Post-Module PHP Introduction BTM 395: Internet Programming

PHP string quoting ' (single quote): for literal strings with minimal text expansion (\\ and \' only) " (double quote): for flexible strings with expansion of variables and many codes (e.g. \n and \t) Heredoc: for lengthy strings with complex plain-text format (see –Begins with <<<ANY_DELIMITER –Ends with ANY_DELIMITER; as the only contents of closing line –Expands variables similarly to " –Advantage: no need to escape ' or " –Nowdoc format works like single quote equivalent of heredoc Official reference:

Array indexing ALL arrays in PHP are associative arrays Numeric indices are automatically generated, but the arrays are still fully associative Arrays can have both flexible associative keys and auto-generated numeric keys Official reference:

Customized array sorting PHP has many built in array sort functions, for sorting by value, by key, and backwards JavaScript only has one very limited built-in sort: lexicographic (strict alphabetic) sort Both have custom sort functions that work similarly –JavaScript: myArray.sort(function(a,b){…});JavaScript –PHP:usort($myArray,customSortFunction); customSortFunction(a,b){…};PHP –These can sort any kind of array anyway you like, including multidimensional arrays

Other PHP tips Equality and assignment = vs == vs === The ternary (conditional) operator ? : –$myVar = $testCondition ? $valueIfTrue : $valueIfFalse; –Ternary operator exerciseTernary operator exercise Stop an infinite loop in PHP –Click the stop or cancel button on your browser to stop the page loading –Or just wait 30 seconds or so for a server timeout

Sources Heredoc example: