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<?php function filterLabel($label) { $filtered = trim($label); $array = array($filtered => 1); $filtered = key($array); if ($filtered === false) { throw new UnexpectedValueException('Unable to filter %s', var_export($label, true)); } return $filtered; } $data = array("foo", "0foo", 0, 1, NULL, FALSE, new SimpleXMLElement('<root />')); foreach ($data as $index => $label) { printf("==== %d ====\n", $index); var_dump($label, filterLabel($label)); }
Output for git.master, git.master_jit, rfc.property-hooks
==== 0 ==== string(3) "foo" string(3) "foo" ==== 1 ==== string(4) "0foo" string(4) "0foo" ==== 2 ==== int(0) int(0) ==== 3 ==== int(1) int(1) ==== 4 ==== Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /in/AmnXj on line 5 NULL string(0) "" ==== 5 ==== bool(false) string(0) "" ==== 6 ==== object(SimpleXMLElement)#1 (0) { } string(0) ""

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