Parsing the difference between Array_merge and Array+array in PHP _php skills

Array_merge is the key that discards the original number, while the key in the string is preserved, and then a new array is formed, regardless of whether the key name is the same or not, unless the key name and value are the same and must be a string in the form of a key to merge. And Array+array is no matter what your situation is, it will only first put the previous array of data into the newly generated array, and then see whether the second array is more than the first number of arrays, many added, it is only a few numbers, but this situation it will add in: $a = array (' d ' => ' Aass ', ' e ' => ' adsdfd ', ' ASD ' => ' ASDSDD ', ' ddfg ' => ' dssdf ');

Copy Code code as follows:

$b = Array (' d ' => ' adddd ', ' adsdfd ', ' asdfsddddd ', ' 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 ' 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)