Enhancement: StringHelper::isEmpty()

[np25071984]

From documentation

The following values are considered to be empty:

"" (an empty string)
0 (0 as an integer)
0.0 (0 as a float)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)

In case of "0" input value, the result isn't obvious. For me it is a string as is and the construction have to return FALSE!

So, my offer is to rely on string length instead of empty() function:

public static function isEmpty($s, $trim = true)
{
    $s = (string) $s;
    if ($trim) {
        $s = \trim($s);
    }
    return strlen($s) === 0;
}

Q	A
Yii version	2.0.?
PHP version
Operating system

[samdark]

That's simple enough check not to have a special wrapper for it:

if (\trim($string) === '') {

[np25071984]

That's simple enough check not to have a special wrapper for it:

if (\trim($string) === '') {

What about null? What about type casting (int, obj)? I use such function all the time and think it is quite useful.

[np25071984]

Wow...
It may be useful to know that trim() returns an empty string when the argument is an unset/null variable.
I didn't know that! You are right, isEmpty now useless.

[np25071984]

And one more question - I used to use helper ArrayHelper::isSet($array, $path) which takes an array and a key path and check if the path exists.

isSet([
  [
    'one' => 'One',
    'two' => [
        'label' => 'Two',
        'value' => 2
    ],
  ],
], 
'0.two.label') // true

Can I do the same by native php function?

[samdark]

No, that you cannot do with native function.

[mozarcik]

Actually he can do this

isset($arr[0]['two']['label'])

It checks for all keys and when any defined does not exist it returns false, I don't see a reason to use dot syntax here

[tomaszkane]

BTW, I like null operator on similar case:
return $array['foo']['boo'] ?? false;