Javascript in PHP file which outputs JSON -

is there way use javascript code inside php file uses header('content-type: application/json'); output in json format?

edit: i'm trying change color of css class when $est = 'crest'but javascript code printed along. javascript part inside comment /*here*/

<?php header('content-type: application/json');  $vs=array(); $vs1=array();  include("json/connectorcl.php");  if ((isset ($_get['ty'])) , (isset ($_get['est']))){     $nprocesso = $_get['ty'];     $est =  $_get['est'];   if ($est == 'crest') { $query2 = "select * patern crest='1'"; $result2 = oci_parse($connect, $query2); oci_execute($result2);  /*here*/ echo "<script type='text/javascript'> $('.time-title').css({'color':'blue'});</script>"; /*here*/ } else  { $query2 = "select * patern"; $result2 = oci_parse($connect, $query2); oci_execute($result2); }  while($res2 = oci_fetch_array($result2) , $res5 = oci_fetch_array($result5))  {  $a++;     $vs['id']= $a;  $vs['title']='vs - '.$res2['categoria_desc'];  $vs['startdate']=$res2['datamsg'];  $vs['enddate']=$res2['datamsg'];  $vs['description']= '1ºh - '.$res2['valor'].'| max - '.$res5['maxval'].'| min - '.$res5['minval'].'| avg - '.$res5['avgval'];  $vs['date_display']='ho';  $vs['icon']='plus_blue.png';  $vs['importance']='30';   $b=$a;  array_push($vs1,$vs); }  echo str_replace(array('[', ']'), '', htmlspecialchars(json_encode($vs1), ent_noquotes));}} 

if understand question right, yes can.

example, json.php

header('content-type: application/json'); echo json_encode(array('text' => 'im json baby'));