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@ 2018-01-25T12:27:50Z

<?php

$filteredZips='[
    {
        "id": 21,
        "distance": "0"
    },
    {
        "id": 20,
        "distance": "3.9399923305414037"
    },
    {
        "id": 29,
        "distance": "8.33045537474091"
    }   
]';

$filteredZips = json_decode($filteredZips);

$results = array();
foreach ($filteredZips as $zip) {
    $results[] = $zip->id;
}

print_r($results);

Output
Performance
VLD
References
Branches

json_decode: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

36.85 ms | 405 KiB | 5 Q