PHP에서 js 메소드를 실행하는 방법

<script type="text/javascript" > var url="aaaa*"; </script> 
<? 
$key="<script type=text/javascript>document.write(url)</script>";
 echo $key; ?>

<script type="text/javascript"> 
function test() {   
var t1=3;   
t1 = t1+2;   
alert(t1);   //return t1; } 
</script>
<?php 
echo "<script type=&#39;text/javascript&#39;>
test();
</script>"; 
?>

<?php
    echo   "
<script   language=javascript>
  function   test(){
    alert( &#39;hello &#39;);    
  }
</script> ";
 
?>
<input   type=button   value=click   onclick= &#39;test() &#39;>