Php verifies whether the user name starts with a letter and the verification password can only be a combination of numbers and letters

Source: Internet
Author: User
The code is as follows: Copy code
Function is_email ($ email)
 {
If (preg_match ("/[A-Za-z0-9] + @ [A-Za-z0-9] +. [a-z] {2, 4}/", $ email, $ mail ))
  {
Return true;
  }
Else
  {
Return false;
  }
 }

/**
* Verify that the user name starts with a letter
*/
 

The code is as follows: Copy code
Function is_user_name ($ user)
 {
If (preg_match ("/^ [a-za-z] {1} ([A-Za-z0-9] | [. _]) {3, 19} $/", $ user, $ username ))
  {
Return true;
  }
Else
  {
Return false;
  }
 }

/**
* The verification password can only be a combination of numbers and letters
*/
 

The code is as follows: Copy code
Function is_ps Tutorial d ($ psd)
 {
If (preg_match ("/^ (w) {4, 20} $/", $ psd, $ password ))
  {
Return true;
  }
Else
  {
Return false;
  }
 }
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