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1->0001 56->0056 288->0288 1992->1992 // echo sprintf("%04d", $num+1); echo str_pad($num,4,"0",STR_PAD_LEFT);//4是固定位数,0是要加的固定值,STR_PAD_LEFT是左边插入,末尾加用STR_PAD_RIGHT
$num=123;
$num=str_pad($num,4,"0",STR_PAD_LEFT);
echo $num;
结果为:0123
以上皆可