eregi — Case insensitive regular expression match

eregi — Case insensitive regular expression match
This function is identical to ereg() except that it ignores case distinction when matching alphabetic characters.
int eregi ( string $pattern , string $string [, array &$regs ] )
pattern - Case insensitive regular expression.
string - The input string.
regs - If matches are found for parenthesized substrings of pattern and the function is called
with the third argument regs , the matches will be stored in the elements of the array regs .
$regs[1] will contain the substring which starts at the first left parenthesis; $regs[2] will
contain the substring starting at the second, and so on. $regs[0] will contain a copy of the
complete string matched.

= 'XYZ';
if (
eregi('z', $string)) {
"'$string' contains a 'z' or 'Z'!";