concatenation - How to add A through Z at the end of a string PHP -


what doing taking vehicle vin number , taking last 6 digits of , storing stock number. issue have have function goes , checks database make sure stock number exists. if (can have same vehicle in inventory again buy back, etc) want concat @ end of sting through z. 

if(strlen($vin) > 9) {     $stocknum = substr($vin,-6);     while(verfiyunique($mysqli, $stocknum) != true) {         if(strlen($stocknum < 7)) {             $stocknum = substr($vin,-6) . "a";         }else{             ?         }     }     return $stocknum;

how increment lets b or b c if match?

thanks in advance help!

you increment ascii number , use chr() function convert relevant character. e.g.: chr(65) output a

see http://php.net/manual/en/function.chr.php more info link ascii table.


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