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When the array is empty ( ), a JSON array would be created when it’s not empty ( ), an object would be emitted instead. This handles the case where a variable contains an associative array which might be empty. JSON_FORCE_OBJECT – Convert PHP numerical arrays to JSON objects instead of arrays.Many more flags are supported when encoding data. Take care around the order though – in a quirk of the PHP standard library, the position of these two optional parameters is switched compared to json_decode(). Like its decoding counterpart, json_encode() accepts $flags and $depth parameters. PHP scalar types map directly into JSON with no transformation. PHP objects and associative arrays will become JSON objects containing all the enumerable property/key-value pairs of the input value.
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Data types are automatically handled to ensure they have an appropriate mapping in the generated JSON. PHP accepts any value as $value, except for resources. You’ve no way of knowing whether the null return value is due to the JSON containing null, or because the JSON was malformed and couldn’t be parsed. This presents an issue because an isolated null is a valid JSON string. Handling Parsing Errorsīy default, json_decode() will return null when it’s passed an invalid JSON string.
Php json decode depth manual#
These are described in detail within the PHP manual and allow you to define how specific data types should be handled. The $flags parameter accepts a bitmask of optional flags that alter the parsing behaviour.
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You’ll get null if the JSON nests deeper than the set level – no attempt will be made to parse the data. The $depth parameter lets you control the maximum nesting level to parse down to. If you’d rather receive an associative array, pass true to the $associative parameter of json_decode(). Our new object will have a property foo with the value of bar. We’ll work with which decodes to an instance of PHP’s generic stdClass. The simplest invocation is to pass a JSON string with no other arguments.