php中函数的类型提示和文件读取功能

发布时间：2020-12-13 17:31:58 所属栏目：PHP教程来源：网络整理

导读：这个没有深入。 ? php function addNumbers(int $a ,int $b ,bool $printSum ): int { $sum = $a + $b ; if ( $printSum ) { echo ‘The sum is ‘ . $sum . ‘br/‘ ; } return $sum ; } addNumbers( 1,2, true ); echo "br/" ; addNumbers( 10,34, true );

这个没有深入。

<?php

    function addNumbers(int $a,int $b,bool $printSum): int {
        $sum = $a + $b;
        if ($printSum) {
            echo ‘The sum is ‘ . $sum. ‘<br/>‘;
        }
        return $sum;
    }

    addNumbers(1,2,true);
    echo "<br/>";
    addNumbers(10,34,true);
    echo "<br/>";
    addNumbers(1,46,true);

    $bookJson = file_get_contents(‘books.json‘);
    $books = json_decode($bookJson,true);
    foreach ($books as $key => $book) {
        foreach ($book as $bookKey => $bookItem) {
            echo $key . ‘. ‘ . $bookKey . ‘->‘ . $bookItem . ‘<br/>‘;
        }
        
    }
?>

books.json

[
    {
        "title": "To Kill A Mockingbird","author": "Harper Lee","available": true,"pages": 336,"isbn": 9780061120084
    },
    {
        "title": "1984","author": "George Orwell","pages": 267,"isbn": 9780547249643
    },
    {
        "title": "One Hundred Years Of Solitude","author": "Gabriel Garcia Marquez","available": false,"pages": 457,"isbn": 9785267006323
    }
]

输出：

The sum is 3

The sum is 44

The sum is 47
0. title->To Kill A Mockingbird
0. author->Harper Lee
0. available->1
0. pages->336
0. isbn->9780061120084
1. title->1984
1. author->George Orwell
1. available->1
1. pages->267
1. isbn->9780547249643
2. title->One Hundred Years Of Solitude
2. author->Gabriel Garcia Marquez
2. available->
2. pages->457
2. isbn->9785267006323

（编辑：李大同）

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