How to filter and highlight illegal characters for whygod!

? I'm just doing a test. if you use a string similar to tmd, be sure to note that if the character in the string appears in $ StartReplaceHtml or $ EndReplaceHtml, you need to modify the following preg_replace rule $ CheckedMessageHello !! He X... he... X... of... Howareyoumd; themessagetobechecke // I'm just doing a test. if you use a string similar to tmd, you must note that if the character in the string appears in $ StartReplaceHtml or $ EndReplaceHtml, you need to modify the rules in the following preg_replace.
$ CheckedMessage = "Hello !! He X... he... X... of... How are you m d "; // the message to be checked
Echo $ CheckedMessage ."
";
$ CheckedWords = array ("its X", "tmd"); // The Invalid character to be filtered. if you need to filter a single character, for example: ererX000 filters out his, X, and so on, you don't have to set the filter character to "his X" as long as it is set to $ CheckedWords = array ("He ", "X", "");
$ StartReplaceHtml =" ";
$ EndReplaceHtml ="";
$ CheckOther = true; // sets the flag to whether a single character is displayed. if it is set to true, the following if (strstr ......) No
For ($ I = 0; $ I If (strstr ($ CheckedMessage, $ CheckedWords [$ I]) {// this can be removed
$ CheckedMessage = eregi_replace ($ CheckedWords [$ I], $ StartReplaceHtml. $ CheckedWords [$ I]. $ EndReplaceHtml, $ CheckedMessage); // If you only filter strings such as "X" (string, not a single character), you can directly write this sentence, set $ CheckOther to false.
}
If ($ CheckOther = true ){
$ CharStringLength = strlen ($ CheckedWords [$ I]);
For ($ j = 0; $ j <$ CharStringLength; $ j ++ ){
$ AssumeLength = 1; // assume the truncation length.
If (ord (substr ($ CheckedWords [$ I], $ j, $ AssumeLength)> 0xa0) {// if the Chinese character is entered, add one to the length
$ AssumeLength ++;
}
$ SubstrChar = substr ($ CheckedWords [$ I], $ j, $ AssumeLength );
$ CheckedMessage = preg_replace ("/(? If ($ AssumeLength! = 1) {// if the current truncated character is a Chinese character
$ J ++;
}

}
}
}
Echo $ CheckedMessage;
// It's just a simple test. I hope it will be helpful to you, and I hope you can put it together. good luck!

?>