How to comment in and out php code inside a file - php

Question

Using PHP how to comment in all php code inside certain php file
for example if i've the followig file
$file = 'myfile.php';
has only PHP code
<?php
$c = 'anything';
echo $c;
?>
I want using PHP to comment in (add /* just after open tag <?php and */ just before close tag ?>) to be
<?php
/*
$c = 'anything';
echo $c;
*/
?>
And also how to do the reverse bycomment out (remove /* */) to return back to
<?php
$c = 'anything';
echo $c;
?>
I've been thinking to use array_splice then doing str_replace then using implode and file_put_contents but still unable to figure out how to do this.
Update
Okay meanwhile getting some help over here, i was thinking about it and it comes to my mind this idea .... USING ARRAY!
to add block comment /* just after open tag <?php i will convert the content of that file into array
$contents = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
and then i can array push new element at position 2 with /*
and to do the reverse i will use unset($contents[1]); to unset element at postion 2 which means, /* will be gone
later on i can file_put_contents($file, $contents); to re-write the file again.

Answer 1

You can use PREG_REPLACE :
<?php
function uncomment($file_path) {
$current = file_get_contents($file_path);
$current = preg_replace('/\\/\\*(.+?)\\*\\//s', '$1', $current);
file_put_contents($file_path, $current);
return $current;
}
echo "<plaintext>" . uncomment("code.php");
?>
BEFORE :
AFTER :

Answer 2

I don't know why you want comment or uncomment the php code but I don't think it's a good way to do. I advice you to use variable or constant, like this :
One other way to enable or disable you code, is to use constant variable after the second time :
TOGGLE/UNTOGGLE COMMENT :
You will be able to do :
uncomment("code.php", "MYENV_DEBUG"); // uncomment
uncomment("code.php", "MYENV_DEBUG"); // comment
uncomment("code.php", "MYENV_DEBUG"); // uncomment
uncomment("code.php", "MYENV_DEBUG"); // comment
FIRST TIME :
SECOND TIME :
THIRD TIME :
Code :
<?php
function uncomment_header($name, $value) {
return '<?php define("' . $name . '", ' . $value . '); ?>';
}
function uncomment($file_path, $name) {
$current = file_get_contents($file_path);
$regex = '/<\\?php define\\("' . $name . '", (0|1)\\); \\?>/';
if (preg_match($regex, $current, $match)) {
$value = ($match[1] == 1) ? 0 : 1;
$current = preg_replace($regex, uncomment_header($name, $value), $current);
} else {
$header = uncomment_header($name, 1) . "\n";
$start = 'if (' . $name . '):';
$end = 'endif;';
$current = $header . $current;
$current = preg_replace('/\\/\\*(.+?)\\*\\//s', $start . '$1' . $end, $current);
}
file_put_contents($file_path, $current);
return $current;
}
echo "<plaintext>" . uncomment("code.php", "MYENV_DEBUG");
?>

Answer 3

There are two types of comments in PHP 1)single line comment 2)Multiple line comment for single comment in php we just type // or # all text to the right will be ignored by PHP interpreter. for example
<?php
echo "code in PHP!"; // This will print out Hello World!
?>
Result: code in PHP!
For multiple line comments multiple line PHP comment begins with " /* " and ends with " / " for example
<?php
/* This Echo statement will print out my message to the
the place in which I reside on. In other words, the World. */
echo "Hello World!";
/* echo "My name is Noman Ali!";
echo "PHP Programmer!";
*/?>
Result: Hello World!

Answer 4

Like this:
#canned test data, a string and the file contents are the same
$contents = <<<'CODE'
<?php
$c = 'anything';
echo $c;
?>
CODE;
$contents = preg_replace(['/<\?php\s/','/\?\>/'], ['<?php/*', '*/?>'], $contents);
echo $contents;
Output
<?php/*
$c = 'anything';
echo $c;
*/?>
Sandbox
NOTE - this will only work if the ending tag is present. In PHP the ending tag is actually optional. This will also not work on things like short tags <? or <?= although it will catch the ending tags.
Because of these edge cases it's very hard to do with regex (or any string replacement).
Valid examples of PHP code
<?php
$c = 'anything';
echo $c;
?>
//-------- no ending tag ---------
<?php
$c = 'anything';
echo $c;
//------- short tags ---------
<? echo 'foo'; ?>
//------- short echo tags ---------
<?= $foo; ?>
etc...
Good luck if you want to try to catch them all....