我们首先给出两个数组
代码如下:
PHP
$r = array(1,2,3,4,5,6);
$e = array(7,8,9,10);
?>
$r = array(1,2,3,4,5,6);
$e = array(7,8,9,10);
?>
下面我们用array_merge和加号来何必这两数组
代码如下:
PHP
print_r($r+e); // 输出 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )
print "
";
print_r(array_merge($r,$e)); // 输出 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 )
?>
print_r($r+e); // 输出 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )
print "
";
print_r(array_merge($r,$e)); // 输出 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 )
?>
从这里可以看出，用array_merge合并数组一个数组中的值附加在前一个数组的后面。返回作为结果的数组如果数组包含数字键名，后面的值将不会覆盖原来的值，而是附加到后面。 然而用加号来合并数组如果键名相同，则取最先出现的数组值，后面的就直接忽略掉
下面我们来改变下前面给出的数组
代码如下:
PHP
$r = array('r'=>1,6);
$e = array(7,10);
?>
$r = array('r'=>1,6);
$e = array(7,10);
?>
代码如下:
PHP
print_r($r+e); // 输出Array ( [r] => 1 [0] => 2 [1] => 3 [2] => 4 [3] => 5 [4] => 6 )
print "
";
print_r(array_merge($r,$e)); // 输出Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 )
?>
print_r($r+e); // 输出Array ( [r] => 1 [0] => 2 [1] => 3 [2] => 4 [3] => 5 [4] => 6 )
print "
";
print_r(array_merge($r,$e)); // 输出Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 )
?>
从这里可以看出，用array_merge合并数组一个数组中的值附加在前一个数组的后面。如果非数字键名相同，则后面数组的值会覆盖前面数组的值。 然而用加号来合并数组如果键名相同，则取最先出现的数组值，后面的就直接忽略掉
