New string functions: str_startswith() and str_endswith()

Attached you'll find a patch against PHP_5_3 that implements two new string functions: str_startswith(haystack, needle [, case_sensitivity]) checks if haystack starts with needle. The check is performed case-insensitively, but this can be overridden by passing TRUE as the value for the third parameter. The second function str_endswith(haystack, needle [, case_sensitivity]) checks if haystack ends with needle and has the same semantics regarding case-sensitivity. I admit that both functions can be easily implemented in userland with already existing functions. At the same time I like them because they make the common tasks of prefix and suffix checks easy and convenient. I won't mind if you guys don't like the idea (I did it mainly for personal entertainment and learning about PHP internals), but if you are interested I'll happily provide a patch for HEAD, too. Also since this is my first foray into PHP internals, comments and corrections are more then appreciated. Martin

Attachment: [text/x-diff] php5.3-strings.patch