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   $runningnumber=1;
   $comp = "CT";
   echo $result = $comp.date('mdy').str_pad($runningnumber++, 5, "0", 
   STR_PAD_LEFT);

我如何增加 $runnungnumber 像 00001, 00002, 00003, 00004, 00005, 00006 .... 请帮忙

我想要的输出是

CT08221700001
CT08221700002
CT08221700003
CT08221700004
CT08221700005
4

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