Several functions were given new, optional parameters in PHP 5.4:
Added the optional
limitparameter to debug_backtrace() and debug_print_backtrace(), to limit the amount of stack frames returned.
- is_link() now works properly for symbolic links on Windows Vista or later. Earlier systems do not support symbolic links.
- parse_url() now recognizes the host when a scheme is omitted, and a leading component separator is present. As of PHP 5.4.7.
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