Search elements of an array by key value - php

Question

I have the following PHP code which searches the array by the key name and returns result equals to the search. Just for curiosity how can I do that, that no matter what I search for the result will be elements where the name key value equals "A"? Shortly how can I retrieve elements where name is "A" ?
I tried the following but does´t work:
$jSearchResult[] = $ajProducts[$i]->name = "A";
Please help me cause I just simply can´t figure out how to retrive elements of an array by key value, however I am sure it must be something very simple.
<?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 looks like this:
[
{
"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

There is a php function that does just that: http://php.net/array_filter
$searchResult = array_filter($ajProducts, function ($product) {
return $product->name === 'A';
});
This will get you all objects in $ajProducts having name property set to 'A'.
To see if there're any results:
$matchFound = !empty($searchResult);

Answer 2

If you want to match elements where the name key value equals "A", then you can just make a check with value of name key is equal to "A" like -
foreach ($ajProducts as $ajProduct ) {
if ( "A" == $ajProduct->name ) {
$jSearchResult[] = $ajProduct->name;
$match_found = true;
}
}