[php] Remove the last character from a string

What is fastest way to remove the last character from a string?

I have a string like

a,b,c,d,e,

I would like to remove the last ',' and get the remaining string back:

OUTPUT: a,b,c,d,e

What is the fastest way to do this?

An alternative to substr is the following, as a function:

substr_replace($string, "", -1)

Is it the fastest? I don't know, but I'm willing to bet these alternatives are all so fast that it just doesn't matter.

You can use

substr(string $string, int $start, int[optional] $length=null);

See substr in the PHP documentation. It returns part of a string.

You can use substr:

echo substr('a,b,c,d,e,', 0, -1);
# => 'a,b,c,d,e'