Online PHP editor | refs for oP3Ve

<?php $examples = array( 'Valid ASCII' => array("a", true), 'Valid 2 Octet Sequence' => array("\xc3\xb1", true), 'Invalid 2 Octet Sequence' => array("\xc3\x28", false), 'Invalid Sequence Identifier' => array("\xa0\xa1", false), 'Valid 3 Octet Sequence' => array("\xe2\x82\xa1", true), 'Invalid 3 Octet Sequence (in 2nd Octet)' => array("\xe2\x28\xa1", false), 'Invalid 3 Octet Sequence (in 3rd Octet)' => array("\xe2\x82\x28", false), 'Valid 4 Octet Sequence' => array("\xf0\x90\x8c\xbc", true), 'Invalid 4 Octet Sequence (in 2nd Octet)' => array("\xf0\x28\x8c\xbc", false), 'Invalid 4 Octet Sequence (in 3rd Octet)' => array("\xf0\x90\x28\xbc", false), 'Invalid 4 Octet Sequence (in 4th Octet)' => array("\xf0\x28\x8c\x28", false), 'Valid 5 Octet Sequence (but not Unicode!)' => array("\xf8\xa1\xa1\xa1\xa1", false), 'Valid 6 Octet Sequence (but not Unicode!)' => array("\xfc\xa1\xa1\xa1\xa1\xa1", false), ); function checkWithPreg($str) { return preg_match('//u', $str); } function checkWithMbstring($str) { return mb_check_encoding($str, 'UTF-8'); } function test($actual, $expected, $title) { echo $actual == $expected ? "[Success]" : "[Fail]"; echo " $title\n"; } function runTests($method) { global $examples; foreach($examples as $title => $arr) { list($str, $bool) = $arr; test($method($str), $bool, $title); } } echo "Checking with PCRE u modifier\n"; runTests('checkWithPreg'); echo "\n"; echo "Checking with mb_check_encoding\n"; runTests('checkWithMbstring');