Get first letter of a word using PHP -


Is it possible to set variable validation only if the S in the front of the variable?

Example in my code: 

  $ a = "S0225"; $ B = "700 S4"; If (SRPO ($ A, 's')! == incorrect) {"echo"; // will pass this for it} if (SRPO ($ B, 'S')! == incorrect) {echo "PASS"; // For this reason, why is it too close, while I just want the beginning of the variable for the beginning of the S}    
 
 
 You can also use it for this purpose  
  if (substr ($ string_goes_here, 0, 1) === 'S') {// Pass}

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