像变量一样在字符串中扩展PHP函数

Question

在PHP中，我可以说

$noun = "bird";
$adjective = "warm;
echo <<<EOT
The $noun is very $adjective
EOT;

并输出

  

鸟很温暖

有没有办法用函数做到这一点？

function getNoun() { return "bird"; }
function getAdjective() { return "warm"; }
echo <<<EOT
The getNoun() is very getAdjective()
EOT;

和输出

  

鸟很温暖

Answer 1

您可以使用variable functions，虽然他们对此感到不满，因为他们与变量变量差别不大......

$a = 'getNoun';
$b = 'getAdjective';
echo <<<EOT
The {$a()} is very {$b()}
EOT;

Answer 2

您可以在使用之前将其存储在变量中：

$noun = getNoun( );
$adj = getAdjective( );
echo <<<EOT
    The {$noun} is very {$adj}
EOT;

Answer 3

echo "The ";
echo getNoun();
echo " is very ";
echo getVerb();

或者甚至（不是100％肯定）：

echo "The " . getNoun() . " is very " . getVerb();

Answer 4

这是一个使用变量函数的解决方案，尽管不完全是：

$noun=function($type){
    return $type;
};
$adjective=function($adj){
    return $adj;
};
echo "{$noun("Robin")} was very {$adjective("Warm")}";