[英]Type-hint closure parameters
在PHP中使用類型提示可以對閉包的參數進行類型提示嗎?
例如
function some_function(\Closure<int> $closure) {
$closure(3);
}
// This would throw an exception
some_function(function(string $value) {
echo $value;
});
// This would work.
some_function(function(int $value) {
echo $value;
});
不是本地的。 您將需要手動使用反射 。
<?php
function some_function(\Closure $closure) {
$reflection = new ReflectionFunction($closure);
$parameters = $reflection->getParameters();
if(!isset($parameters[0]))
{
// I'm lazy but you should program this to throw a fatal exception
echo 'some_function() expects parameter one\'s closure to expect at least one parameter'.PHP_EOL;
}
elseif($parameters[0]->getType().'' !== 'int') // I'm sure there is a more elegant way to achieve this...
{
// I'm lazy but you should program this to throw a fatal exception
echo 'closure\'s first param should be an int'.PHP_EOL;
}
else
{
$closure(3);
}
}
// Does not throw an exception
some_function(function(int $value) {
var_dump($value);
});
// This throws an exception
some_function(function() {
var_dump($value);
});
// This throws an exception
some_function(function(string $value) {
var_dump($value);
});
生產:
int(3)
some_function() expects parameter one's closure to expect at least one parameter
closure's first param should be an int
另請參見推導PHP關閉參數
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