add letter JO on the autoincrement data produce

[newphpcoder]

Hi..I have code for auto increment of JO Number, now it display:120504001by using this code:

<?php  $sql = "SELECT jo_number FROM job_order ORDER BY jo_date DESC LIMIT 1";	    $result = mysql_query($sql, $con);	   	    if (!$result) {		    echo 'failed';		    die();	    }	    $total = mysql_num_rows($result);	    if ($total <= 0) {		    $currentSRNum = 1;			 $currentYear  = (int)(date('y'));		    $currentMonth = (int)(date('m'));		    $currentDay = (int)(date('d'));		  		    $currentSRYMD = substr($row['jo_number'], 0, 6);		    $currentYMD = date("ymd");		    if ($currentYMD > $currentSRYMD)		    { 			    $currentSRNum = 1;		    }		    else		    { 			    $currentSRNum += 1;		    }					    }	    else {//------------------------------------------------------------------------------------------------------------------		    // Stock Number iteration....		    $row = mysql_fetch_assoc($result);		   		    $currentSRNum = (int)(substr($row['jo_number'],0,3));		   		    $currentSRYear  = (int)(substr($row['jo_number'],2,2));		    $currentSRMonth = (int)(substr($row['jo_number'],0,2));		   $currentSRNum = (int)(substr($row['jo_number'],6,4));		    $currentYear  = (int)(date('y'));		    $currentMonth = (int)(date('m'));		    $currentDay = (int)(date('d'));		  		    $currentSRYMD = substr($row['jo_number'], 0, 6);		    $currentYMD = date("ymd");		    if ($currentYMD > $currentSRYMD)		    { 			    $currentSRNum = 1;		    }		    else		    { 			    $currentSRNum += 1;		    }										  	    }//------------------------------------------------------------------------------------------------------------------			    $yearMonth = date('ymd');   	    $currentSR = $currentYMD . sprintf("%03d", $currentSRNum);?>

now I want it to be:JO120504001JO120504002JO120504003JO120504004JO120505001JO120504002JO120504003Any help is highly appreciated.Thank you so much

[birbal]

if you want php to print it you can prepend "JO" before it before printing echo "JO{$row['jo_num']}";