In PHP 7.x, ereg functions are no longer supported. Based on my search on internet, ereg functions use a very limited regex flavor called POSIX ERE.

Below example shows the alternative method in preg functions

ereg functionsRecommended functions

ereg

$source = "My email address is ck@qsok.com";
if (ereg("email", $source)) {
  echo "the source has 'email' on the content";
}


preg_match

$source = "My email address is ck@qsok.com";
if (preg("/email/", $source)) {
  echo "the source has 'email' on the content";
}