php json：encode在服务器上的角度控制器上的http调用上返回未定义，但在本地主机上运行良好

Question

php json:encode returning undefined on http call on angular controller on server but works well on the localhost.

if( hash_equals($hashed_password, crypt($password, $hashed_password))){
    $pass = "true";
    $result = array('pass' => $pass, 'FirstName' => $f_name,
    'LastName'  => $l_name,'id' => $id);
}else{
    $pass = False;
    $result = array('pass' => $pass, 'FirstName' => "", 'LastName' => ""
 , 'id' => $id);    
}
$json_response = json_encode($result);
echo $json_response;

Answer 1

For ajax calls, such as this requires the header to be set as application/json, so javascript can easily read it, and also need to make error reporting to false in ajax related API designs

<?php
error_reporting(0);
...
...
...
header('Content-Type:application/json;');
echo $json_response;

this output is easily readable by javascript