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- dongmo20030416 2019-05-16 12:15关注
$st= "0090C9 00AV0X7Y79T543C 00AV0X6Y103T245C 00AV0X60Y103T248C 00AV0X101Y103T24B8 00AV0X131Y103T24BB 00AV0X10Y111T0484 00AV0X63Y111T048C 00AV0X133Y111T04BA 00AV0X151Y111T04BA 00AV0X166Y56T1499 00AV0X167Y61T1496 00AV0X17Y124T2491 00AV0X11Y129T2490 00AV0X14Y125T248F 00AV0X14Y130T248B 00AV0X17Y129T2496 00AV0X10Y134T248B 00AV0X34Y134T2491 00AV0X10Y149T2491 00AV0X10Y152T248B"; $ret = ""; //split the string by newline $splitted = trim(explode(" ", $st)); foreach ($splitted as $s2) { //overwrite a random char in this chunk of the string with the first '?' $s2[rand(0, count($s2))] = '?'; //overwrite a random char in this chunk of the string with the second '?' $s2[rand(0, count($s2))] = '?'; //this '?' may overwrite the first one //concatenate a string with this chunk plus '??' (that stand now instead of newline) $ret = $ret . $s2 . "??"; } //show the resulting string var_dump($ret);
Note: may happen the two random '?' are put in the same place for a chunk of string, so resulting only one '?' in a chunk of string. (Of course it can be prevented).
It's not required to know the char to replace, if you overwrite it.
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