Sorting the array from an exploded string returns true instead of the sorted array [duplicate]

Question

I have the following string which I am trying to explode and sort from earliest date to latest date:

$dates = '2010-11-05,2010-11-05,2010-11-06,2010-11-06,2010-11-07,2010-11-07,2010-11-08';

I've obviously tried sort(explode(',', $dates)); as well as usort, setting different sort flags, but this just returns true.

Which array sorting function am I looking for?

You should have gotten a warning saying "Only variables should be passed by reference". That should have clued you in to the problem. — Barmar
– Barmar, Commented Jan 29 at 23:51

Álvaro González · Accepted Answer · 2010-11-04 11:36:30Z

8

<?php

$dates = '2010-11-05,2010-11-05,2010-11-06,2010-11-06,2010-11-07,2010-11-07,2010-11-08';

$array = explode(',', $dates);
sort($array);

print_r($array);

If you look carefully at the manual page for sort() you'll see that it receives its argument by reference:

bool sort ( array &$array [, int $sort_flags = SORT_REGULAR ] )

If you don't feed it with a variable, the results of the sorting will be lost since they can't be stored anywhere.

answered Nov 4, 2010 at 11:36

Álvaro González

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Mchl · Accepted Answer · 2010-11-04 11:34:01Z

1

$dates = "2010-11-05,2010-11-05,2010-11-06,2010-11-06,2010-11-08,2010-11-06,2010-11-08";
$da = explode(',',$dates);
sort($da);
var_dump($da);

answered Nov 4, 2010 at 11:34

Mchl

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