PHP: best method to trim a substring from a string

Question

Want to process a set of strings, and trim some ending "myEnding" from the end of each string if it exists.

What is the simplest way to do it? I know that everything is possible with regexp, but thus seems to be a simple task, and I wonder whether a simpler tool for this exists.

Thanks

Gidi

You might find s($str)->replaceSuffix('myEnding') helpful, as found in this standalone library. — caw
– caw, Commented Jul 28, 2016 at 4:11

dqhendricks · Accepted Answer · 2011-01-09 03:07:29Z

15

ima go with preg_replace on this one.

$output = preg_replace('/myEnding$/s', '', $input);

answered Jan 9, 2011 at 3:07

dqhendricks

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5 Comments

shealtiel Over a year ago

Tanks for the valuable answer, even though I asked for non regexp solutions

dqhendricks Over a year ago

you asked for the simplest way to do it. in this case, regex was the simplest way.

userlond Over a year ago

Regexp is a hero :)

marcguyer Over a year ago

If your string to remove (e.g., myEnding) is from user input or otherwise can't be trusted, be sure to use preg_quote(). So, something like this: $output = preg_replace('/' . preg_quote($myEnding) . '$/s', '', $input);

Steve Horvath Over a year ago

I'm willing to bet this is the slower solution, regexp is not really efficient for simple tasks like this.

Mark Byers · Accepted Answer · 2011-01-09 03:04:32Z

7

Try this:

$s = "foobarmyEnding";
$toRemove = "myEnding";

$len = strlen($toRemove);
if (strcmp(substr($s, -$len, $len), $toRemove) === 0)
{
    $s = substr($s, 0, -$len);
}

ideone

edited Jan 9, 2011 at 3:04

answered Jan 9, 2011 at 2:58

Mark Byers

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1 Comment

Steve Horvath Over a year ago

This is probably much faster than regex for such a simple task.

karthikr · Accepted Answer · 2012-10-11 02:45:57Z

-6

rtrim http://php.net/manual/en/function.rtrim.php

$str = "foobarmyEnding";
$str = rtrim($str, 'myEnding');
// str == "foobar"

ltrim is the same deal for the start of a string http://php.net/manual/en/function.ltrim.php

You could also use str_replace to replace a search term with with an empty string but its slower then rtrim/ltrim if you need to amend the start or end of a string

edited Oct 11, 2012 at 2:45

karthikr

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answered Jul 19, 2012 at 11:01

Mike Sherman

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3 Comments

TaZ Over a year ago

Not really. The second parameter to rtrim is a list of characters to strip. It's not handled as an entire string.

Mike Sherman Over a year ago

The question was "trim some ending "myEnding" from the END of each string"

TaZ Over a year ago

If your string contains any of those characters directly before "myEnding", they will get stripped as well. Let me give an example: what happens when you input "HelloMikeShermanmyEnding". You'd expect the output to be "HelloMikeSherman" but the output will be "HelloMikeSherma"! Because "n" is part of the character list provided to rtrim.

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