How to split negative and positive values in string using php? - php

Question

I have a string variable in php, with look like "0+1.65+0.002-23.9", and I want to split in their individual values.
Ex:
0
1.65
0.002
-23.9
I Try to do with:
$keys = preg_split("/^[+-]?\\d+(\\.\\d+)?$/", $data);
but not work I expected.
Can anyone help me out? Thanks a lot in advance.

Answer 1

Like this:
$yourstring = "0+1.65+0.002-23.9";
$regex = '~\+|(?=-)~';
$splits = preg_split($regex, $yourstring);
print_r($splits);
Output (see live php demo):
[0] => 0
[1] => 1.65
[2] => 0.002
[3] => -23.9
Explanation
Our regex is +|(?=-). We will split on whatever it matches
It matches +, OR |...
the lookahead (?=-) matches a position where the next character is a -, allowing us to keep the -
Then we split!
Option 2 if you decide you also want to keep the + Character
(?=[+-])
This regex is one lookahead that asserts that the next position is either a plus or a minus. For my sense of esthetics it's quite a nice solution to look at. :)
Output (see online demo):
[0] => 0
[1] => +1.65
[2] => +0.002
[3] => -23.9
Reference
Lookahead and Lookbehind Zero-Length Assertions
Mastering Lookahead and Lookbehind

Answer 2

You could try this
$data = ' 0 1.65 0.002 -23.9';
$t = str_replace( array(' ', ' -'), array(',',',-'), trim($data) );
$ta = explode(',', $t);
print_r($ta);
Which gives you an array containing each field like so:
Array
(
[0] => 0
[1] => 1.65
[2] => 0.002
[3] => -23.9
)
RE: Your comment: The originals values are in a string variable only separated for a sign possitive or negative
$data = ' 0+1.65+0.002-23.9 ';
$t = str_replace( array('-', '+'), array(',-',',+'), trim($data) );
$ta = explode(',', $t);
print_r($ta);
which gives a similiar answer but with the correct inputs and outputs
Array
(
[0] => 0
[1] => +1.65
[2] => +0.002
[3] => -23.9
)