Delete from json using php

$json_obj = json_decode($json_string);
$unset_queue = array();

foreach ( $json_obj->Results as $i => $item )
{
    if ($item->username == "google")
    {
        $unset_queue[] = $i;
    }
}

foreach ( $unset_queue as $index )
{
    unset($json_obj->Results[$index]);
}

// rebase the array
$json_obj->Results = array_values($json_obj->Results);

$new_json_string = json_encode($json_obj);

<?php

  $JSON = '{"Results":['
          . '{"username":"test","password":"test"},'
          . '{"username":"test","password":"test"},'
          . '{"username":"google","password":"test"},'
          . '{"username":"yahoo","password":"test"},'
          . '{"username":"hotmail","password":"test"}'
        . ']}';

  // use json_decode to parse the JSON data in to a PHP object
  $jsonInPHP = json_decode($JSON);

  // now iterate over the results and remove the one that's google
  $results = count($jsonInPHP->Results);
  for ($r = 0; $r < $results; $r++){

    // look for the entry we are trying to find
    if ($jsonInPHP->Results[$r]->username == 'google'
     && $jsonInPHP->Results[$r]->password == 'test'){

      // remove the match
      unset($jsonInPHP->Results[$r]);

      // now we can either break out of the loop (only remove first match)
      // or you can use subtract one from $r ($r--;) and keep going and
      // find all possible matches--your decision.
      break;
    }
  }

  // now that we removed items the keys will be off. let's re-order the keys
  // so they're back in-line
  $jsonInPHP->Results = array_values($jsonInPHP->Results);

  // dump the new JSON data, less google's entry
  echo json_encode($jsonInPHP);

Would be how I approach it. I like to avoid foreach(...){} statements when I need to modify the array itself. The above code, by the way, leaves you with:

{
  "Results":[
    {"username":"test","password":"test"},
    {"username":"test","password":"test"},
    {"username":"yahoo","password":"test"},
    {"username":"hotmail","password":"test"}
  ]
}

$json = '
{
  "Results":[
    {"username":"test","password":"test"},
    {"username":"test","password":"test"},
    {"username":"google","password":"test"},
    {"username":"yahoo","password":"test"},
    {"username":"hotmail","password":"test"}
  ]
}';

$arr = json_decode($json, true);
array_filter($arr, function($v) {
  return !($v['username'] == 'google' && $v['password'] == 'test');
});
$json = json_encode($arr);

$input='{"Results":[{"username":"test","password":"test"},{"username":"test","password":"test"},{"username":"google","password":"test"},{"username":"yahoo","password":"test"},{"username":"hotmail","password":"test"}]}';

$json = json_decode($input,true);
$match = array('username'=>'google', 'password'=>'test');
unset($json['Results'][array_search($match,$json['Results'])]);

To do it without a foreach but assuming you know the exact values you want to remove

Old question, formatting your JSON differently would help a lot. Each result entry should have a unique key to identify it. This makes it easy when needing to remove or update that result. No reason to iterate over entire JSON this way.

Code would look like this

<?php 
 $jsonString = '{"Results":{'
          .'{"username1":{"username":"google","password":"test1"}}'
          .'{"username2":{"username":"yahoo","password":"test2"}}'
          .'{"username3":{"username":"msonline","password":"test3"}}'
          . '}}';
$jsonInPHP = json_decode($jsonString);

$password = $jsonInPHP["username1"]["pasword"];//Returns test1
$username = $jsonInPHP["username1"]["username"];//Returns google

?>

$myArray=json_decode($theJSONstring);
unset($myArray['Results'][2]);