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From: Arno Welzel <usenet@arnowelzel.de>
Newsgroups: comp.lang.php
Subject: Re: set_error_handler(): duplicate error
Date: Sun, 20 Jun 2021 13:02:40 +0200
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Jerry Stuckle:

[...]
> set_error_handler() requires a real function as its parameter, not 
> something dynamically defined.

set_error_handler() requires a *callable* not a function. An anonymous
function is just fine - as this *is* a callable. This applies to *every*
function in PHP which wants a callable and is quite handy to avoid
declaring new functions if you just need it once for a specific callback:

-------------------------------------------

<?php
$array = [
    [ 'x' => 1, 'y' => 2 ],
    [ 'x' => 6, 'y' => 1 ],
    [ 'x' => 3, 'y' => 7 ],
];

usort(
    $array,
    function($a, $b) {
        if ($a['x'] == $b['x']) {
            return 0;
        } else if ($a['x'] > $b['x']) {
            return 1;
        } else {
            return -1;
        }
    }
);

print_r($array);

-------------------------------------------

Result:

Array
(
    [0] => Array
        (
            [x] => 1
            [y] => 2
        )

    [1] => Array
        (
            [x] => 3
            [y] => 7
        )

    [2] => Array
        (
            [x] => 6
            [y] => 1
        )

)



-- 
Arno Welzel
https://arnowelzel.de