Precautions for using the array_merge() function in php array merging_PHP tutorial

$array = array('a'=>'bb');
$array2 = array('b'=>'cc');
$array3 = array_merge($array,$array2);

输出结果为

Array ( [a] => bb [b] => cc )

$array = 1;//array('a'=>'bb');
$array2 = array('b'=>'cc');
$array3 = array_merge($array,$array2);
print_r( $array3 );

$array = 1;//array('a'=>'bb');
$array2 = array('b'=>'cc');
$array3 = array_merge($array,$array2);
print_r( $array3 );

$array = 1;//array('a'=>'bb');
$array2 = array('b'=>'cc');
$array3 = array_merge((array)$array,(array)$array2);
print_r( $array3 );

The output results no longer report errors

Array ( [0] => 1 [b] => cc )