70 lines
2.4 KiB
PHP
70 lines
2.4 KiB
PHP
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<?php
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/**
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* Simple php equivalent of Oracle's decode()
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*
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* It can be used as simple oneline-alternative to switch or if operators in many
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* cases without difficult logic. For example, get string mnemocode of some value:
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*
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* echo 'State: '.decode($state, 0, 'disabled', 1, 'enabled', 'unknown');
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*
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* will output:
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* 'State: disabled' if $state === 0
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* 'State: enabled' if $state === 1
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* 'State: unknown' in other cases
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*
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* This is how decode() works:
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* 1) Store first argument separately from other ones to compare them with it
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* 2) Reduce and reindex array of arguments from 0
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* 3) Detect default value:
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* 3.1) If count of fresh args array is odd (which means that decode() was called
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* with even args count) then the last known argument is default result.
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* We also need to reduce and reindex args array here.
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* 3.2) If count is even, then default result === null.
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* 4) The rest of args processing this way:
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* - every even argument (n, n+2, n+4,...) is possible value;
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* - every odd arg (n+1, n+3, n+5,...) is result for previous arg.
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*
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* @see https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm
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* @see https://gist.github.com/anthonyaxenov/510c92931e2cfa63633d7ab1e4465133
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* @author Anthony Axenov
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* @return mixed
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*/
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function decode()
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{
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$args = func_get_args();
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$expression = $args[0];
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unset($args[0]);
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$args = array_values($args);
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if (count($args) % 2 !== 0) {
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$default = $args[count($args) - 1];
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unset($args[count($args) - 1]);
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$args = array_values($args);
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} else {
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$default = null;
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}
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for ($i = 0; $i < count($args); $i += 2) {
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if ($expression === $args[$i] && isset($args[$i + 1])) {
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return is_callable($args[$i + 1]) ? call_user_func($args[$i + 1]) : $args[$i + 1];
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}
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}
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return $default;
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}
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// usage:
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$somevar = 'function';
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$anything = 'Lorem ipsum dolor sit amet';
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$result = decode($somevar, // 0
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true , 'decode(): boolean true', // 1
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0 , 'decode(): int zero', // 2
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'0' , 'decode(): string zero', // 3
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'string' , 'decode(): just string', // 4
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'function', function() use ($anything) { // 5
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// bla-bla-bla some logic here
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$anything = explode(' ', $anything);
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return 'Hey, this is '.print_r($anything, true);
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},
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'decode(): default result' // 6 -- comment this line to get null
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);
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var_dump($result);
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