How to trim string from right in PHP? - php

Question

I have a string example
this-is-the-example/exa
I want to trim /exa from the above line
$string1 = "this-is-the-example/exa";
$string2 = "/exa";
I am using rtrim($string1, $sting2)
But the output is this-is-the-exampl
I want to this-is-the-example as output.
Both string are dynamic and may have multiple occurrences within the string. But I only want to remove the last part. Also its not compulsory that the string2 has / in it. this may be normal string too. like a, abc too..

Answer 1

There are various approaches you can use for this:
With substr(DEMO):
function removeFromEnd($haystack, $needle)
{
$length = strlen($needle);
if(substr($haystack, -$length) === $needle)
{
$haystack = substr($haystack, 0, -$length);
}
return $haystack;
}
$trim = '/exa';
$str = 'this-is-the-example/exa';
var_dump(removeFromEnd($str, $trim));
With regex(DEMO):
$trim = '/exa';
$str = 'this-is-the-example/exa';
function removeFromEnd($haystack, $needle)
{
$needle = preg_quote($needle, '/');
$haystack = preg_replace("/$needle$/", '', $haystack);
return $haystack;
}
var_dump(removeFromEnd($str, $trim));

Answer 2

First explode the string, remove last element from exploded array using array_pop, then implode it back again with /.
$str = "this-is-the-example/exa";
if(strpos($str, '/') !== false)
{
$arr = explode('/', $str);
array_pop($arr);
$str = implode('/', $arr);
// output this-is-the-example
}
This will work event if you have multiple / in the URL and will remove last element only.
$str = "this-is-the-example/somevalue/exa";
if(strpos($str, '/') !== false)
{
$arr = explode('/', $str);
array_pop($arr);
$str = implode('/', $arr);
// output this-is-the-example
}

Answer 3

Say hi to strstr()
$str = 'this-is-the-example/exa';
$trim = '/exa';
$result = strstr($str, $trim, true);
echo $result;

Answer 4

You can use explode
<?php
$x = "this-is-the-example/exa";
$y = explode('/', $x);
echo $y[0];

Answer 5

the second parameter of rtrim is a character mask and not a string, your last "e" is trimed and that's normal.
COnsider using something else, regexp for example (preg_replace) to fit your needs
This keeps everything before "/" char :
$str = preg_replace('/^([^\/]*).*/','$1', 'this-is-the-example/exa');
This removes the last part.
$str = preg_replace('/^(.*)\/.*$/','$1', 'this-is-the-example/exa/mple');

Answer 6

Hope this helps. :)
Simply try this code:
<?php
$this_example = substr("this-is-the-example/exa", 0, -4);
echo "<br/>".$this_example; // returns "this-is-the-example"
?>

Answer 7

To allow for error handling, if the substring is not found in the search string ...
<?php
$myString = 'this-is-the-example/exa';
//[Edit: see comment below] use strrpos, not strpos, to find the LAST occurrence
$endPosition = strrpos($myString, '/exa');
// TodO; if endPosition === False then handle error, substring not found
$leftPart = substr($myString, 0, $endPosition);
echo($leftPart);
?>
outputs
this-is-the-example