PHP special Character Filtering comprehensive example

Special characters for filtering strings function Checkform () { var username = Document.theform.user_name.value; var realname = Document.theform.real_name.value; var passwd = Document.theform.passwd.value; var passwd2 = Document.theform.passwd2.value; var email = document.theform.email.value; var question = Document.theform.question.value; var answer = Document.theform.answer.value; var address = Document.theform.address.value; var phone = Document.theform.phone.value; var answer = Document.theform.answer.value; var checkdata =/<|>| ' |;| &|#| "|" /; var checkusername =/[^0-9]/; var checkmail =/^ ([a-za-z0-9_-]) +@ ([a-za-z0-9_-]) + (. [ A-za-z0-9_-]) +/; var checkphone =/[^0-9-]/; if (username = = "") { Alert ("User name cannot be empty!") "); return false; } if (passwd = = "") { Alert ("Password cannot be empty!") "); return false; } if (Realname = = "") { Alert ("Real name cannot be empty!") "); return false; } if (question = = "") { Alert ("Password problem cannot be empty!") "); return false; } if (answer = = "") { Alert ("The password question answer cannot be empty!") "); return false; } if (email = = "") { Alert ("e-mail cannot be empty!") "); return false; } if (Checkusername.test (username)) { }else{ Alert ("Username cannot be all numbers!") "); return false; } if (Checkdata.test (username)) { Alert ("User name contains illegal characters, please do not use special characters!") "); return false; } if (Username.length > | | username.length < 3) { Alert ("User name length does not meet the requirements" 3-28 characters "username.length"); return false; } if (passwd! = passwd2) { Alert ("Two input passwords are inconsistent!"); return false; } if (Passwd.length > | | passwd.length < 5) { Alert ("The password length does not meet the requirement" 5-28 characters ""); return false; } if (Checkdata.test (realname)) { Alert ("real name contains illegal characters, please do not use special characters!") "); return false; } if (Realname.length > | | realname.length < 3) { Alert ("The true name length does not meet the requirement" 3-28 characters ""); return false; } if (Question.length > 98 | | question.length < 3) { Alert ("The password hint question length does not meet the requirements" 6-98 characters ""); return false; } if (Answer.length > 98 | | answer.length < 3) { Alert ("The question answer length does not meet the requirement" 3-98 characters ""); return false; }//Scripting Academy http://bbs.it-home.org if (! checkmail.test (email)) { Alert ("E-mail contains illegal characters!"); return false; } if (Email.length > | | email.length < 5) { Alert ("e-mail length does not meet the requirements" 5-48 characters ""); return false; } if (checkdata.test (address)) { Alert ("The contact address contains illegal characters! "); return false; } if (Address! = "" && address.length > 48) { Alert ("The contact address length does not meet the requirement" within 48 characters "); return false; } if (checkphone.test (phone)) { Alert ("The contact number contains illegal characters! "); return false; } if (Address! = "" && (Phone.length > 18 | | Phone.length < 7)) { Alert ("Contact phone length does not meet the requirement" 7-18 characters ""); return false; } } Copy Code PHP Filter Special characters utility function php form Submit special character filter method HTML special character filter PHP class URL link special character escape method php special character escape detailed PHP filter parameters special characters anti-injection PHP Methods for filtering illegal and special strings examples of PHP special character handling functions

