Delete file specific file content between a characters using php [duplicate] - php

Question

This question already has answers here:
RegEx to remove /** */ and // ** **// php comments
(3 answers)
Closed 4 years ago.
I need to delete a particular file content that is between these two characters /* & */ using PHP. The file from which I am trying to remove these comments is very large and includes a large data set, So optimized solution will be appreciated.
Example content:
/*SOME TEXT HERE
*/ 12314
So, the final file should contain only
1234
Here is the method that keeps on running until we got the comments string. Please note that the comments are only at one place in the file and they are always on the top of the file. Please let me know how can I delete those lines on which match the comments condition?
Below is the method that I updated.
$reading = fopen(public_path('file.csv'), 'r');
$writing = fopen(public_path('file.csv'), 'w');
$counter = 0;
$line = "";
$no_of_lines = 0;
while (!feof($reading) && $counter != 2) {
$new_line = fgets($reading);
if ($matched_string = strstr($new_line, "/*")) {
$line = $line . $matched_string;
$counter++;
} elseif ($matched_string = strstr($new_line, "*/")) {
$line = $line . $matched_string;
$counter++;
} else {
$line = $line . $new_line;
fwrite($writing, "");
}
$no_of_lines++;
}
fclose($writing);
fclose($reading);

Answer 1

First open the file but one line at a time to save memory:
<?php
$reading = fopen('myfile', 'r');
$writing = fopen('newfile', 'w');
while (!feof($reading)) {
$line = fgets($reading);
// We will put the removal logic in here
fputs($writing, $line);
}
fclose($reading);
fclose($writing);
For the removal, use some regex.
<?php
$line = preg_replace('#\/\*.+\*\/#', '/* */', $line);
You can see this working here https://3v4l.org/XmltD
If you don't want the /* either, just change the replace call to this:
$string = preg_replace('#\/\*.+\*\/#', '', $string);