PHP using foreach on a sorted array

Question

Hi all I have an array I am storing timestamps in. I then sort them using asort() and then I want to go through each one with a foreach but I get an invalid argument supplied error here is what I have:

$sorted_dates = asort($dates_to_sort);

var_dump:

array(4) { [2]=> int(1512086400) [3]=> int(1512432000) [1]=> int(1513036800) [0]=> int(1514073600) }

Foreach:

foreach ($sorted_dates as $value) {
    echo "<br>".$value."<br>";
}

Error:

Warning: Invalid argument supplied for foreach()

Any idea how I can go through the array as I need to do more than echo it.

teeyo · Accepted Answer · 2017-11-20 10:17:58Z

5

asort returns a boolean and you can't iterate over a boolean!

// your code should be like
asort($dates_to_sort);
foreach ($dates_to_sort as $value) {
    echo "<br>".$value."<br>";
}

answered Nov 20, 2017 at 10:17

teeyo

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mega6382 · Accepted Answer · 2017-11-20 10:18:07Z

1

you need to pass $dates_to_sort to foreach() not $sorted_dates. Like:

foreach ($dates_to_sort as $value) {
    echo "<br>".$value."<br>";
}

Because asort() takes the input by reference and return bool. See:

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

answered Nov 20, 2017 at 10:18

mega6382

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Comments

Richard Parnaby-King · Accepted Answer · 2017-11-20 10:18:27Z

0

asort will sort the array by reference, returning a boolean true/false if the sorting was successful or not.

asort($dates_to_sort);
foreach ($dates_to_sort as $value) {
    echo "<br>".$value."<br>";
}

answered Nov 20, 2017 at 10:18

Richard Parnaby-King

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