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<?php var_dump(filter_var('example.com', FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_OPTIONAL)); var_dump(filter_var('//example.com', FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED)); var_dump(filter_var('/index.php', FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_OPTIONAL|FILTER_FLAG_HOST_OPTIONAL)); var_dump(filter_var('/index.php', FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED|FILTER_FLAG_HOST_REQUIRED));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "FILTER_FLAG_SCHEME_OPTIONAL" in /in/5YHJH:3 Stack trace: #0 {main} thrown in /in/5YHJH on line 3
Process exited with code 255.

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