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php Programming Glossary: array_key_existsHow to evaluate formula passed as string in PHP? http://stackoverflow.com/questions/1015242/how-to-evaluate-formula-passed-as-string-in-php if preg_match ' ^ a z w ' token and in_array token args if array_key_exists token this v stack i this v token else return this trigger undefined.. too many arguments arg_count given 1 expected elseif array_key_exists fnn this f if arg_count count this f fnn 'args' return this.. against parentheses... if in_array matches 1 this fb or array_key_exists matches 1 this f it's a func stack push val stack push 1 stack..
PHP Create a Multidimensional Array from an array with relational data [duplicate] http://stackoverflow.com/questions/11239652/php-create-a-multidimensional-array-from-an-array-with-relational-data as n p parent was not seen before put on root if array_key_exists p childrenTable childrenTable p array data p childrenTable.. array data p childrenTable p child was not seen before if array_key_exists n childrenTable childrenTable n array root node has a parent.. n array root node has a parent after all relocate if array_key_exists n data unset data n childrenTable p n childrenTable n unset..
What is the most accurate way to retrieve a user's correct IP address in PHP? http://stackoverflow.com/questions/1634782/what-is-the-most-accurate-way-to-retrieve-a-users-correct-ip-address-in-php 'HTTP_FORWARDED' 'REMOTE_ADDR' as key if array_key_exists key _SERVER true foreach explode ' ' _SERVER key as ip ip trim..
isset() and empty() make code ugly http://stackoverflow.com/questions/1960509/isset-and-empty-make-code-ugly I don't like what inflicting hundreds of isset empty and array_key_exists s does to my code. It gets bloated becomes less readable without.. td tr php endif table If you find yourself regularly using array_key_exists you should evaluate what you're using it for. The only time.. is here array array 'key' null isset array 'key' false array_key_exists 'key' array true As stated above though if you're properly initializing..
List of Big-O for PHP functions http://stackoverflow.com/questions/2473989/list-of-big-o-for-php-functions ... foreach array_of_number number result_array number array_key_exists number large_prime_array This is because in_array is implemented.. will linearly slow down as prime_array grows. Where the array_key_exists function is implemented with a hash lookup O 1 which will not.. effect. For example the difference between a call to array_key_exists at N 1 and N 1 000 000 is ~50 time increase. Interesting Points..
http://stackoverflow.com/questions/254514/php-and-enumerations strict false constants self getConstants if strict return array_key_exists name constants keys array_map 'strtolower' array_keys constants..
Sort an array based on another array? http://stackoverflow.com/questions/348410/sort-an-array-based-on-another-array orderArray ordered array foreach orderArray as key if array_key_exists key array ordered key array key unset array key return ordered..
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