php - Conditional return empty fields instead true or false -

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I have the following problem.

When I try to log in, this is an empty field 

  $ left = $ right = FALSE; $ Correct = $ end & lt; ($ Index + 1) * $ arr [$ index] ['sec'] & amp; Amp; $ End & gt; $ Index * $ arrival [$ index] ['seconds']; $ Left = ($ start <($ index + 1) * $ arr [$ index] ['sec']) & amp; ($ start> = $ index * $ arr [$ index] [' Sec '])); Echo $ left "-". $ Right ". & Lt; / br & gt;";    
 
 
 When you resonate  false  boolean, then it For the purpose of debugging purposes, use  var_dump , as it will show you the exact value of the variable, this is an empty string  ''   
 To display the string value of  incorrect  and  true , use a threesome:  
 resonance ($ left? "True": "wrong"). "-". ($ True? "True": "wrong"). "";

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