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<?php var_dump( (string) true, filter_var(true, FILTER_VALIDATE_INT), (string) false, filter_var(false, FILTER_VALIDATE_INT), (string) 1.1, filter_var(1.1, FILTER_VALIDATE_INT), (string) 0.0, filter_var(0.0, FILTER_VALIDATE_INT), (string) '0.0nb', filter_var('0.0', FILTER_VALIDATE_INT), (string) '-0.0', filter_var('-0.0', FILTER_VALIDATE_INT) );
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(1) "1" int(1) string(0) "" bool(false) string(3) "1.1" bool(false) string(1) "0" int(0) string(5) "0.0nb" bool(false) string(4) "-0.0" bool(false)

preferences:
132.12 ms | 403 KiB | 169 Q