anthony / Simple equivalents of Oracle functions

<?php /** * Simple php equivalent of Oracle's coalesce() * * It can be used as simple oneline-alternative to switch or if operators in many * cases without difficult logic. For example, get first non-empty value from bunch of vars: * * echo coalesce($var1, $var2, $var3, ...); * * is alternative to: * * if ($var1) { * return $var1; * } elseif ($var2) { * return $var2; * } elseif .... * * or * * return $var1 ?? $var2 ?? $var3 ... * * @see https://docs.oracle.com/cd/B28359_01/server.111/b28286/functions023.htm * @author Anthony Axenov * @return mixed|null */ function coalesce() { foreach (func_get_args() as $arg) { if (is_callable($arg)) { $arg = call_user_func($arg); } if ($arg !== null) { return $arg; } } return null; } //usage: $var1 = null; $var2 = function() use ($var1) { return $var1; }; $var3 = 3; $var4 = '4'; $result = coalesce($var1, $var2, $var3, $var4); var_dump($result);

<?php /** * Simple php equivalent of Oracle's decode() * * It can be used as simple oneline-alternative to switch or if operators in many * cases without difficult logic. For example, get string mnemocode of some value: * * echo 'State: '.decode($state, 0, 'disabled', 1, 'enabled', 'unknown'); * * will output: * 'State: disabled' if $state === 0 * 'State: enabled' if $state === 1 * 'State: unknown' in other cases * * This is how decode() works: * 1) Store first argument separately from other ones to compare them with it * 2) Reduce and reindex array of arguments from 0 * 3) Detect default value: * 3.1) If count of fresh args array is odd (which means that decode() was called * with even args count) then the last known argument is default result. * We also need to reduce and reindex args array here. * 3.2) If count is even, then default result === null. * 4) The rest of args processing this way: * - every even argument (n, n+2, n+4,...) is possible value; * - every odd arg (n+1, n+3, n+5,...) is result for previous arg. * * @see https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm * @author Anthony Axenov * @return mixed */ function decode() { $args = func_get_args(); $expression = $args[0]; unset($args[0]); $args = array_values($args); if (count($args) % 2 !== 0) { $default = $args[count($args) - 1]; unset($args[count($args) - 1]); $args = array_values($args); } else { $default = null; } for ($i = 0; $i < count($args); $i += 2) { if ($expression === $args[$i] && isset($args[$i + 1])) { return is_callable($args[$i + 1]) ? call_user_func($args[$i + 1]) : $args[$i + 1]; } } return $default; } // usage: $somevar = 'function'; $anything = 'Lorem ipsum dolor sit amet'; $result = decode($somevar, // 0 true , 'decode(): boolean true', // 1 0 , 'decode(): int zero', // 2 '0' , 'decode(): string zero', // 3 'string' , 'decode(): just string', // 4 'function', function() use ($anything) { // 5 // bla-bla-bla some logic here $anything = explode(' ', $anything); return 'Hey, this is '.print_r($anything, true); }, 'decode(): default result' // 6 -- comment this line to get null ); var_dump($result);