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# Use PHP to detect if given string is a proper email address

/ Published in: PHP
`function is_proper_email(\$email) {  // First, we check that there's one @ symbol, and that the lengths are right  if (!ereg("^[^@]{1,64}@[^@]{1,255}\$", \$email)) {    // Email invalid because wrong number of characters in one section, or wrong number of @ symbols.    return false;  }  // Split it into sections to make life easier  \$email_array = explode("@", \$email);  \$local_array = explode(".", \$email_array[0]);  for (\$i = 0; \$i < sizeof(\$local_array); \$i++) {     if (!ereg("^(([A-Za-z0-9!#\$%&#038;'*+/=?^_`{|}~-][A-Za-z0-9!#\$%&#038;'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))\$", \$local_array[\$i])) {      return false;    }  }    if (!ereg("^\[?[0-9\.]+\]?\$", \$email_array[1])) { // Check if domain is IP. If not, it should be valid domain name    \$domain_array = explode(".", \$email_array[1]);    if (sizeof(\$domain_array) < 2) {        return false; // Not enough parts to domain    }    for (\$i = 0; \$i < sizeof(\$domain_array); \$i++) {      if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))\$", \$domain_array[\$i])) {        return false;      }    }  }  return true;} //usage// \$email_result = is_proper_email(\$email_string);// \$email_result will be either true or false`