PHP 的 array merge 與 + 號的差別

PHP 的 array merge 與 + 號的區別

PHP 的 array_merge 會將 數值 變成 0, 1, 2..., 就算是強制轉換成字串也一樣.

範例 - 使用 array_merge

$a1 = array(
??? '9' => '0',
??? '311' => '1',
??? '快樂' => '2',
??? '2009a' => '3');

$a2 = array(
??? '2009' => '11',
??? '聖誕節' => '22',
??? '111a' => '33');

$amerge = array();

$amerge = array_merge($a1, $a2);

print_r($amerge);
?>

輸出結果

Array
(
??? [0] => 0
??? [1] => 1
??? [快樂] => 2
??? [2009a] => 3
??? [2] => 11
??? [聖誕節] => 22
??? [111a] => 33
)

於 官方網站查(array_merge), 使用 "+" 就可以 merge, 而且會將 key(hash、index) 值保留.

範例 - 使用 + 合并

$a1 = array(
??? '9'???? => '0',
??? '311'?? => '1',
??? '快樂'?? => '2',
??? '2009a' => '3'
);

$a2 = array(
??? '2009'? => '11',
??? '聖誕節' => '22',
??? '111a'? => '33'
);

$amerge = array();

$amerge = $a1 + $a2;

print_r($amerge);
?>

輸出結果

Array
(
??? [9] => 0
??? [311] => 1
??? [快樂] => 2
??? [2009a] => 3
??? [2009] => 11
??? [聖誕節] => 22
??? [111a] => 33
)

原文網站 / 轉載自: Tsung Hao

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