Oracle Tutoring, Campbell River, BC
(250) 203-6544 (text) or (250) 830-0295 (talk)
Self-tutoring about regex: the tutor mentions the newline in a detection pattern. In PHP regex, \n means ‘newline’. Therefore, $pat=’/\n/’; will be found in a string containing a newline. Source: w3schools.com
Self-tutoring about PHP and regular expressions: the tutor looks into whether hyphen is a word character. From time to time I wonder about this — I think I knew but have forgotten. Anyway, I’ve checked today and it seems that …
Self-tutoring about “importing” artefacts in PHP: the tutor begins… In PHP, you can bring code from other files using, among other methods, require_once(‘a_file’); What if you end up using require_once multiple times to bring in different libraries, but two happen …
Self-tutoring about PHP comparisons: the tutor begins… In PHP, == means “compare for equality” whereas === means “compare for same type and equality.” Sometimes the difference is important. strpos(longstring, shortstring) tells where, in the longstring, you will find the shortstring. …
Self-tutoring about PHP: the tutor mentions its exponent operator. In PHP, 32 is 3**2. This seems to work unless the base is negative. For instance, 2.6**2.9 and 10**(-2/3) will come out correctly, but (-8)**(1/3) won’t, in my experience. Source: php.net
Self-tutoring about PHP: the tutor mentions an idea about PHP global. Consider the file $var1=”hello”; function f1(){ echo $var1; } f1(); //call f1 In the code above, with almost any programming language I know of, $var1 has value “hello” in …
Self-tutoring about PHP: the tutor looks into the hazard of register_globals. In PHP, register_globals, when set to 1 (or on), could allow variables to be created and set from within web requests. In particular, if a variable was uninitialized in …
Computer science: PHP: the register_globals phenomenon Read more »