This article provides a detailed analysis of the differences between array_merge and array + array in php. For more information, see array_merge, which discards the key of the original number, the key in the string form is retained, and then a new array is formed, no matter whether the key name is the same or not, it is not merged, unless the key name and value are the same and must also be a string type key, the key is merged. Array + array is no matter what the situation is, it will only put the data in the previous array first into the newly generated array, then let's see if the second array has more numbers than the first array. if there are more, we will add it. it only counts, but in this case it will be added in: $ a = array ('D' => 'aass ', 'E' => 'adsdfs', 'asd' => 'asdsdd ', 'ddfg' => 'dssdf ');
The code is as follows:
$ B = array ('D' => 'adddd', 'adsdfs', 'asdfsdddd', 'D' => 'aass ');
$ D = $ a + $ B;
$ E = array_merge ($ a, $ B );
Var_dump ($ d );
Var_dump ($ e );
Print:
Array
'D' => string 'aass '(length = 4)
'E' => string 'adsdfs' (length = 6)
'Asd '=> string 'asdsdd' (length = 6)
'Ddfg' => string 'dssdf '(length = 5)
0 => string 'adsdfs' (length = 6)
1 => string 'asdfsddddd' (length = 10)
Array
'D' => string 'aass '(length = 4)
'E' => string 'adsdfs' (length = 6)
'Asd '=> string 'asdsdd' (length = 6)
'Ddfg' => string 'dssdf '(length = 5)
0 => string 'adsdfs' (length = 6)
1 => string 'asdfsddddd' (length = 10)
