Edit report at https://bugs.php.net/bug.php?id=50434&edit=1
ID: 50434
Comment by: ajf at ajf dot me
Reported by: mail at daniel-faber dot de
Summary: add string functions str_startswith and str_endswith
for convenience
Status: Analyzed
Type: Feature/Change Request
Package: Strings related
PHP Version: 5.2.11
Block user comment: N
Private report: N
New Comment:
olafvdspek: Oh, lots of us would like it, but it apparently adds unnecessary
bloat
so we obviously can't have it, even if it would help code readability and mean
people would spend less time reinventing the wheel.
Previous Comments:
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[2013-05-15 11:07:26] olafvdspek at gmail dot com
Please?
http://stackoverflow.com/questions/834303/php-startswith-and-endswith-functions
Requests for these functions come up again and again.
Case insensitive variants might be useful too.
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[2012-08-20 21:01:08] ajf at ajf dot me
I would also like to see this. It's very handy for string checking. Both Python
and C# have such a method. (accompanied by Python's in, it's very handy) For
brevity I'd prefer startswith() and endswith(), however.
I think I'll write a patch :)
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[2009-12-10 13:19:38] mail at daniel-faber dot de
Possible problems with the above corner cases are not the main reasons why I
requested these functions. Even if I know this corner cases will not occur in
my application I'll prefer str_startswith($s, $p) to substr($s, 0, strlen($p))
== $p because it's shorter and easier to read.
This functionality is so often needed and when you need it, you have do use the
substr expression or define you own str_startswith function. So why not adding
it to the PHP core since it's such a basic thing...
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[2009-12-10 00:58:48] mail at daniel-faber dot de
rasmus, this is right in nearly all cases, but here are some corner cases where
your code fails:
startswith('', '0')
should be false, but your code gives true
reason: substr('', 0, 1) is false
false == '0' is true
if you try to fix this by replacing == with ===, another corner case will fail:
startswith('', '')
should be true, but will be false
reason: substr('', 0, 0) is false
false === '' is false
this seems to work in all cases:
function str_startswith($string, $prefix) {
if (strlen($string) < strlen($prefix))
return false;
return substr($string, 0, strlen($prefix)) == $prefix;
}
similar for endswith:
endswith('', '0') should be false, but is true
endswith('test', '') should be true, but is false
this seems to work in all cases:
function str_endswith($string, $suffix) {
$suffixLength = strlen($suffix);
if ($suffixLength == 0)
return true;
if (strlen($string) < $suffixLength)
return false;
return substr($string, -$suffixLength) == $suffix;
}
------------------------------------------------------------------------
[2009-12-09 23:48:49] [email protected]
Isn't it super trivial given the way substr works in PHP?
startswith:
substr($haystack,0,strlen($prefix)) == $prefix
endswith:
substr($haystack,-strlen($suffix)) == $suffix
Usually we add things to core that can't be done with a single trivial
call in PHP. The only thing you save is the strlen call, and you can
hardcode that to avoid it.
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