sort multidimensional array

[bluecoder]

I have this array:
Array
(
[0] => Array
(
[title] => Mr
[firstname] => Bob
[surname] => Smith
[relation] => Principal
[dob] => 3/08/1980
)

[1] => Array
    (
        [title] => Mr
        [firstname] => Ronald
        [surname] => Thomas
        [relation] => Friend
        [dob] => 10/12/1979
    )

[2] => Array
    (
        [title] => Mr
        [firstname] => Brendan
        [surname] => Person
        [relation] => Dependant
        [dob] => 9/12/1999
    )

)

I want to sort by dob. Is it possible to do that with php array function?

[laserlight]

I suggest that you check out [man]usort/man, possibly with [man]create_function/man (but that's optional).

[bluecoder]

I read through many array sorting function including usort. The thing is I have no idea how to sort it by dob which is the second array element of the array.

[laserlight]

Well, it depends on how exactly you want to compare the date. For example, you could write:

usort($array, create_function('$a,$b', 'return strtotime($a["dob"]) - strtotime($b["dob"]);'));

[bluecoder]

I get this :

Array
(
[0] => Array
(
[name] => name4
[date] => 01/04/1976
)

[1] => Array
    (
        [name] => name3
        [date] => 01/01/1980
    )

[2] => Array
    (
        [name] => name2
        [date] => 01/01/1976
    )

[3] => Array
    (
        [name] => name1
        [date] => 03/01/1977
    )

)

It doesn't seems to sort corectly according to dob..

[bluecoder]

I try change the date format from dd/mm/yyyy to yyyy-mm-dd but still doesn't work

Here is my code:
$arraydate = array(array(name=>'name1',date =>'1977-03-01'), array (name=>'name2',date =>'1976-01-01'), array (name=>'name3',date =>'1980-01-01'), array (name=>'name4',date =>'1976-04-04') );

usort($arraydate, create_function ('$a,$b', 'return strtotime($a["dob"]) - strtotime($b["dob"]);'));

print_r($arraydate);

For testing purpose, I shorten my array element to two.

[bluecoder]

Sorry , it works now . Its because I use date instead of dob.. And also it doesn't matter whether I use both format
Thank you very much

[bluecoder]

I share the full working testing code here for whoever need it.
And million thanks to laserlight .. .I fully agree you are PHP witch ..:-)

$arraydate = array(array(name=>'name1',dob =>'03/01/1977'), array (name=>'name2',dob =>'01/01/1996'), array (name=>'name3',dob =>'01/01/1980'), array (name=>'name4',dob =>'01/04/1976') );

usort($arraydate, create_function('$a,$b', 'return strtotime($a["dob"]) - strtotime($b["dob"]);'));
print_r($arraydate);

[laserlight]

You're welcome 🙂
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