php username, password, phone number, legal judgment code

The article has three commonly used functions, which are to determine whether it is a legal username, to determine whether it is a legal user password, and to determine whether it is a legal phone number. These three functions are indispensable in development. The example code is as follows:

// Function name: CheckUser($C_user)

// Function: Determine whether it is a legal user name

// Parameters: $C_user (user name to be detected)

// Return value: Boolean value

//Remarks: None

function CheckUser($C_user)

{

if (!CheckLengthBetween($C_user, 4, 20)) return false; / /width check

if (!ereg("^[_a-zA-Z0-9]*$", $C_user)) return false; //Special character check

return true;

}

// Function name: CheckPassword($C_passwd)

// Function: Determine whether it is a legal user password

// Parameters: $C_passwd (password to be detected)

// Return Value: Boolean value

//Remarks: None

/

function CheckPassword($C_passwd)

{

if (!CheckLengthBetween($C_passwd, 4, 20) ) return false; //Width detection

if (!ereg("^[_a-zA-Z0-9]*$", $C_passwd)) return false; //Special character detection

return true ;

}

// Function name: CheckTelephone($C_telephone)

// Function: Determine whether it is a legal phone number

// Parameter: $C_telephone (to be detected Phone number)

// Return value: Boolean value

// Remarks: None

//----------------------------- -------------------------------------------------- -------------

function CheckTelephone($C_telephone)

{

if (!ereg("^[+]?[0-9]+([xX -][0-9]+)*$", $C_telephone)) return false;

return true;

}