- preg_match_all: documentation ( source)
- max: documentation ( source)
- strtolower: documentation ( source)
- ord: documentation ( source)
<?php
class PasswordValidation
{
public static function digitCount($string)
{
return self::occurrencesCount($string, '/[0-9]/');
}
public static function lcCount($string)
{
return self::occurrencesCount($string, '/[a-z]/');
}
public static function ucCount($string)
{
return self::occurrencesCount($string, '/[A-Z]/');
}
public static function nonAlphaNumCount($string)
{
return self::occurrencesCount($string, '/[^0-9a-zA-Z]/');
}
public static function repeatedCharCount($string)
{
$lcString = strtolower($string);
$prevChar = $lcString[0];
$currentLen = 0;
$maxLen = 0;
for ($i = 1; $i < strlen($lcString); $i++) {
if ($lcString[$i] === $prevChar) {
$currentLen += 1;
} else {
$currentLen = 1;
}
$maxLen = max($maxLen, $currentLen);
$prevChar = $lcString[$i];
}
return $maxLen;
}
public static function consecutiveCharCount($string)
{
$lcString = strtolower($string);
$prevChar = $lcString[0];
$currentLen = 0;
$maxLen = 0;
$ascending = null;
for ($i = 1; $i < strlen($lcString); $i++) {
$diff = ord($lcString[$i]) - ord($prevChar);
if ($diff == 1) {
if ($ascending !== true) {
$ascending = true;
$currentLen = 1;
}
$currentLen += 1;
} elseif ($diff == -1) {
if ($ascending !== false) {
$ascending = false;
$currentLen = 1;
}
$currentLen += 1;
} else {
$currentLen = 1;
}
$maxLen = max($maxLen, $currentLen);
$prevChar = $lcString[$i];
}
return $maxLen;
}
private static function occurrencesCount($string, $regex)
{
preg_match_all($regex, $string, $matches);
return count($matches[0]);
}
}
$string = "abcdefg";
if (strlen($string) === PasswordValidation::consecutiveCharCount($string)) {
echo "Password not allowed!";
}