Function eregi is deprecated (workaround) _php tips

After PHP has been upgraded to php5.3, the procedure that is used frequently discovers that a function eregi () is deprecated error message. What's the reason?
This is because the eregi () function is no longer supported in php5.3, and the Preg_match () function is used instead.
The workaround is to replace the eregi () function with the Preg_match () function.
if (eregi (' ^test ', $file))
can be replaced by
if (Preg_match ('/^test/i ', $file))

————-
The regex after PHP 5.3.0, which would like to use the PCRE specification, POSIX regex does not recommend the use of the (System regex, avoid too many rules?).
So the following is a list of proposed function (POSIX) that is not recommended for use (PCRE), which is detailed: PHP:
Differences from POSIX Regex
* Posix→pcre
* Ereg_replace () →preg_replace ()
* Ereg () →preg_match ()
* Eregi_replace () →preg_replace ()
* EREGI () →preg_match ()
* Split () →preg_split ()
* Spliti () →preg_split ()
* Sql_regcase () →no equivalent
* Need a Regex split, use Preg_split () instead
* Do not need a regex, as long as you want to quickly split a fixed string, you can use explode () instead. (Faster than a regex is needed)