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$arr = array("ccc", "aaaaaaaaaaaaaaa", "ddddddd", "b"); sort($arr); print_r($arr); /* run: Array ( [0] => aaaaaaaaaaaaaaa [1] => b [2] => ccc [3] => ddddddd ) */
$arr = array(7, 3, 1, 2, 4); sort($arr); print_r($arr); /* run: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 7 ) */
$arr = array(7, 3, 1, 2, 4); rsort($arr); print_r($arr); /* run: Array ( [0] => 7 [1] => 4 [2] => 3 [3] => 2 [4] => 1 ) */
$arr = array("ccc", "aaaaaaaaaaaaaaa", "ddddddd", "b"); rsort($arr); print_r($arr); /* run: Array ( [0] => ddddddd [1] => ccc [2] => b [3] => aaaaaaaaaaaaaaa ) */
$arr = array("C"=>"95", "C++"=>"85", "PHP"=>"75"); asort($arr); // Ascending Order by Value print_r($arr); /* run: Array ( [PHP] => 75 [C++] => 85 [C] => 95 ) */
$arr = array("C"=>"95", "C++"=>"85", "PHP"=>"75"); ksort($arr); // Ascending Order by Key print_r($arr); /* run: Array ( [C] => 95 [C++] => 85 [PHP] => 75 ) */
$arr = array("C"=>"95", "C++"=>"85", "PHP"=>"75"); arsort($arr); // Descending Order by Value print_r($arr); /* run: Array ( [C] => 95 [C++] => 85 [PHP] => 75 ) */
$arr = array("C"=>"95", "C++"=>"85", "PHP"=>"75"); krsort($arr); // Descending Order by Key print_r($arr); /* run: Array ( [PHP] => 75 [C++] => 85 [C] => 95 ) */