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<?php $tests = [ '[] == false' => [] == false, '[0] == true' => [0] == true, '"" == false' => '' == false, '"ABC" == false' => 'ABC' == false, '"0" == false' => '0' == false, '"1" == true' => '1' == true, '"123" == false' => '123' == true, 'null == false' => null == false, '0 == false' => 0 == false, '0.49 == false' => 0.49 == false, 'undefined == false' => $xyz == false ]; function _setType($var, $type) { settype($var, $type); $var; } function testTypeCasting($val) { static $types = ["bool", "int", "float", "string", "array", "object", "null"]; $result = []; foreach ($types as $type) { $result[$type] = _setType($val, $type); } } var_dump(testTypeCasting("777")); /* $i = 0; foreach($tests as $name => $val) { echo ++$i . ') ' . $name . ' => ' . ($val ? 'T' : 'F') . "\n"; } */

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