<?php
$scores = [
‘first’ => 90,
‘second’ => 40,
‘third’ => 100,
];
// foreach ($scores as $value) {
// foreach ($scores as $score) {
// echo $score . PHP_EOL;
// }
foreach ($scores as $key => $score) {
echo $key . ‘ – ‘ . $score . PHP_EOL;
}
カテゴリー: プログラミング
PHP 配列
<?php
$scores = [
‘first’ => 90,
‘second’ => 40,
‘third’ => 100,
];
// var_dump($scores);
// print_r($scores);
echo $scores[‘third’] . PHP_EOL;
PHP 配列
<?php
// $score1 = 90;
// $socre2 = 40;
// $score3 = 100;
$scores = [
90,
40,
100,
];
$scores[1] = 60;
echo $scores[1] . PHP_EOL;
PHP null
~ $ php main.php
Gold Medal
Fatal error: Uncaught TypeError: Return value of getAward() must be of the type string, null returned in /home/dotinstall/main.php:7
Stack trace:
#0 /home/dotinstall/main.php(11): getAward(40)
#1 {main}
thrown in /home/dotinstall/main.php on line 7
~ $ php main.php
Gold Medal
~ $ php main.php
Gold Medal
~ $
<?php
declare(strict_types=1);
function getAward(?int $score): ?string
{
return $score >= 100 ? ‘Gold Medal’ : null;
}
echo getAward(150) .PHP_EOL;
echo getAward(40) .PHP_EOL;
PHP 引数の型
<?php
declare(strict_types=1);
function showInfo(string $name, int $score): void
{
echo $name . ‘: ‘ . $score . PHP_EOL;
}
// showInfo(‘taguchi’, 40);
// showInfo(‘taguchi’, ‘dotinstall’);
showInfo(‘taguchi’, ‘4’);
PHP 条件演算子
<?php
function sum($a, $b, $c)
{
$total = $a + $b + $c;
// if($total < 0){
// return 0;
// }else{
// return $total;
// }
return $total < 0 ? 0 : $total;
}
echo sum(100, 300, 500) .PHP_EOL; //900
echo sum(-1000, 300, 500) .PHP_EOL; //0
PHP 無名関数
<?php
// function sum($a, $b, $c)
// {
// return $a + $b + $c;
// }
$sum = function ($a, $b, $c){ //無名関数
return $a + $b + $c;
};
echo $sum(100, 300, 500) .PHP_EOL;
PHP スコープ
<?php
$rate = 1.1; //グローバルスコープ
function sum($a, $b, $c)
{
// global $rate;
$rate = 1.08; //ローカルスコープ
return ($a + $b + $c) * $rate;
}
echo sum(100, 200, 300) + sum(300, 400, 500) . PHP_EOL; //1944
PHP return
<?php
function sum($a, $b, $c)
{
// echo $a + $b + $c . PHP_EOL;
return $a + $b + $c;
echo ‘Here!’ .PHP_EOL;
}
sum(100, 200, 300);//600
sum(300, 400, 500);//1200
echo sum(100, 200, 300) + sum(300, 400, 500) .PHP_EOL;//1800
PHP 引数
<?php
function showAd($message = ‘Ad’) //仮引数
{
echo ‘———-‘ . PHP_EOL;
echo ‘— ‘ . $message . ‘ —‘ . PHP_EOL;
echo ‘———-‘ . PHP_EOL;
}
showAd(‘Header Ad’); //実引数
echo ‘Tom is great!’ . PHP_EOL;
echo ‘Bob is great!’ . PHP_EOL;
// showAd(‘Ad’);
showAd();
echo ‘Steve is great!’ . PHP_EOL;
echo ‘Bob is great!’ . PHP_EOL;
showAd(‘Footer Ad’);