在php数组的开头插入值

Question

my array is

$hello= array( Code => 'TIR', Description => 'Tires', Price => 100 )

now i want to add a value in array beginning of an array not the end of an array.... and results i want is

$hello= array( ref=>'World', Code => 'TIR', Description => 'Tires', Price => 100 )

UPDATE

actually i need any value that is coming will be added in the beginning of an array....this is not single value.. ref=world.... this is coming from output...like if i add quantity=50, then it should be added beginning of an array before 'ref' an array should be

$hello= array(quantity=>'50', ref=>'World', Code => 'TIR', Description => 'Tires', Price => 100 )

Answer 1

I would use array_merge()

Merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one. It returns the resulting array.

$hello = array ("Code" => "Tir" .....); // you should really put quotes 
                                        // around the keys!
$world = array ("ref" => "World");

$merged = array_merge($world, $hello);

Answer 2

You can use the + operator:

$hello = array( 'Code' => 'TIR', 'Description' => 'Tires', 'Price' => 100 );
$hello = array('ref' => 'World') + $hello;
print_r($hello);

would give

Array
(
    [ref] => World
    [Code] => TIR
    [Description] => Tires
    [Price] => 100
)

Like Pekka said, you should put quotes around the keys. The PHP manual explicitly states omitting quotes is wrong usage . You might also want to check out my answer about the difference between using the + operator vs using array_merge to decide which you want to use.

Answer 3

$a= array( 'a' => 'a' );
$b = array( 'b' => 'b' );

$res = $b + $a;
//result: ( 'b' => 'b', 'a' => 'a' )

Answer 4

$ hello = array_merge（array（'ref'=>'World'），$ hello）;