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run code in 150+ php & hhvm versions
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<?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 echo utf8(0x67); $strTest='holá'; for($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 5.6.8 - 5.6.28, 7.0.0 - 7.1.0
gcurrent char: h uniord= 104 prev dec= 103 prev hex= 67 prev char= C - current char: o uniord= 111 prev dec= 110 prev hex= 6e Notice: A non well formed numeric value encountered in /in/3cIDe on line 4 prev char=  - current char: l uniord= 108 prev dec= 107 prev hex= 6b Notice: A non well formed numeric value encountered in /in/3cIDe on line 4 prev char=  - current char: á uniord= 225 prev dec= 224 prev hex= e0 prev char= -
Output for hhvm-3.12.0
gcurrent char: h uniord= 104 prev dec= 103 prev hex= 67 prev char= C - current char: o uniord= 111 prev dec= 110 prev hex= 6e prev char=  - current char: l uniord= 108 prev dec= 107 prev hex= 6b prev char=  - current char: á uniord= 225 prev dec= 224 prev hex= e0 prev char= -
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.5.35
gcurrent char: h uniord= 104 prev dec= 103 prev hex= 67 prev char= C - current char: o uniord= 111 prev dec= 110 prev hex= 6e Notice: A non well formed numeric value encountered in /in/3cIDe on line 4 prev char=  - current char: l uniord= 108 prev dec= 107 prev hex= 6b Notice: A non well formed numeric value encountered in /in/3cIDe on line 4 prev char=  - current char: � Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 uniord= 64 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 prev dec= 63 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 prev hex= 3f Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: A non well formed numeric value encountered in /in/3cIDe on line 4 prev char=  - current char: � Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 uniord= Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev dec= -1 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev hex= ffffffffffffffff Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev char= -
Output for 5.2.10 - 5.2.17
gcurrent char: h uniord= 104 prev dec= 103 prev hex= 67 prev char= C - current char: o uniord= 111 prev dec= 110 prev hex= 6e prev char=  - current char: l uniord= 108 prev dec= 107 prev hex= 6b prev char=  - current char: � Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 uniord= 64 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 prev dec= 63 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 prev hex= 3f Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 prev char=  - current char: � Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 uniord= Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev dec= -1 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev hex= ffffffffffffffff Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev char= -
Output for 4.3.0 - 5.2.9
gcurrent char: h uniord= 104 prev dec= 103 prev hex= 67 prev char= C - current char: o uniord= 111 prev dec= 110 prev hex= 6e prev char=  - current char: l uniord= 108 prev dec= 107 prev hex= 6b prev char=  - current char: � Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 uniord= 64 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 prev dec= 63 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 prev hex= 3f Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 prev char=  - current char: � Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 uniord= Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev dec= -1 Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev hex= ffffffffffffffff Notice: Uninitialized string offset: 1 in /in/3cIDe on line 14 Notice: Uninitialized string offset: 2 in /in/3cIDe on line 15 Notice: Uninitialized string offset: 3 in /in/3cIDe on line 16 prev char= -