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<?php $tests = array( "42", 1337, 0x539, '0x539', 02471, '0000002471', (int)'02479', (int)'02471', 0b10100111001, '0b10100111001', 1337e0, '1337e0', "not numeric", array(), 9.1 ); foreach ($tests as $element) { var_export($element); if (is_numeric($element)) { echo " is numeric", PHP_EOL; } else { echo " is NOT numeric", PHP_EOL; } }
Output for git.master, git.master_jit, rfc.property-hooks
'42' is numeric 1337 is numeric 1337 is numeric '0x539' is NOT numeric 1337 is numeric '0000002471' is numeric 2479 is numeric 2471 is numeric 1337 is numeric '0b10100111001' is NOT numeric 1337.0 is numeric '1337e0' is numeric 'not numeric' is NOT numeric array ( ) is NOT numeric 9.1 is numeric

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