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PHP | json_encode() Function The json_encode() function is an inbuilt function in PHP which is used to convert PHP array or object into JSON representation.
json_encode() is a native PHP function that allows you to convert PHP data into the JSON format. The function takes in a PHP object ($value) and returns a JSON string (or False if the operation fails).
You convert the whole array to JSON as one object by calling JSON. stringify() on the array, which results in a single JSON string. To convert back to an array from JSON, you'd call JSON. parse() on the string, leaving you with the original array.
PHP json_decode() and json_encode(): Summary JSON can be handled by using inbuilt PHP functions. For example, a PHP object might be turned into JSON format file using PHP json_encode() function. For the opposite transformation, use PHP json_decode() . PHP arrays are not supported by XML but can be converted into JSON.
See Arrays in RFC 8259 The JavaScript Object Notation (JSON) Data Interchange Format:
An array structure is represented as square brackets surrounding zero or more values (or elements). Elements are separated by commas.
array = begin-array [ value *( value-separator value ) ] end-array
You are observing this behaviour because your array is not sequential - it has keys 0 and 2, but doesn't have 1 as a key.
Just having numeric indexes isn't enough. json_encode will only encode your PHP array as a JSON array if your PHP array is sequential - that is, if its keys are 0, 1, 2, 3, ...
You can reindex your array sequentially using the array_values function to get the behaviour you want. For example, the code below works successfully in your use case:
echo json_encode(array_values($input)).
Array in JSON are indexed array only, so the structure you're trying to get is not valid Json/Javascript.
PHP Associatives array are objects in JSON, so unless you don't need the index, you can't do such conversions.
If you want to get such structure you can do:
$indexedOnly = array();
foreach ($associative as $row) {
$indexedOnly[] = array_values($row);
}
json_encode($indexedOnly);
Will returns something like:
[
[0, "name1", "n1"],
[1, "name2", "n2"],
]
json_decode($jsondata, true);
true turns all properties to array (sequential or not)
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