Doc #78934 [Com]: What do mbstring functions return when they fail?
Edit report at https://bugs.php.net/bug.php?id=78934&edit=1
ID: 78934
Comment by: drtechno at mail dot com
Reported by: anthony_rutledge_101 at yahoo dot com
Summary: What do mbstring functions return when they fail?
Status: Open
Type: Documentation Problem
Package: mbstring related
PHP Version: Irrelevant
Block user comment: N
Private report: N
New Comment:
Also, I should add and to remind everyone who uses php character filters like substr(), mbsubstr(),
htmlentities(), and htmlspecialchars() to always include the coding inline, as sometimes the
internal timing will return Null, then either the filter will not work, or will return an error.
like:
mb_substr($name 0, 7, $encoding="UTF-8");
htmlentities($name, $flags=ENT_QUOTES, $encoding="UTF-8");
or
htmlentities($name, ENT_QUOTES, "UTF-8");
Previous Comments:
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[2019-12-13 19:12:48] drtechno at mail dot com
well, it would be the same as substr() because its the same thing just with multi-byte characters
instead of the 7 bit ascii.
so the rules should be:
Returns the extracted part of string; or FALSE on failure, or an empty string.
False output example would be subtracting more than the length of the word, and it is being used in
a comparative state (ex: if(mb_substr($name, 0, 7)=="y"){ }).
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[2019-12-09 00:11:38] requinix@php.net
As with most other PHP functions, if there is some sort of problem then it returns false.
Looks like others don't have this documented either.
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[2019-12-09 00:03:53] anthony_rutledge_101 at yahoo dot com
Description:
------------
---
From manual page: https://php.net/function.mb-substr
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Hi. Short and sweet. Would you please add what mb_substr() returns when it fails to the manual page?
Thank you. I would have given you the answer, but my PHP 7.2.7 on Windows (legacy) does not have the
multi-byte extension installed. I'm moving to PHP 7.4 anyway.
Test script:
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The manual is the issue, not the function (as far as I know).
Still, to save you time. :-)
mb_internal_encoding("UTF-8");
$name = "Anthony";
echo $name . "<br>";
$newName = mb_substr($name, 0, 7);
echo $newName . "<br>";
$badName = mb_substr($name, 0, 20);
echo $badName . "<br>";
$badName = mb_substr($name, 20, 20);
echo $badName . "<br>";
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Edit this bug report at https://bugs.php.net/bug.php?id=78934&edit=1
Thread (5 messages)