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.
Syntax :

string json_encode( $value, $option, $depth )

Parameters:

• $value: It is a mandatory parameter which defines the value to be encoded.
• $option: It is optional parameter which defines the Bitmask consisting of JSON_FORCE_OBJECT, JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_INVALID_UTF8_IGNORE, JSON_INVALID_UTF8_SUBSTITUTE, JSON_NUMERIC_CHECK, JSON_PARTIAL_OUTPUT_ON_ERROR, JSON_PRESERVE_ZERO_FRACTION, JSON_PRETTY_PRINT, JSON_UNESCAPED_LINE_TERMINATORS, JSON_UNESCAPED_SLASHES, JSON_UNESCAPED_UNICODE, JSON_THROW_ON_ERROR.
• $depth: It is optional parameter which sets the maximum depth. Its value must be greater than zero.

Return Value: This function returns a JSON representation on success or false on failure.

Example 1: This example encodes PHP array into JSON representation.

<?php

// Declare an array
$value = array(
    "name"=>"GFG",
    "email"=>"abc@gfg.com");

// Use json_encode() function
$json = json_encode($value);

// Display the output
echo($json);

?>

Output:

{"name":"GFG","email":"abc@gfg.com"}

Example 2: This example encodes PHP multidimensional array into JSON representation.

<?php

// Declare multi-dimensional array
$value = array(
    "name"=>"GFG",
    array(
        "email"=>"abc@gfg.com",
        "mobile"=>"XXXXXXXXXX"
    )
);

// Use json_encode() function
$json = json_encode($value);

// Display the output
echo($json);

?>

Output:

{"name":"GFG","0":{"email":"abc@gfg.com","mobile":"XXXXXXXXXX"}}

Example 3: This example encodes PHP objects into JSON representation.

<?php

// Declare class
class GFG {

}

// Declare an object
$value = new GFG();

// Set the object elements
$value->organisation = "GeeksforGeeks";
$value->email = "feedback@geeksforgeeks.org";

// Use json_encode() function
$json = json_encode($value);

// Display the output
echo($json);

?>

Output:

{"organisation":"GeeksforGeeks","email":"feedback@geeksforgeeks.org"}

Reference: https://www.php.net/manual/en/function.json-encode.php