38. PHP 数组运算符

数组运算符

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<?php$a = array("a" => "apple", "b" => "banana");$b = array("a" => "pear", "b" => "strawberry", "c" => "cherry");$c = $a + $b; // Union of $a and $becho "Union of \$a and \$b: \n";var_dump($c);$c = $b + $a; // Union of $b and $aecho "Union of \$b and \$a: \n";var_dump($c);?>

执行后，此脚本会显示：

Union of $a and $b:array(3) {  ["a"]=>  string(5) "apple"  ["b"]=>  string(6) "banana"  ["c"]=>  string(6) "cherry"}Union of $b and $a:array(3) {  ["a"]=>  string(4) "pear"  ["b"]=>  string(10) "strawberry"  ["c"]=>  string(6) "cherry"}

数组中的单元如果具有相同的键名和值则比较时相等。

Example #1 比较数组

<?php$a = array("apple", "banana");$b = array(1 => "banana", "0" => "apple");var_dump($a == $b); // bool(true)var_dump($a === $b); // bool(false)?>