CODEWITHSUNDEEP
phpsortingusort
TheAustrian
TheAustrian

Reputation: 337

usort() warning although submitting array

Why doesn't usort() sort the array?

if ( is_array( $tables ) ) {
    usort( $tables, 'sort' );
} else {
    echo "no array";
}

I always get this warning:

sort() expects parameter 1 to be array, string given

so php thinks its an array but usort() not

heres the sort function:

function sort( $a, $b ) {
    return strlen( $b ) - strlen( $a );
}

Upvotes: 1

Views: 2267

Answers (1)

gen_Eric
gen_Eric

Reputation: 227280

Note the error says sort() expects, not usort() expects. That's because PHP is interpreting the callback to usort as the built-in sort() method (which expects the 1st parameter to be an array), not your sort() method.

Try renaming your method to something else, like my_sort.

function my_sort( $a, $b ) {
    return strlen( $b ) - strlen( $a );
}

if ( is_array( $tables ) ) {
    usort( $tables, 'my_sort' );
} else {
    echo "no array";
}

Upvotes: 3

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