PHP合并數(shù)組+號(hào)和array_merge的區(qū)別

更新時(shí)間：2015年06月25日 09:49:30 投稿：junjie

這篇文章主要介紹了PHP合并數(shù)組+號(hào)和array_merge的區(qū)別,PHP的數(shù)組融合一般有兩種做法,一種是直接使用加號(hào)相加,另一種則是使用array_merge函數(shù)進(jìn)行相加,兩者之間有點(diǎn)區(qū)別,需要的朋友可以參考下

PHP的數(shù)組融合一般有兩種做法，一種是直接使用加號(hào)相加，另一種則是使用array_merge函數(shù)進(jìn)行相加，兩者之間有點(diǎn)區(qū)別：

1.相加會(huì)證數(shù)組中的自然index不被重置
2.相加方法中，被加的數(shù)組內(nèi)的值不會(huì)被覆蓋
3.merge函數(shù)中的自然index會(huì)被重置
4.merge函數(shù)，無所謂被merge和merge關(guān)系，越后面的array參數(shù)，其值，會(huì)覆蓋較前面的array參數(shù)相同鍵的值

例子：

數(shù)組1：

$arr1 = array(
  10 => 'valueof10',
  11 => 'valueof11',
  'key1' => 'dataofkey1',
  'key2' => 'dataofkey2',
  'array' => array(
    'key1' => 1,
    'key2' => 'abc',
    'key3' => array(
      1, 2, 'name' => 'peter'
    ),
  ),
);

數(shù)組2：

$arr2 = array(
  10 => 'newvalueof10',
  11 => 'newvalueof11',
  'key1' => 'newdataofkey1',
  'key3' => 'newdataofkey3',
  'array' => array(
    'key1' => 2,
    'key2' => 'defg',
    'key3' => array(
      1, 2, 'name' => 'jonathan', 'gender' => 'male'
    ),
  ),
);

結(jié)果比較：

array (size=6)
 10 => string 'valueof10' (length=9)
 11 => string 'valueof11' (length=9)
 'key1' => string 'dataofkey1' (length=10)
 'key2' => string 'dataofkey2' (length=10)
 'array' => 
  array (size=3)
   'key1' => int 1
   'key2' => string 'abc' (length=3)
   'key3' => 
    array (size=3)
     0 => int 1
     1 => int 2
     'name' => string 'peter' (length=5)
 'key3' => string 'newdataofkey3' (length=13)
 
array (size=8)
 0 => string 'valueof10' (length=9)
 1 => string 'valueof11' (length=9)
 'key1' => string 'newdataofkey1' (length=13)
 'key2' => string 'dataofkey2' (length=10)
 'array' => 
  array (size=3)
   'key1' => int 2
   'key2' => string 'defg' (length=4)
   'key3' => 
    array (size=4)
     0 => int 1
     1 => int 2
     'name' => string 'jonathan' (length=8)
     'gender' => string 'male' (length=4)
 2 => string 'newvalueof10' (length=12)
 3 => string 'newvalueof11' (length=12)
 'key3' => string 'newdataofkey3' (length=13)

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