按键值搜索数组元素

Question

我有以下 PHP 代码，它通过键名搜索数组，returns 结果等于搜索。出于好奇，我该怎么做，无论我搜索什么，结果都是名称键值等于 "A" 的元素？很快我怎样才能检索名称为 "A" 的元素？

我尝试了以下但不起作用：

$jSearchResult[] = $ajProducts[$i]->name = "A";

请帮助我，因为我只是想不出如何通过键值检索数组的元素，但我确信它一定非常简单。

<?php

//DATA coming from the BROWSER
$sSearch = $_GET['search'];
//TURN it into UPPERCASE
strtoupper( $sSearch );

//GETTING from the TEXT FILE:
$sajProducts = file_get_contents( 'products.txt' );
$ajProducts = json_decode( $sajProducts );

$match_found = false;
//Collect all matching result in an array 
$jSearchResult = array();
//LOOPING THROUGH THE ARRAY OF PRODUCTS
for ( $i=0; $i< count( $ajProducts ); $i++ ) {

    if ( $sSearch == $ajProducts[$i]->name ) {
         $jSearchResult[] = $ajProducts[$i]->name;
         $match_found = true;    
    }
}
//if there is a match display the product
if ( $match_found ) {
    echo json_encode ( $jSearchResult );
    exit;
}
//if not display ALL products
else { 

     echo json_encode ( $ajProducts );
     exit;
}

?>

$ajProducts 看起来像这样：

[
    {
        "id": "59d278cae7017",
        "name": "A",
        "price": "1",
        "quantity": 2,
        "image": "img_webshop\/productimage-59d74304917c2.jpg"
    },
    {
        "id": "59d27e20c8028",
        "name": "A",
        "price": "2",
        "quantity": 1,
        "image": "img_webshop\/productimage-59d743233c0cf.jpg"
    },
    {
        "id": "59d6a7ae16d15",
        "name": "A",
        "price": "3",
        "quantity": 2,
        "image": "img_webshop\/productimage-59d743392fbb5.jpg"
    },
    {
        "id": "59d6d6ee5f752",
        "name": "A",
        "price": "4",
        "quantity": 1,
        "image": "img_webshop\/productimage-59d74352d5b94.jpg"
    },
    {
        "id": "59d743d207bd5",
        "name": "B",
        "price": "5",
        "quantity": 1,
        "image": "img_webshop\/productimage-59d743d1e6e64.jpg"
    },
    {
        "id": "59d74451225ac",
        "name": "B",
        "price": "6",
        "quantity": 0,
        "image": "img_webshop\/productimage-59d7445120871.jpg"
    },
    {
        "id": "59e0d992d1f3b",
        "name": "C",
        "price": "6",
        "quantity": 2,
        "image": "img_webshop\/productimage-59e725ac79583.jpg"
    }
]

Answer 1

如果你想要 match 个 name key 值等于 "A" 的元素，那么你只需创建一个 check name key 的值等于 "A" 喜欢 -

foreach ($ajProducts as $ajProduct ) {

   if ( "A" == $ajProduct->name ) {
     $jSearchResult[] = $ajProduct->name;
     $match_found = true;    
   }
}

Answer 2

有一个 php 函数可以做到这一点：http://php.net/array_filter

$searchResult = array_filter($ajProducts, function ($product) {
    return $product->name === 'A';
});

这将为您提供 $ajProducts 中 name 属性设置为 'A' 的所有对象。

查看是否有任何结果：

$matchFound = !empty($searchResult);

按键值搜索数组元素

Search elements of an array by key value

php

keyvaluepair