初めてのPHP

4.2

 配列のループ

65

特定の値を持つ要素を調べるには、例4-16 に示すように

in_array()

を使います。

例

4-16

 特定の値を持つ要素の調査

$meals = array('Walnut Bun' => 1,

'Cashew Nuts and White Mushrooms' => 4.95,

'Dried Mulberries' => 3.00,

'Eggplant with Chili Sauce' => 6.50,

'Shrimp Puffs' => 0);

$books = array("The Eater's Guide to Chinese Characters",

'How to Cook and Eat in Chinese');

//

これは

true

：キー

Dried Mulberries

の値は

3.00

if (in_array(3, $meals)) {

print 'There is a $3 item.';

}

//

これは

true

if (in_array('How to Cook and Eat in Chinese', $books)) {

print "We have How to Cook and Eat in Chinese";

}

//

これは

false

：

in_array()

は大文字小文字を区別する

if (in_array("the eater's guide to chinese characters", $books)) {

print "We have ...