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<?php function runTest($v) { echo "Test case for "; var_dump($v); var_dump(is_numeric($v)); echo "\n\n"; } runTest('3'); runTest(3); runTest('1'); runTest(1); runTest('0'); runTest(0); runTest('-1'); runTest(-1); runTest(null); runTest(''); runTest(false);
Output for git.master, git.master_jit, rfc.property-hooks
Test case for string(1) "3" bool(true) Test case for int(3) bool(true) Test case for string(1) "1" bool(true) Test case for int(1) bool(true) Test case for string(1) "0" bool(true) Test case for int(0) bool(true) Test case for string(2) "-1" bool(true) Test case for int(-1) bool(true) Test case for NULL bool(false) Test case for string(0) "" bool(false) Test case for bool(false) bool(false)

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