这篇文章主要介绍了PHP合并数组+号和array_merge的区别,PHP的数组融合一般有两种做法,一种是直接使用加号相加,另一种则是使用array_merge函数进行相加,两者之间有点区别,需要的朋友可以参考下
PHP的数组融合一般有两种做法,一种是直接使用加号相加,另一种则是使用array_merge函数进行相加,两者之间有点区别:
1.相加会证数组中的自然index不被重置
2.相加方法中,被加的数组内的值不会被覆盖
3.merge函数中的自然index会被重置
4.merge函数,无所谓被merge和merge关系,越后面的array参数,其值,会覆盖较前面的array参数相同键的值
例子:
数组1:
- $arr1 = array(
- 10 => 'valueof10',
- 11 => 'valueof11',
- 'key1' => 'dataofkey1',
- 'key2' => 'dataofkey2',
- 'array' => array(
- 'key1' => 1,
- 'key2' => 'abc',
- 'key3' => array(
- 1, 2, 'name' => 'peter'
- ),
- ),
- );
数组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'
- ),
- ),
- );
结果比较:
- 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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