PHP迭代

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<?php

function
f($n) {

    $before_1
= 1;

    $before_2
= 1;

    for( $i
= 3;$i
<= $n;++$i
) {

        $item
= $before_1
+ $before_2;

        $before_2
= $before_1;

        $before_1
= $item;

    }

    return
$item;

}

echo
f(10);

?>

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<?php

function
f($n) {

    if($n
== 1 || $n
== 2) {

        return
1;

    }

    return
f($n-1) + f($n-2);

}

echo
f(10);

?>

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<?php

$sayHello
= function
($name) {

    echo
‘Hello, ‘,$name;

};

$sayHello(‘evilxr‘);

?>

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<?php

$v1
= ‘evilxr‘;

$func
= function
() use($v1){

    var_dump($v1);

};

$func();

?>