How can I pass one or more variables of type array to another page via $_GET?
I always passed variable values in the form ?a=1&b=2&c=3
What about passing a=[1,2,3]
?
Do I need to write a for loop and append all the values?
Thanks
You can use the []
syntax to pass arrays through _GET:
?a[]=1&a[]=2&a[]=3
PHP understands this syntax, so $_GET['a']
will be equal to array(1, 2, 3)
.
You can also specify keys:
?a[42]=1&a[foo]=2&a[bar]=3
Multidimentional arrays work too:
?a[42][b][c]=1&a[foo]=2
http_build_query()
does this automatically:
http_build_query(array('a' => array(1, 2, 3))) // "a[]=1&a[]=2&a[]=3"
http_build_query(array(
'a' => array(
'foo' => 'bar',
'bar' => array(1, 2, 3),
)
)); // "a[foo]=bar&a[bar][]=1&a[bar][]=2&a[bar][]=3"
An alternative would be to pass json encoded arrays:
?a=[1,2,3]
And you can parse a
with json_decode
:
$a = json_decode($_GET['a']); // array(1, 2, 3)
And encode it again with json_encode:
json_encode(array(1, 2, 3)); // "[1,2,3]"
Dont ever use serialize()
for this purpose. Serialize allows to serialize objects, and there is ways to make them execute code. So you should never deserialize untrusted strings.