How to convert php array to json

How to convert a php array into json: first create a PHP sample file; then define an array; finally, use the "json_encode($arr);" method to convert the array into json format data.

The operating environment of this tutorial: Windows 7 system, PHP version 5.6. This method is suitable for all brands of computers.

Recommended: "PHP Video Tutorial"

How to convert php array into json:

Convert PHP Convert the array to JSON format data

<?php
   $arr = array(&#39;a&#39; => 1, &#39;b&#39; => 2, &#39;c&#39; => 3, &#39;d&#39; => 4, &#39;e&#39; => 5);
   echo json_encode($arr);
?>

The execution result of the above code is:

{"a":1,"b":2,"c":3,"d":4,"e":5}

JSON function

Function	Description
json_encode	JSON encoding for variables
json_decode	JSON format Decode the string and convert it into a PHP variable
json_last_error	Return the last error that occurred

json_encode

PHP json_encode() is used to JSON encode variables. This function returns JSON data if executed successfully, otherwise it returns FALSE.

Syntax

string json_encode ( $value [, $options = 0 ] )

Parameters

• value: The value to be encoded. This function is only valid for UTF-8 encoded data.
• options: Binary mask composed of the following constants: JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT

The following example demonstrates Learn how to convert PHP objects into JSON format data:

<?php
   class Emp {
       public $name = "";
       public $hobbies  = "";
       public $birthdate = "";
   }
   $e = new Emp();
   $e->name = "sachin";
   $e->hobbies  = "sports";
   $e->birthdate = date(&#39;m/d/Y h:i:s a&#39;, "8/5/1974 12:20:03 p");
   $e->birthdate = date(&#39;m/d/Y h:i:s a&#39;, strtotime("8/5/1974 12:20:03"));

   echo json_encode($e);
?>

The execution result of the above code is:

{"name":"sachin","hobbies":"sports","birthdate":"08\/05\/1974 12:20:03 pm"}

json_decode

PHP json_decode() function is used to decode characters in JSON format The string is decoded and converted into a PHP variable.

Syntax

mixed json_decode ($json_string [,$assoc = false [, $depth = 512 [, $options = 0 ]]])

Parameters

• json_string: The JSON string to be decoded must be UTF-8 encoded data

• assoc: When this parameter is TRUE, an array will be returned, and when FALSE, an object will be returned.

• depth: A parameter of type integer that specifies the recursion depth

• options: Binary Mask, currently only JSON_BIGINT_AS_STRING is supported.

Example

The following example demonstrates how to decode JSON data:

The execution result of the above code is:

object(stdClass)#1 (5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}

array(5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}

This method is applicable to all brands of computers.

The above is the detailed content of How to convert php array to json. For more information, please follow other related articles on the PHP Chinese website!