[알고리즘] 배열 역순

· 2014-09-24 (수) 16:30:15 · 4106
// 배열 역순
function reverse(&$a) {
    $start = 0; // 배열시작 인덱스 
    $count = count($a);
$end = $count - 1; // 배열끝 인텍스,  0 부터 시작하니 배열갯수에서 1을 뺌

    while ($start < $count/2) {
        /* 요소 교체 */
        $temp = $a[$end];
        $a[$end--] = $a[$start];
        $a[$start++] = $temp;
    }
}
$a = array(1,2,3,4,5,6,7,8,9);

foreach ($a as $k => $v) echo($a[$k]);
echo '<br />';

reverse($a);

foreach ($a as $k => $v) echo($a[$k]);

 

/* output 

123456789

987654321

*/ 

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