php - convert emoji to their hex code -

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i'm trying detect emoji through e.g. post (the source ist not necessary).

as example i'm using emoji: ✊🏾 (i hope it's visible)

the code u+270a u+1f3fe (i'm using http://unicode.org/emoji/charts/full-emoji-list.html codes)

now converted emoji json_encode , get: \u270a\ud83c\udffe

here part equal 270a. \ud83c\udffe not equal u+1f3fe, not if add them (1b83a)

how ✊🏾 u+270a u+1f3fe e.g. php?

use mb_convert_encoding , convert utf-8 utf-32. additional formatting:

// strips leading zeros // , returns str in uppercase letters u+ prefix function format($str) {     $copy = false;     $len = strlen($str);     $res = '';      ($i = 0; $i < $len; ++$i) {         $ch = $str[$i];          if (!$copy) {             if ($ch != '0') {                 $copy = true;             }             // prevent format("0") returning ""             else if (($i + 1) == $len) {                 $res = '0';             }         }          if ($copy) {             $res .= $ch;         }     }      return 'u+'.strtoupper($res); }  function convert_emoji($emoji) {     // ✊🏾 --> 0000270a0001f3fe     $emoji = mb_convert_encoding($emoji, 'utf-32', 'utf-8');     $hex = bin2hex($emoji);      // split utf-32 hex representation chunks     $hex_len = strlen($hex) / 8;     $chunks = array();      ($i = 0; $i < $hex_len; ++$i) {         $tmp = substr($hex, $i * 8, 8);          // format each chunk         $chunks[$i] = format($tmp);     }      // convert chunks array string     return implode($chunks, ' '); }  echo convert_emoji('✊🏾'); // u+270a u+1f3fe

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