CODEWITHSUNDEEP
php
Chumblechops
Chumblechops

Reputation: 328

PHP trim() removing S when it's not specified

Using PHP 7.2.8

I have a strange situation regarding the trim() function in PHP. To exemplify, lets say I make this statement:

echo trim("sacas",",\s");

I get 

aca

as a result. Further, if I make a slightly different call:

echo trim("  sacas",",\s")

I get

  saca

(if it's hard to see, the leading spaces are still there).

As best as I can tell, what is happening is that trim, which removes all leading and trailing characters that match a specified set, is removing all s characters, and ignoring whitespace. However /s is supposed to represent whitespace characters, and not match s at all.

Any ideas why this is happening? And if so, how can I remove the whitespace while leaving the s characters?

As a note, my problem requires that I trim both commas AND whitespace out, so I can't simply just use trim() with no extra arguments, which does leave s alone

Upvotes: 1

Views: 184

Answers (4)

Zoe Edwards
Zoe Edwards

Reputation: 13667

trim() accepts a a list of stripped characters – not a group, or regex.

So writing sacas means , s, a, c, a, and s.

I think you’re looking for preg_replace:

preg_replace('/,\s/', '', 'sacas')

Edit: From Peter’s comment, maybe something like this:

preg_replace('/^(,|\s)+|(,|\s)+$/', '', 'sacas')

Upvotes: 3

rf1234
rf1234

Reputation: 1605

"As a note, my problem requires that I trim both commas AND whitespace out, so I can't simply just use trim() with no extra arguments, which does leave s alone"

This only removes leading and trailing whitespace and commas.

echo trim("   sacas, ",", ");

returns 

sacas

Upvotes: 0

Victor
Victor

Reputation: 5769

You must specify all the characters you want to strip (that is, you cannot use regular expression). So, to trim whitespaces and commas, you need:

echo trim("  sacas", ", \t\n\r\0\x0B");

Upvotes: 5

Joni
Joni

Reputation: 111239

To remove leading and trailing commas and spaces, you need to use " ,": 

echo trim(" , asd, asd, ,  ,", " ,");
// output: asd, asd

If you need to include more types of whitespace (tab, new line, form feed) you need to include them in the string, for example " ,\t\n\r\0\x0B"

Upvotes: 0

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