Notes for using the php array merge array_merge () function

1. array_merge () merge

Example

The code is as follows:	Copy code
$ Array = array ('a' => 'BB '); $ Array2 = array ('B' => 'CC '); $ Array3 = array_merge ($ array, $ array2 ); The output result is Array ([a] => bb [B] => cc)

The above is no problem because it is an array. Let's set $ array as an array to see what's going on.

The code is as follows:	Copy code
$ Array = 1; // array ('a' => 'BB '); $ Array2 = array ('B' => 'CC '); $ Array3 = array_merge ($ array, $ array2 ); Print_r ($ array3 );

Running result

Warning: array_merge () [function. array-merge]: Argument #1 is not an array in E: test1.php on line 4

It tells us that an array is required, so there are many ways to solve this problem,

1. I used is_array () to determine the data type. However, I found that it is unreasonable to merge multiple arrays. Later I found that the data type can be converted.

The code is as follows:	Copy code
$ Array = 1; // array ('a' => 'BB '); $ Array2 = array ('B' => 'CC '); $ Array3 = array_merge (array) $ array, (array) $ array2 ); Print_r ($ array3 ); No error is reported for the output. Array ([0] => 1 [B] => cc)

He automatically converts number 1 to an array, so you must pay attention to these details when using it.