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How Do I Convert a PHP Array to a JSON Array Using `json_encode`?
How Do I Convert a PHP Array to a JSON Array Using `json_encode`?
Dec 03, 2024 pm 01:12 PM
Converting PHP Array to JSON Array Using json_encode
When working with PHP arrays, it's important to understand how they are represented in JSON when using json_encode. By default, PHP arrays are encoded as JSON objects when their keys are not sequential.
Consider the following PHP array:
$input = [
[
"id" => 0,
"name" => "name1",
"short_name" => "n1"
],
[
"id" => 2,
"name" => "name2",
"short_name" => "n2"
]
];
When attempting to encode this array using json_encode, the result would be the following JSON object:
{
"0": {
"id": 0,
"name": "name1",
"short_name": "n1"
},
"2": {
"id": 2,
"name": "name2",
"short_name": "n2"
}
}
This behavior occurs because the array keys are non-sequential (0 and 2). To encode the array as a JSON array, all keys must be sequential.
Solution: Reindexing with array_values
To convert the array to a sequential format, use the array_values function:
$output = json_encode(array_values($input));
This reindexes the array, starting with 0, ensuring sequential keys. The resulting JSON becomes an array:
[
{
"id": 0,
"name": "name1",
"short_name": "n1"
},
{
"id": 2,
"name": "name2",
"short_name": "n2"
}
]
By understanding PHP array representation in JSON and using array_values for sequential reindexing, you can successfully encode PHP arrays as JSON arrays using json_encode.
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