if statement - PHP-How to check if the textbox contains one word or two? -

Now I want to check if there is one or two words in this text box, for example

  if ($ _POST ['mytext'] == two words) {echo "this is absolutely correct"; } And {echo "we do not accept it"; }   
 and I tried  
  if ($ _POST ['mytext']> 1) {echo "this is absolutely correct"; } And {echo "we do not accept it"; }   
 And it is not working  
 This means how do I create it?  
 Thanks   
 
 
 If you define < two words < You can do something like:   $ mytext = $ _POST [/ em> as  "some letters after a few letters"  in the form of  Mytext "]; $ Parts = explosion ("", $ mytext); If (count ($ parts)! == 2) {New exception throw ("too much or too little!"); } If (strollen ($ parts [0]) === 0 || strollen ($ parts [1]) === 0 {throwing new exception ("not enough characters!"); }   
 Keep in mind that  "@!"