PHP 7 - Why does a method that returns the String primitive does not generate an error returning a Boolean value?
<?php
class Foo
{
public function bar() : string
{
return true;
}
}
$Foo = new Foo();
echo $Foo->bar();
?>
Output: 1
By default all code in PHP has Weak check, and to enable place a line at the top of the file including before the namespace check the types strictly (check Strong ): ( declare(strict_types = 1); ):
<?php
declare(strict_types = 1); // habilitando checagem forte
class Foo
{
public function bar(): string
{
return true;
}
}
$Foo = new Foo();
echo ($Foo->bar());
?>
there it generates erro :
Return value of Foo::bar() must be of the type string, boolean returned
References: