2. 타입

NULL

$null_val = NULL;
var_dump(is_null($null_val));

BOOLEAN

$bool_val = TRUE;
echo get_debug_type($bool_val). PHP_EOL;
var_dump($bool_val);

INTEGER

$int_val = 1234;
echo get_debug_type($int_val). PHP_EOL;
var_dump($int_val);

FLOAT

$float_val = 1.234;
echo get_debug_type($float_val). PHP_EOL;
var_dump($float_val);

STRING

$str_val = "apple";
echo get_debug_type($str_val). PHP_EOL;
var_dump($str_val);
echo 'He drank some $str_val juice. \n apple' . PHP_EOL;
echo "He drank some $str_val juice. \n apple" . PHP_EOL;

var_dump("0" == 0);     //ok
var_dump("001" == 1);   //ok

위와같은 특수한 경우 문자열은 숫자와 비교가능하다

ARRAY

$array_val1 = array(1,2,3);
var_dump($array_val1);

$array_val2 = array(
    "foo" => "bar",
    1 => "foo",
    "multi" => array(
        "dimensional" => array(
            "array" => "foo"
        )
    )
);
var_dump($array_val2);

foreach ($array_val1 as $array_val1_item) {
    echo "Do you like $array_val1_item?\n";
}

$array_val3 = serialize($array_val1);
var_dump($array_val3);

$array_val4 = unserialize("a:3:{i:0;i:1;i:1;i:2;i:2;i:3;}");
var_dump($array_val4);

PHP의 배열은 MAP의 성격을 같이 띈다

 

형변환

<?php
$foo = 10;   // $foo is an integer
$bar = (bool) $foo;   // $bar is a boolean
?>