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? ??? ?? PHP ???? ??? ??? ???? PHP? Foreach ???? ??? ??? ???? ??? ??????

??? ??? ???? PHP? Foreach ???? ??? ??? ???? ??? ??????

Nov 16, 2024 pm 07:08 PM

Why Does the Last Element Duplicate in PHP's Foreach Loop with Pass-by-Reference?

PHP Foreach Pass by Reference Enigma: ??? ??? ?? ??

PHP?? foreach ??? pass-by- ?? ??(?: foreach($arr as &$item)), ??? ?? ??? ??? ? ????. ??? ?? ??? ?? ??? ???.

$arr = ["foo", "bar", "baz"];

foreach ($arr as &$item) { /* do nothing by reference */ }
print_r($arr);

foreach ($arr as $item) { /* do nothing by value */ }
print_r($arr); // $arr has inexplicably changed

? ??? ??? ?????.

Array
(
    [0] => foo
    [1] => bar
    [2] => baz
)
Array
(
    [0] => foo
    [1] => bar
    [2] => bar
)

?? ??

? ?? foreach ?? ??? ? ??? $arr? ??? $item?? ?????. ? ?? ??? ???? ? ??? ?? ??? ??? ??? $item? ??? ?????. ?? $arr? ? ??? $arr[2]? ??? ???? ??? ??? ??? ????? ?????.

?? ???

? ??? ???? ?? ? foreach ??? print ?? ???? ??? ???? ?????.

foreach ($arr as &$item) {
    echo "Item: $item<br>";
    print_r($arr);
    echo "<br>";
}

foreach ($arr as $item) {
    echo "Item: $item<br>";
    print_r($arr);
    echo "<br>";
}

? ??? ??? ????.

Item: foo
Array ( [0] => foo [1] => bar [2] => baz )

Item: bar
Array ( [0] => foo [1] => bar [2] => baz )

Item: baz
Array ( [0] => foo [1] => bar [2] => baz )

Item: foo
Array ( [0] => foo [1] => bar [2] => foo )

Item: bar
Array ( [0] => foo [1] => bar [2] => bar )

Item: bar
Array ( [0] => foo [1] => bar [2] => bar )

$arr? ? ?? foreach ?? ?? ??? ??? ??? ???? $item ??? ?????.

?? ?? ??? ???

??? ??? ??? ????. ??? ??? ?????. foreach ??? ??? ?? ??? ?? ?? ??? ??? ??? ?????. ? ?? $item? ???? ? ?? ???? ?? ?? ??? ?????. ?? ?? ??? ?????.

for ($i = 0; $i < count($arr); $i++) {
    $arr[$i] = $item;
}

??? ??? ??? ??? ??? PHP?? ??? ??? ?? ??? ?????. ??? ??? ????? ??? ? ??? ?? $item? ???? ? ?? foreach ???? ?? ??? ?????. foreach($arr? $item??).

? ??? ??? ??? ???? PHP? Foreach ???? ??? ??? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

? ????? ??
? ?? ??? ????? ???? ??? ??????, ???? ?????? ????. ? ???? ?? ???? ?? ??? ?? ????. ???? ??? ???? ???? ??? ?? admin@php.cn?? ?????.

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Undresser.AI Undress

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???? ?? ??? ??? ?? AI ?? ?

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???? ?? ???? ??? AI ?????.

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Video Face Swap

??? ??? AI ?? ?? ??? ???? ?? ???? ??? ?? ????!

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???? ?? ?? ?? ???

SublimeText3 ??? ??

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