- print_r: documentation ( source)
- json_encode: documentation ( source)
<?php
$keyword = "täglich";
$json = array("context" => array(array("paragraph" => array(array("sentence" => array($keyword))) )) );
$json = json_encode($json);
$query = '{ "context": [ { "paragraph": [ { "sentence": [ '.$keyword.' ] } ] } ] }';
print_r($json);