Introduction to the difference between explode and split in php

First, let’s look at the definitions of the next 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. 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 code below:
Copy code The code is as follows:
$test = end(explode('.', 'abc.txt'));
echo $test;//output txt

Replace with:
Copy code The code is as follows:
$test1 = end(split('.','abc.txt'));
echo $test1;//no output

The correct way to use split is to add escape symbols
Copy code The code is as follows :
$test1 = end(split('.','abc.txt'));
echo $test1;//output txt


Analysis: "." symbol is a keyword of regular expression, so split is invalid. And explode works.