[PHP] 배열

PHP

[PHP] 배열

헤이봄봄 2022. 6. 14. 18:42

배열의 크기

<html>
    <body>
        <?php
        $l = [1, 2, 3, 4, 5];
        echo count($l);
        ?>
    </body>
</html>


// 5

배열 조작

push, pop, shift, unshift

<html>
    <body>
        <?php
        $arr = ['a', 'b', 'c', 'd', 'e'];
        array_push($arr, 'f');
        var_dump($arr);
        ?>
    </body>
</html>


// array(6) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" [4]=> string(1) "e" [5]=> string(1) "f" }

배열 정렬

sort, rsort(반대 정렬)

<html>
    <body>
        <?php
        $li = ['c', 'a', 'b'];
        sort($li);
        var_dump($li);
        ?>
    </body>
</html>

// array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }

기타 공식문서

https://www.php.net/manual/en/ref.array.php

PHP: Array Functions - Manual

While PHP has well over three-score array functions, array_rotate is strangely missing as of PHP 5.3. Searching online offered several solutions, but the ones I found have defects such as inefficiently looping through the array or ignoring keys. The follow

www.php.net

연관배열의 생성

// (1)
<html>
    <body>
        <?php
            $grades = array('egoing'=>10, 'k8805'=>6, 'sorialgi'=>80);
            var_dump($grades)
        ?>
    </body>
</html>

// array(3) { ["egoing"]=> int(10) ["k8805"]=> int(6) ["sorialgi"]=> int(80) }

// (2)
<html>
    <body>
        <?php
            $grades = [];
            $grades['egoing'] = 10;
            $grades['k8805'] = 6;
            $grades['sorialgi'] = 80;
            var_dump($grades);
        ?>
    </body>
</html>

배열의 키로 값 가져오기

<html>
    <body>
        <?php
        $grades = array('egoing'=>10, 'k8805'=>6, 'sorialgi'=>80);
        echo $grades['sorialgi'];
        ?>
    </body>
</html>