Online PHP editor | refs for T1vk1

<?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", ); echo "++Invalid UTF-8 in pattern\n"; foreach ( $examples as $name => $str ) { echo "$name\n"; preg_match("/".$str."/u",'Testing'); } echo "++ preg_match() examples\n"; foreach ( $examples as $name => $str ) { preg_match("/\xf8\xa1\xa1\xa1\xa1/u", $str, $ar); echo "$name: "; if ( count($ar) == 0 ) { echo "Matched nothing!\n"; } else { echo "Matched {$ar[0]}\n"; } } echo "++ preg_match_all() examples\n"; foreach ( $examples as $name => $str ) { preg_match_all('/./u', $str, $ar); echo "$name: "; $num_utf8_chars = count($ar[0]); if ( $num_utf8_chars == 0 ) { echo "Matched nothing!\n"; } else { echo "Matched $num_utf8_chars character\n"; } }