<?$array1=array(1,2,3,4);$array2=null;$array3='non-array';$array4=array('a','b','c');print_r(array_merge($array1,$array2,$array3,$array4));?> PHP4输出的是Array{    [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 'non-array' [5] => a [6] => b [7] => c} PHP5输出的是  Warning: array_merge() [function.array-merge]: Argument #2 is not an array in C:\AppServ\www\php\php5.php on line 7  Warning: array_merge() [function.array-merge]: Argument #4 is not an array in C:\AppServ\www\php\php5.php on line 7  

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