_FILE, $output);

Answer 1

Tested:

$mystring='this is # [[[@-100] not [@-100]]] this string you want';

echo remove_substring('# [[[@-100]','[@-100]]]',$mystring);

function remove_substring($head,$foot,$string){
    $top=reset(explode($head,$string));
    $bottom=end(explode($foot,$string));
    return $top.$bottom;
}

output:

this is this string you want

Here's a version that does not return errors:

Tested:

$mystring='this is # [[[@-100] not [@-100]]] this string you want';

echo remove_substring('# [[[@-100]','[@-100]]]',$mystring);

function remove_substring($head,$foot,$string){
    $top=explode($head,$string);
    $top=reset($top);
    $bottom=explode($foot,$string);
    $bottom=end($bottom);
    return $top.$bottom;
}