Json_decode返回字符串（0）“”

I am trying to pass data from ios to server.

Php code :

<?php
   $inputJSON = file_get_contents('php://input');
   $data = json_decode($inputJSON, TRUE);
   var_dump($data);
?>

This gives me string(0) "". I don't know whats the meaning of this.

        echo $inputJSON; gives nothing 
       var_dump($inputJSON); returns  string(0) ""

When i print the json-string it gives me a valid string

Please find the full codes of this problem in another question of mine

Cannot able to access json array in php , it returns null and Warning: Invalid argument supplied for foreach()

With God Grace solved my problem-

pass true to convert objects to associative arrays, so accessing numeric/associative array like this.

$var = $data[0]['key'];

Then we use a combination of numeric and associative array syntax to access the desired element in multidimensional array.

But if i trying to var_dump($data); is retun null.

Reference tutorial: http://www.dyn-web.com/tutorials/php-js/json/decode.php

fisrt you should check is your url is correct or not. If every thing is right but still its not showing the response use curl functionality such as alter native of file_get_content

I have created an example for you that what i am talking:-

1.My both file (php code file and json string file) in the same working directory.Check:- http://prntscr.com/apkbp9

2.json string file content should be:-

[
    {
        "email" : "",
        "Name" : "Ddd",
        "contact2" : "",
        "ontact1" : ""
    },
    {
        "email" : "",
        "Name" : "Ddd",
        "contact2" : "",
        "contact1" : ""
    },
    {
        "email" : "",
        "Name" : "Dddddr",
        "contact2" : "",
        "contact1" : ""
    }
]

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3.php code file content:-

<?php
   $inputJSON = file_get_contents('input.txt');
   echo $inputJSON;
   $data = json_decode($inputJSON, TRUE);
   echo "<pre/>";print_r($data);
?>

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Output on my browser:- http://prntscr.com/apkcoi

You can use CURL like below:-

<?php
   function url_get_contents ($Url) {
        if (!function_exists('curl_init')){ 
            die('CURL is not installed!');
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $Url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $output = curl_exec($ch);
        curl_close($ch);
        return $output;
    }
    $inputJSON = url_get_contents('php://input');
    echo $inputJSON;
    $data = json_decode($inputJSON, TRUE);
    echo "<pre/>";print_r($data);

?>

For more reference about CURL :- http://php.net/manual/en/book.curl.php

Note:- if both will not work, then first you need to save your json data in a file with extension .txt and then you can use both code given above, just by putting the full path of that text file.