Remove string after last hyphen [duplicate] - php

Question

This question already has answers here:
How to remove part of a string after last comma in PHP
(3 answers)
Closed 3 years ago.
I would like to remove the last hyphen and anything after it in a string. After looking I found something that does the first hyphen but not last:
$str = 'sdfsdf-sdfsdf-abcde';
$str = array_shift(explode('-', $str));
Current String
$str = 'sdfsdf-sdfsdf-abcde';
Desired Result
$str = 'sdfsdf-sdfsdf';

Answer 1

You can use this preg_replace:
$repl = preg_replace('/-[^-]*$/', '', $str);
//=> sdfsdf-sdfsdf
-[^-]*$ will match - followed by 0 or more non-hyphen characters before end of line.

Answer 2

You can use strrpos to get the last index, and then use substr to get the desired result.
$str = 'sdfsdf-sdfsdf-abcde';
$pos = strrpos($str , "-");
if ($pos !== false) {
echo substr($str, 0, $pos);
}

Answer 3

You're close. Just use array_pop() instead of array_shift(). array_pop() removes last element of array. You need, of course, use implode() later to put the strign together again.
$arr = explode('-', $str);
array_pop($arr);
$str = implode('-', $arr);
It's important not to do that in one line since array_pop() works on a reference to the array and it modfies it, and then returns only removed element.
There are a few other possible solutions mentions by other answers.

Answer 4

This is a little bulky but it will work for you:
$str = 'sdfsdf-sdfsdf-abcde';
$pieces = explode("-",$str);
$count = count($pieces);
for ($x = 0; $x <= $count - 2; $x++) {
$desired_result .= $pieces[$x].'-';
}
$desired_result = substr($desired_result, 0, -1);
echo $desired_result;
if you have a lot of them you can use this function:
function removeLast($str){
$pieces = explode("-",$str);
$count = count($pieces);
for ($x = 0; $x <= $count - 2; $x++) {
$desired_result .= $pieces[$x].'-';
}
$desired_result = substr($desired_result, 0, -1);
return $desired_result;
}
you call it by:
$str = 'sdfsdf-sdfsdf-abcde';
$my_result = removeLast($str);