What is x7f and xff in php?
Is it hexa or octal values?
It is given in PHP 5.3 manual that, as a regular expression, class name would be expressed as: [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*.
can any one help what is the meaning of \x7f-\xff in above regular expression?
As per the integer page on PHP.net, the format of hex in PHP is:
hexadecimal : 0[xX][0-9a-fA-F]+
thus it's hex.