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                ## 數組運算符 | 例子 | 名稱 | 結果 | | --- | --- | --- | | $a + $b | 聯合 | $a 和 $b 的聯合 | | $a == $b | 相等 | 如果 $a 和 $b 具有相同的鍵/值對則為 TRUE | | $a === $b | 全等 | 如果 $a 和 $b 具有相同的鍵/值對并且順序和類型都相同則為 TRUE | | $a != $b | 不等 | 如果 $a 不等于 $b 則為 TRUE | | $a <> $b | 不等 | 如果 $a 不等于 $b 則為 TRUE | | $a !== $b | 不全等 | 如果 $a 不全等于 $b 則為 TRUE | 數組的聯合 ``` <?php $a = array("a" => "apple", "b" => "banana"); $b = array("a" => "pear", "b" => "strawberry", "c" => "cherry"); $c = $a + $b; // Union of $a and $b echo "Union of \$a and \$b:" . PHP_EOL; var_dump($c); $c = $b + $a; // Union of $b and $a echo "Union of \$b and \$a:" . PHP_EOL; var_dump($c); $a += $b; // Union of $a += $b is $a and $b echo "Union of \$a += \$b:" . PHP_EOL; var_dump($a); ?> ``` > **Note:** + 運算符把右邊的數組元素附加到左邊的數組后面,兩個數組中都有的鍵名,則只用左邊數組中的,右邊的被忽略。 數組的比較 ``` <?php $a = array("apple", "banana"); $b = array(1 => "banana", "0" => "apple"); var_dump($a == $b); // bool(true) var_dump($a === $b); // bool(false) ?> ```
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