如何替换PHP中的精确内容
我正在制作一个非常简单的解密脚本，我可以解决一个问题如何替换PHP中的精确内容,php,Php,我正在制作一个非常简单的解密脚本，我可以解决一个问题 <?PHP // Define arrays $search = array("3", "4", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "1", "2"); $replace = array("A", "B", "C",
<?PHP
// Define arrays
$search = array("3", "4", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "1", "2");
$replace = array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");
$display = "Please Enter Encrypted Message!";
if ($_POST['submit'] == "Submit")
{
// Get post data
$subject = $_POST['encrypted'];
$result = str_replace($search, $replace, $subject);
$display = "Decrypted Message: {$result}";
}
?>
<html>
<head>
<title>Encryption</title>
</head>
<body>
<form method="post" action="encryption.php">
<input type="text" name="encrypted" /><br />
<input type="submit" name="submit" value="Submit" />
</form>
<?PHP echo $display; ?>
</body>
</html>
加密
提前谢谢 尝试对$search和$replace进行重新排序，以便将较大的数字放在第一位。在更换1和7之前，您需要更换17。这样，脚本中的任何N都将在任何Y或D之前被替换。您可能会更好地遍历从$\u帖子中输入的值，并将它们与数组值进行匹配。类似这样的方法会奏效：
// Use $search as the array key and $replace as the value
$combi = array_combine($search, $replace);
$display = "Please Enter Encrypted Message!";
if ($_POST['submit'] == "Submit")
{
// Get post data
$subject = $_POST['encrypted'];
// Split our post data into an array
$chars = explode(' ', $subject);
// Loop over each character entered and get
// the corresponding value back from our combi array
foreach($chars as $char) {
$result .= $combi[$char];
}
$display = "Decrypted Message: {$result}";
}
Ref:，非理想但快速的解决方案-尝试重新排序搜索并替换字符，使其大小顺序相反-这样您就不会遇到此问题。作为替代方案。不要试图在单个
stru replace