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<?php // Everything you enter here will be executed by our servers. Try it! if(preg_match("/^[0-9]+$/", '123')){ echo 'true'; } else{ echo 'false'; } if(preg_match("/^[0-9]+$/", '123.0')){ echo 'true'; } else{ echo 'false'; } if(preg_match("/^[0-9]+$/", '123,0')){ echo 'true'; } else{ echo 'false'; } if(preg_match("/^[0-9]+$/", '123aab0')){ echo 'true'; } else{ echo 'false'; } ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
truefalsefalsefalse