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sort()

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<?php
$array 
=
    
// array $array

$bool sort (
    
// array &$array
    
?  // [int $sort_flags = SORT_REGULAR]
);
?>
Result
PBX error : a value cannot be passed by reference ([0 => 123])
Examples
#1 sort  (/* $array = [0 => "lemon", 1 => "orange", 2 => "banana", 3 => "apple"] */
 
$array)
#2 sort  (/* $array = [0 => "Orange1", 1 => "orange2", 2 => "Orange3", 3 => "orange20"] */
 
$array,
 
SORT_NATURAL SORT_FLAG_CASE)
#3 sort  (/* $array = [0 => "lemon"] */
 
[=> 123])
See also
Collator::asort, Collator::getSortKey, Collator::sort, Collator::sortWithSortKeys, array_multisort, array_pop, arsort, asort, collator_asort, collator_get_sort_key, collator_sort, collator_sort_with_sort_keys, krsort, ksort, natcasesort, natsort, rsort, uasort, uksort, usort