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<?php $examples = array( 'Valid ASCII' => "a", 'Valid 2 Octet Sequence' => "\xc3\xb1", 'Invalid 2 Octet Sequence' => "\xc3\x28", 'Invalid Sequence Identifier' => "\xa0\xa1", 'Valid 3 Octet Sequence' => "\xe2\x82\xa1", 'Invalid 3 Octet Sequence (in 2nd Octet)' => "\xe2\x28\xa1", 'Invalid 3 Octet Sequence (in 3rd Octet)' => "\xe2\x82\x28", 'Valid 4 Octet Sequence' => "\xf0\x90\x8c\xbc", 'Invalid 4 Octet Sequence (in 2nd Octet)' => "\xf0\x28\x8c\xbc", 'Invalid 4 Octet Sequence (in 3rd Octet)' => "\xf0\x90\x28\xbc", 'Invalid 4 Octet Sequence (in 4th Octet)' => "\xf0\x28\x8c\x28", 'Valid 5 Octet Sequence (but not Unicode!)' => "\xf8\xa1\xa1\xa1\xa1", 'Valid 6 Octet Sequence (but not Unicode!)' => "\xfc\xa1\xa1\xa1\xa1\xa1", ); foreach ($examples as $k => $v) { echo $k . PHP_EOL; echo var_dump((bool)preg_match('//u', $v)); }
Output for git.master, git.master_jit, rfc.property-hooks
Valid ASCII bool(true) Valid 2 Octet Sequence bool(true) Invalid 2 Octet Sequence bool(false) Invalid Sequence Identifier bool(false) Valid 3 Octet Sequence bool(true) Invalid 3 Octet Sequence (in 2nd Octet) bool(false) Invalid 3 Octet Sequence (in 3rd Octet) bool(false) Valid 4 Octet Sequence bool(true) Invalid 4 Octet Sequence (in 2nd Octet) bool(false) Invalid 4 Octet Sequence (in 3rd Octet) bool(false) Invalid 4 Octet Sequence (in 4th Octet) bool(false) Valid 5 Octet Sequence (but not Unicode!) bool(false) Valid 6 Octet Sequence (but not Unicode!) bool(false)

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