购买力平价中有哪些匿名功能? 请让我举一个简单的例子吗?
PHP.net有关于 匿名功能,可在Wikipedia读到。
匿名功能可以用来包含无需指定和可能短期使用的功能。 一些值得注意的例子包括关闭。
<Example from PHP.net
<?php
$greet = function($name)
{
printf("Hello %s
", $name);
};
$greet( World );
$greet( PHP );
?>
<P 4.0.1至5.3>
$foo = create_function( $x , return $x*$x; );
$bar = create_function("$x", "return $x*$x;");
echo $foo(10);
<>P5.3>。
$x = 3;
$func = function($z) { return $z *= 2; };
echo $func($x); // prints 6
PHP 5.3确实支持关闭,但必须明确标明变量
$x = 3;
$func = function() use(&$x) { $x *= 2; };
$func();
echo $x; // prints 6
页: 1
http://php.net/manual/de/Functions.anonymous.php。
echo preg_replace_callback( ~-([a-z])~ , function ($match) {
return strtoupper($match[1]);
}, hello-world );
// outputs helloWorld
您作为参数(例如)使用“匿名功能”。 匿名,因为你没有像“正常”那样明确宣布职能。
function foo($match) {
return strtoupper($match[1]);
}
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