Super Novice asks PHP for the simplest questions

Super Novice asks PHP the simplest question
$mobile value is 123456

 
  
Echo $mobile

?>

Normal output above

 
  
' Mobile ' = ' echo $mobile '

?>

This is not going to happen, I would like to ask how this should be done to lose the results
' Mobile ' = ' 123456 '


PHP Echo

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------Solution--------------------

         ' sn ' = ' sdk-wll-010-00133 ',//account provided
         ' PWD ' =>strtoupper (MD5 (' sdk-wll-010-00133 ') b6aedea-'),//Here the password needs to be encrypted for MD5 (Sn+password) 32-bit uppercase
         ' Mobile ' + ', '. $shoujihao. ',//Mobile phone number separated by a comma in English there is no length limit for post theory. Recommended mass once less than or equal to 10,000 mobile phone number
         ' Content ' = ' order success ',//SMS content;
         ' ext ' = ',
         ' Rrid ' = ' + ',//default NULL if NULL returns the system-generated identity string if the value is guaranteed to be the only successful return value passed in
         ' Stime ' = ' + '//Timing time format 2011-6-29 11:09:21
         

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