Json Examples

Json with PHP:

This chapter covers how to encode and decode JSON objects using PHP programming language. Let’s start with preparing the environment to start our programming with PHP for JSON.

Environment:

As of PHP 5.2.0, the JSON extension is bundled and compiled into PHP by default.

–  JSON Functions:

Function Libraries
json_encode Returns the JSON representation of a value.
json_decode Decodes a JSON string.
json_last_error Returns the last error occurred.

–  Encoding JSON in PHP (json_encode):

PHP json_encode() function is used for encoding JSON in PHP. This function returns the JSON representation of a value on success or FALSE on failure.

–  Syntax:

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

–   Parameters

  • value− The value being encoded. This function only works with UTF-8 encoded data.
  • options− This optional value is a bitmask consisting of JSON_HEX_QUOT,        JSON_HEX_TAG,                       JSON_HEX_AMP,                   JSON_HEX_APOS, JSON_NUMERIC_CHECK,                                                         JSON_PRETTY_PRINT,  JSON_UNESCAPED_SLASHES,  JSON_FORCE_OBJECT.

    Example:

    The following example shows how to convert an array into JSON with PHP −

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

    While executing, this will produce the following result −

    {“a”:1,”b”:2,”c”:3,”d”:4,”e”:5} 

    The following example shows how the PHP objects can be converted into JSON –

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

    While executing, this will produce the following result −

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

    –  Decoding JSON in PHP (json_decode):

    PHP json_decode() function is used for decoding JSON in PHP. This function returns the value decoded from json to appropriate PHP type.

    –  Syntax

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

    –   Paramaters:

    • json_string− It is an encoded string which must be UTF-8 encoded data.
    • assoc− It is a boolean type parameter, when set to TRUE, returned objects will be converted into associative arrays.
    • depth− It is an integer type parameter which specifies recursion depth
    • options− It is an integer type bitmask of JSON decode, JSON_BIGINT_AS_STRING is supported.

      –  Example

      The following example shows how PHP can be used to decode JSON objects –

      <?php 
      
              $json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';                  
      
             var_dump(json_decode($json));                                    var_dump(json_decode($json, true));
      
      ?>

      While executing, it will produce the following result –

      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)
      
      }

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