The solution to the error reporting problem in php using the addslashes function

If you look at the code below, can you see where the error is?

<?php
echo function_exists('addcslashes');// Detects the existence of the function 
echo get_magic_quotes_gpc().'<br/>';// Detects whether automatic escape is enabled 
echo PHP_VERSION.'<br/>';//php Version information 
echo addcslashes("Who's John Adams?");
echo '<br/>';
$str = "Who's John Adams?";
echo addslashes($str);
?> 

Does the output look like 1?
10
5.3.6
Warning: addcslashes() expects exactly 2 parameters, 1 given in /data/bookuu/test/class.php on line 50
Who\'s John Adams?

One reported an error, and the other one was output normally. Why is that?
addslashes and addcslashes are not the same as a function, found no, only a character difference.
But both functions do the same thing -- escape a string.
What's the difference?
addslashes has only one argument - a string
addcslashes requires two parameters, a string and a separator.
echo addcslashes (" Who 's John Adams?" , "'"); So I can write it like this and I can output it normally.

I hope that helps you understand the use of addslashes.

addslashes mistake

I'm going to show you a code to see if you can find any errors.

echo function_exists('addcslashes');// Detects the existence of the function 
echo get_magic_quotes_gpc().'<br/>';// Detects whether automatic escape is enabled 
echo PHP_VERSION.'<br/>';//php Version information 
echo addcslashes("Who's John Adams?");
echo '<br/>';
$str = "Who's John Adams?";
echo addslashes($str);

Can you guess if the output is 1?? A: one. B: one
I also think 1 kind of but, actually pit father!
10
5.3.6

Warning: addcslashes() expects exactly 2 parameters, 1 given in /data/bookuu/test/class.php on line 50

Who's John Adams?

One reported an error, and the other one was output normally.

Why?
addslashes and addcslashes are not the same as 1 function, found no, only 1 character difference.

But both functions do the same thing -- escape a string.
What's the difference?
addslashes has only one argument - a string
addcslashes requires two parameters, a string and a separator.
echo addcslashes (" Who 's John Adams?" , "'"); So I can write it like this and I can output it normally.