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run code in 150+ php & hhvm versions
Bugs & Features
<?php function utf8($num) { if($num<=0x7F) return chr($num); if($num<=0x7FF) return chr(($num>>6)+192).chr(($num&63)+128); if($num<=0xFFFF) return chr(($num>>12)+224).chr((($num>>6)&63)+128).chr(($num&63)+128); if($num<=0x1FFFFF) return chr(($num>>18)+240).chr((($num>>12)&63)+128).chr((($num>>6)&63)+128).chr(($num&63)+128); return ''; } function uniord($c) { $ord0 = ord($c{0}); if ($ord0>=0 && $ord0<=127) return $ord0; $ord1 = ord($c{1}); if ($ord0>=192 && $ord0<=223) return ($ord0-192)*64 + ($ord1-128); $ord2 = ord($c{2}); if ($ord0>=224 && $ord0<=239) return ($ord0-224)*4096 + ($ord1-128)*64 + ($ord2-128); $ord3 = ord($c{3}); if ($ord0>=240 && $ord0<=247) return ($ord0-240)*262144 + ($ord1-128)*4096 + ($ord2-128)*64 + ($ord3-128); return false; } //echo uniord('á'); 225 //echo utf8(0xE1); á $strTest='holá'; for($i = 0, $n = mb_strlen($strTest); $i < $n; $i++) { $mbchar = mb_substr($strTest, $i, 1); echo 'current char: '.$mbchar.' '; echo 'uniord= '.uniord($mbchar).' '; echo 'prev dec= '.uniord($mbchar)-1.' '; echo 'prev hex= '.dechex(uniord($mbchar)-1).' '; echo 'prev char= '.utf8(dechex(uniord($mbchar)-1)).' - '; }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.29
Parse error: syntax error, unexpected '' '' (T_CONSTANT_ENCAPSED_STRING), expecting ',' or ';' in /in/ZKmFH on line 26
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ',' or ';' in /in/ZKmFH on line 26
Process exited with code 255.