javascript - PHP can I kill the script and have an alert? -

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I want to kill a script and post a warning on the same page

My code: 

  if (empty ($ _ POST ['item'])) {print '& lt; Script type = "text / javascript" & gt; '; Print 'alert ("item is required"); Print '& lt; / script & gt; '; }   
 The problem is that the script does not kill  
 is there a way to do that it kills the script, prints, and stops the same Page?   
 
 
 Use  
  Exit zero ([string $ Status]]   
  or   
  Exit zero (int $ position)   < P> To end your current  php  script.

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