PHP echo part of a string from right to left

Question

I am trying to get the ID from the end of this string the 4305 after the -. The code below works from left to right and shows 150. How can i make it work from right to left to show the 4305 after the -?

  $mystring = "150-Adelaide-Street-Brisbane-Cbd-4305";
  $mystring = substr($mystring, 0, strpos($mystring, "-"));
  echo $mystring;

Updated: This does what i need but i'm sure there is a better way to write it:

  $mystring = "150-Adelaide-Street-Brisbane-Cbd-4305";
  $mystring = substr(strrev($mystring), 0, strpos(strrev($mystring), "-"));
  echo strrev($mystring);

Instead of strpos-forward, look for strpos-backward .. (or apply a reverse transformation or split or ..) — user166390
– user166390, Commented Jul 18, 2012 at 2:14
^ this is the most proper way - even if there's several possibilities. — Martin Zeitler
– Martin Zeitler, Commented Jan 1, 2013 at 23:44

Michael Mior · Accepted Answer · 2012-07-18 02:17:09Z

5

You can use strrpos to get the last hyphen in the string, and then take the rest of the string after this character.

$mystring = "150-Adelaide-Street-Brisbane-Cbd-4305";
$mystring = substr($mystring, strrpos($mystring, "-") + 1);
echo $mystring;

answered Jul 18, 2012 at 2:17

Michael Mior

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5 Comments

Starx Over a year ago

Ok, now tell me How easy will it be, if you want to extract Street out of the string above? You will probably write another similar line of code, right? Now if you want to call that is efficient, then I have nothing to say. But yes, if it is about just one last word. This is good.

Kris Over a year ago

What does street have to do with the price of corn in China? That wasn't the question trying to get street. He wants to get the ID at the end

Starx Over a year ago

@Kris, If you are going to go literally, the question is about getting the string right to left, ha ha. :) (Cheers)

Michael Mior Over a year ago

@Starx I'm trying to answer the question posed. If the question was to parse each piece of the string, I would have posted a different answer. I agree that if more pieces of the string are needed, this isn't the best solution.

shwebdev Over a year ago

Yes, i was just after the ending ID glad you guys understood it :)

Michael Berkowski · Accepted Answer · 2012-07-18 02:25:32Z

4

Split it on the - into an array, and pop off the last element:

$mystring = "150-Adelaide-Street-Brisbane-Cbd-4305";
$parts = explode("-", $mystring);
echo array_pop($parts);

Or, if you need to keep the array intact, use end() to advance to the last element and return it:

echo end($parts));

This is less efficient than using strrpos(), but in cases when that isn't an issue I'll tend to use this method since it doesn't require me to think much about string indices and if what you need isn't in the first or last delimited position, it's a bit easier to pull an array index than to do the string manipulation needed to pull from the internal parts.

edited Jul 18, 2012 at 2:25

answered Jul 18, 2012 at 2:17

Michael Berkowski

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3 Comments

Michael Mior Over a year ago

There's no need to split up the entire string.

Ghassan Idriss Over a year ago

I agree, explode function seems like the best solution. I think he wants to get the ID from the string so using the end() function would be the function to use.

Martin Zeitler Over a year ago

Definitely less prone to errors with the position. I used to retrieve last element with $parts[sizeof($parts)-1] ... end() function was new to me in this context, have to remember that.

Kris · Accepted Answer · 2012-07-18 02:19:54Z

2

If your like one of my coworkers who likes to use regex for EVERYTHING... then

  $mystring = "150-Adelaide-Street-Brisbane-Cbd-4305";
  preg_match('~-(\d+)$~', $mystring, $matches);
  echo $matches[1];

answered Jul 18, 2012 at 2:19

Kris

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2 Comments

Martin Zeitler Over a year ago

array / string functions might perform faster (not bench-marked in detail - but have a feeling). The required matching is way to simple that it would require regex '/.*-(\d+)$/' would rather match the requirements - that's several digits from the end of the string. Voted up for a possible solution - but please update the pattern, tested it and the match fails after step 1).

Martin Zeitler Over a year ago

Get your coworker one of these: regexbuddy.com. Guess he/she would completely go nuts with it, it's a great tool for building up more complex expressions and for testing their performance.

Starx · Accepted Answer · 2012-07-18 02:27:40Z

0

Most easiest way is definitely using explode.

By using explode, you can split the string into an array with each parts accessible as individual identifiers using the indexes.

Usage Example:

  $mystring = "150-Adelaide-Street-Brisbane-Cbd-4305";
  $mystring = explode("-", $mystring);
  echo $mystring[count($mystring)-1]; //Extract the last item

edited Jul 18, 2012 at 2:27

answered Jul 18, 2012 at 2:19

Starx

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1 Comment

Michael Mior Over a year ago

I wouldn't say this is the easiest and certainly not the most efficient.

Martin Zeitler · Accepted Answer · 2013-01-01 23:54:06Z

0

As Matthew posted in comments above, reverse scan is faster since the match is done after 4 steps only - guess there's no "more proper way" to translate the requirements into PHP syntax (this is also the way how they teached me when I learnt C syntax):

echo substr($mystring, strrpos($mystring, "-") + 1);

PHP manual.

edited Jan 1, 2013 at 23:54

answered Jan 1, 2013 at 23:48

Martin Zeitler

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