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Hi I have an array with keys as date in this format.

$arr = array(

    "20110805" => "2",
    "20100703" => "5",
    "20110413" => "3",
    "20100805" => "4",
    "20100728" => "6",
    "20090416" => "7",
    "20080424" => "8",
    "20110819" => "1",  
);

how can I sort this array by key. Thank you.

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-1 Google: "PHP sort array by keys" – x3ro Aug 20 '11 at 21:26
-1 Google: "PHP sort array by keys" – TheHorse Aug 20 '11 at 21:31
@TheHorse - There are lots of things which can be found by googling. It's much preferred to show duplicates on SO than LMGTFY-type comments. :) – Jared Farrish Aug 20 '11 at 21:33
@Jared Farrish - SO SO SO simple question. i find answer at google with out php knowledge – TheHorse Aug 20 '11 at 21:36
@TheHorse - meta.stackoverflow.com/questions/15650/… The purpose of SO is to be a repository of information, regardless of the simplicity or complexity of the question and/or answer, as long as it fits in the rules found in the FAQ. If it's a duplicate or answered elsewhere on SO, linking to those answers are considered good etiquette. – Jared Farrish Aug 20 '11 at 21:44
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2 Answers

up vote 8 down vote accepted

With the dates in that format, an alphabetical comparison will work just fine. Use the PHP function ksort.

ksort($arr);
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2  
Example: codepad.org/5WjP74TR – Jared Farrish Aug 20 '11 at 21:26
hi thanks for your answer, ksort will sort the array by key but the key here are dates and ksort doesn't sort the array in order. i need to convert the keys to a valid date format and then do ksort, but doing that will affect the rest of the code. any suggestions?? – bharath Aug 20 '11 at 21:28
1  
@bharath - Your dates are in YEAR MONTH DAY order, which means you can sort them using a normal sort and it will put it in proper order, as long as you have 0's preprended to the short MONTHs and DAYs. Your "dates" are essentially just a number that can be parsed into a date. – Jared Farrish Aug 20 '11 at 21:31
With the data you've shown us no extra manipulation is needed, and the example Jared posted works. – coyotebush Aug 20 '11 at 21:33
@Jared Farrish - thanks, but if you look at the example in codepad you can see the order is still not right. how can i get to to be in date order? – bharath Aug 20 '11 at 21:34
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up vote 2 down vote

Just this single line of code:

ksort($arr);
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