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json_encode() - PHP to JSON Data Type Mapping
How data types are mapped from the PHP variable to the JSON text string when calling the json_encode() function?
✍: FYIcenter.com
Data types are mapped from the PHP variable to the JSON text string
based on the following table, when calling the json_encode() function:
PHP Data Type > JSON Data Type ------------- > ------------- null > null Boolean > Boolean Int or Float > Number String > String Array > Array Object > Object Associative Array > Object
Here is a PHP example that shows you how json_encode() maps PHP data types to JSON data types:
<?php # json_encode_datatype.php # Copyright (c) FYIcenter.com $var = null; print("\nInput: "); var_dump($var); print("Output: ".json_encode($var)."\n"); $var = true; print("\nInput: "); var_dump($var); print("Output: ".json_encode($var)."\n"); $var = 20.20; print("\nInput: "); var_dump($var); print("Output: ".json_encode($var)."\n"); $var = 2020; print("\nInput: "); var_dump($var); print("Output: ".json_encode($var)."\n"); $var = "2020"; print("\nInput: "); var_dump($var); print("Output: ".json_encode($var)."\n"); $var = array("a","b","c"); print("\nInput: "); var_dump($var); print("Output: ".json_encode($var)."\n"); $var = new stdClass(); $var->a = "1"; $var->b = "2"; $var->c = "3"; print("\nInput: "); var_dump($var); print("Output: ".json_encode($var)."\n"); ?>
If you run the above PHP code through the PHP engine, you get the following output:
>\fyicenter\php\php.exe json_encode_datatype.php Input: NULL Output: null Input: bool(true) Output: true Input: float(20.2) Output: 20.2 Input: int(2020) Output: 2020 Input: string(4) "2020" Output: "2020" Input: array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" } Output: ["a","b","c"] Input: object(stdClass)#1 (3) { ["a"]=> string(1) "1" ["b"]=> string(1) "2" ["c"]=> string(1) "3" } Output: {"a":"1","b":"2","c":"3"}
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2017-08-16, 955👍, 0💬
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