打印符合条件的行中的一个值，或者打印特定列中的所有值

Question

I am using a foreach loop to echo names from my multi-dimensional array.

Sample Array:

$readJson = [
    [
        'id' => 78,
        'name' => 'audi',
        'sscat_id' => 59,
        'date' => '0000-00-00 00:00:00'
    ],
    [
        'id' => 106,
        'name' => 'apache',
        'sscat_id' => 86,
        'date' => '0000-00-00 00:00:00'
    ],
    [
        'id' => 16,
        'name' => 'asia',
        'sscat_id' => 62,
        'date' => '0000-00-00 00:00:00'
    ]
];

I need to implement a condition whereby if the value of $_GET['b'] exists in the id column of my array, I want to echo that subarray's name value.

If $_GET['b'] does not exist in my array, I want to echo all of the name values in the array.

The is my failing code:

foreach ($readJson as $key => $value){
    if($_GET["b"] === $value["id"]){ // here is statement
        echo $value["name"]; // I want to echo just this item not others
        // maybe break; ?
    } else {
        echo $value["name"]; // echo all items
    }
}

I guess I need something like break but I know break won't echo items after it.

Or if I get item index maybe I could echo it by index or id?

Answer 1

Code: ( Demo )

$readJson=[
    ['id'=>78,'name'=>'audi','sscat_id'=>59,'date'=>'0000-00-00 00:00:00'],
    ['id'=>106,'name'=>'apache','sscat_id'=>86,'date'=>'0000-00-00 00:00:00'],
    ['id'=>16,'name'=>'asia','sscat_id'=>62,'date'=>'0000-00-00 00:00:00']
];

$_GET['b']=16;  // test case for echoing one
//$_GET['b']=99;  // test case for echoing all

if(($index=array_search($_GET["b"],array_column($readJson,'id')))!==false){  // id exists in multi-dim array
    echo $readJson[$index]['name'];
}else{  // id not found, show all
    echo implode(', ',array_column($readJson,'name'));
}

Output:

asia

When $_GET['b']=99 , then output is:

audi, apache, asia

Answer 2

Filter the values by matches, if none matched, use all values instead, and output them:

$values = array_filter($readJson, function ($i) { return $i['id'] == $_GET['b']; });

foreach ($values ?: $readJson as $value) {
    echo $value['name'];
}

If $values is empty ( == false ), $values ?: $readJson falls back to $readJson , otherwise uses $values .

Alternatives might include echo join(', ', array_column($values ?: $readJson, 'name')) ; depending on what exactly you need to do with those values in the loop.

Answer 3

    if(array_search($_GET["b"],array_column($readJson, 'id')) !== False)  {
       foreach ($readJson as $key => $value){
         if($_GET["b"]==$value["id"]){
              echo $value["name"];
          }         
       }     
    }else{
      foreach ($readJson as $key => $value){
          echo $value["name"];
       }
    }

Answer 4

We want to first set as an array of all the values and then check using array_search after that print that value using the key of that searched value. if the get value is empty means print all the array values.

Check with like this i added sample array and printed:

$readJson = array(1,2,3,4,5);
        $arr = array();
       foreach ($readJson as $key => $value){   
        $arr[] = $value;
        }
        if($key = array_search($_GET["b"], $arr)){
            echo $arr[$key];
        }else{
            print_r($arr);
        }