51 lines
1.1 KiB
PHP
51 lines
1.1 KiB
PHP
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<?php
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/**
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* Simple php equivalent of Oracle's coalesce()
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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 first non-empty value from bunch of vars:
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*
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* echo coalesce($var1, $var2, $var3, ...);
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*
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* is alternative to:
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*
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* if ($var1) {
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* return $var1;
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* } elseif ($var2) {
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* return $var2;
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* } elseif ....
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*
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* or
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*
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* return $var1 ?? $var2 ?? $var3 ...
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*
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* @see https://docs.oracle.com/cd/B28359_01/server.111/b28286/functions023.htm
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* @see https://gist.github.com/anthonyaxenov/f30961849d5bfb2651901af120607694
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* @author Anthony Axenov
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* @return mixed|null
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*/
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function coalesce() {
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foreach (func_get_args() as $arg) {
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if (is_callable($arg)) {
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$arg = call_user_func($arg);
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}
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if ($arg !== null) {
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return $arg;
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}
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}
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return null;
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}
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//usage:
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$var1 = null;
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$var2 = function() use ($var1) {
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return $var1;
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};
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$var3 = 3;
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$var4 = '4';
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$result = coalesce($var1, $var2, $var3, $var4);
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var_dump($result);
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