How to convert data into json format in php

In PHP, you can use the json_encode() function to convert data into json format. This function can JSON encode PHP variables and return JSON format data. The syntax is "json_encode($value[,$options]) ”; if the conversion fails, FALSE will be returned.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, you can use the json_encode() function Convert data to json format.

The json_encode() function can JSON encode PHP variables and return JSON format data; if the conversion fails, FALSE will be returned.

This function accepts one required parameter and one optional parameter:

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 consisting 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

## Description:

• # Returns the string type, which contains the representation of value in JSON form.

• The encoding is affected by the options parameter passed in. In addition, the encoding of floating point values ​​depends on serialize_precision.

Example 1: Convert array to json format

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr = array (&#39;a&#39;=>1,&#39;b&#39;=>2,&#39;c&#39;=>3,&#39;d&#39;=>4,&#39;e&#39;=>5);
echo json_encode($arr);
var_dump(json_encode($arr));
?>

Example 2: Convert array to json format Convert PHP object to JSON format data

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

Example 3: Usage of options parameter in json_encode() function

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$a = array(&#39;<foo>&#39;,"&#39;bar&#39;",&#39;"baz"&#39;,&#39;&blong&&#39;, "\xc3\xa9");

echo "Normal: ",  json_encode($a), "<br>";
echo "Tags: ",    json_encode($a, JSON_HEX_TAG), "<br>";
echo "Apos: ",    json_encode($a, JSON_HEX_APOS), "<br>";
echo "Quot: ",    json_encode($a, JSON_HEX_QUOT), "<br>";
echo "Amp: ",     json_encode($a, JSON_HEX_AMP), "<br>";
echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "<br>";
echo "All: ",     json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "<br><br>";

$b = array();

echo "Empty array output as array: ", json_encode($b), "<br>";
echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "<br><br>";

$c = array(array(1,2,3));

echo "Non-associative array output as array: ", json_encode($c), "<br>";
echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "<br><br>";

$d = array(&#39;foo&#39; => &#39;bar&#39;, &#39;baz&#39; => &#39;long&#39;);

echo "Associative array always output as object: ", json_encode($d), "<br>";
echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "<br><br>";
?>

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