I recently got into a discussion with coworkers about the more compact functionality of the terabyte (x?: 10) and some of them said that it would be removed in php 7. I did a web search and found nothing related to that.
Is there any information on this?
The name of this operator is elvis operator .
It still exists in PHP 7. It may be just a matter of compatibility or even aiming for comfort for those who are already accustomed, but only those who develop the language can respond with certainty.
In PHP 7 there is null coalescing operator ( ?? ) and this operator does the same see edit .
The main difference between them is that null coalesce will not generate a E_NOTICE when the variable is not defined.
$a = null;
print $a ?? 'não há valor'; // Saída: não há valor
print $a ?: 'não há valor'; // Saída: não há valor
print $b ?? 'não há valor'; // Saída: não há valor
print $b ?: 'não há valor'; // Notice: Undefined variable: b
They do not do exactly the same thing, there is an important difference not yet mentioned. The null coalescing ( ?? ) operator evaluates its second expression only if the first expression is null or not yet assigned. Ex.:
null ?? 'Teste' == 'Teste';
The Elvis operator evaluates the second expression only if the first expression is falsy , that is, a value that, if converted to boolean , has the value false . See this answer with a more detailed explanation. Ex.:
0 ?: 'Teste' == 'Teste';
Some examples that demonstrate the difference between operators:
null ?: 'Nope' == Nope
null ?? 'Nope' == Nope
'' ?: 'Nope' == Nope
'' ?? 'Nope' == ''
' ' ?: 'Nope' == ' '
' ' ?? 'Nope' == ' '
false ?: 'Nope' == Nope
false ?? 'Nope' == false
0 ?: 'Nope' == Nope
0 ?? 'Nope' == 0
1 ?: 'Nope' == 1
1 ?? 'Nope' == 1
[] ?: 'Nope' == Nope
[] ?? 'Nope' == []
Repl.it with the working code.