如何使用日期值对数组进行排序

Question

I generate an array with rearranged date values in it

$totert = array(
    array('2011','07','25'),
    array('2011','07','27'),
    array('2011','06','25'),
    array('2011','06','02'),
    array('2011','05','25'),
    array('2011','05','15')
);

how to arrange the value based on date i mean

• 2011-05-15
• 2011-05-25
• 2011-06-02
• 2011-06-25
• 2011-07-25
• 2011-07-27

could someone help me

Answer 1

Use usort() and provide a custom comparison function.

$totert = array(
    array('2011','07','25'), 
    array('2011','07','27'), 
    array('2011','06','25'), 
    array('2011','06','02'), 
    array('2011','05','25'), 
    array('2011','05','15')
);
usort($totert, function($a, $b) {
    return (int)implode('', $a) - (int)implode('', $b);
});

print_r(array_map(function($v) {
    return implode('-', $v);
}, $totert));