php中array_merge和array+array的差別

array_merge是丟棄原來的數字的key，而保留字串形式的key，然後組成一個新的數組，不管鍵名

是否一樣，都不合併，除非鍵名和value同時一樣並且還必須是字符串形式的key才合併。而array+array就

是不管你是什麼情況，它都只會先把前面的數組的資料先放到新生成的數組中，之後再看第二個array是否

比第一個數組個數多，多的就加進來，它只數個數，但是這種情況它會加進來：

$a = array('d'=>'aass','e'=>'adsdfd', 'asd'=>'asdsdd','ddfg'=>'dssdf');
$b = array('d'=>'adddd','adsdfd','asdfsddddd','d'=>'aass' );
$d = $a + $b;
$e = array_merge($a,$b);
var_dump($d);
var_dump($e);列印：array 'd' => string'aass ' (length=4) 'e' => string'adsdfd'

(length=6) 'asd' => string'asdsdd' (length=6) 'ddfg' => string'dssdf' (length=5) 0

=> string'adsdfd' (length=6) 1 => string'asdfsddddd' (length=10)array 'd' => string'aass' (length=4) 'e' => string'adsdfd'

(length=6) 'asd' => string'asdsdd' (length=6) 'ddfg' => string'dssdf' (length=5) 0

=> string'adsdfd' (length=6) 1 => string'asdfsddddd' (length=10)