The expression $value of type null|string is loosely compared to true; this is ambiguous if the string can be empty. You might want to explicitly use !== null instead.
In PHP, under loose comparison (like ==, or !=, or switch conditions),
values of different types might be equal.
For string values, the empty string '' is a special case, in particular
the following results might be unexpected:
''==false// true''==null// true'ab'==false// false'ab'==null// false// It is often better to use strict comparison''===false// false''===null// false
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28
$attribute = new StandardAttribute($name, $value);
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} else {
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$attribute = new BooleanAttribute($name);
31
}
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33
return new ArbitraryEmpty($this->name, $this->attributes->add($attribute));
royallthefourth /
html-document
In PHP, under loose comparison (like
==, or!=, orswitchconditions), values of different types might be equal.For
stringvalues, the empty string''is a special case, in particular the following results might be unexpected: