Analysis of the difference between explode and split in php

I encountered some problems when using split today. I still don’t have a deep understanding of the function, so I’ll close it up and make a mark

First let’s look at the definitions of the two methods:

Function prototype: array split (string $pattern, string $string [, int $limit])

Function prototype :array explode (string $separator, string $string [, int $limit])

At first glance, there is no difference, and they seem to have the same functions. I made this mistake. Please note that the first parameters of the two functions are string $pattern and string separator. One is that $pattern is a regular string, and the other is that $separator is an ordinary string.

Look at the following code:

$test = end(explode('.', 'abc.txt'));
echo $test;//output txt

Replace with:

$test1 = end(split('.','abc.txt'));
echo $test1;//no output

The correct way to use split is: add escape symbols

$test1 = end(split('\.','abc.txt'));
echo $test1;//output txt

Analysis: "." symbol is the keyword of regular expression, so split Invalid, while explode is valid.