Full and half-width conversion in php

// 半角数组 
$half = array(
   '0','1','2','3','4','5',
   '6','7','8','9','a','b',
   'c','d','e','f','g','h',
   'i','j','k','l','m','n',
   'o','p','q','r','s','t',
   'u','v','w','x','y','z',
   'A','B','C','D','E','F',
   'G','H','I','J','K','L',
   'M','N','O','P','Q','R',
   'S','T','U','V','W','X',
   'Y','Z','-','_','.','@',
   '?','?','?','?','?','?','?',
   '?','?','?','?','?','?','?',
   '?','?','?','?','?','?','?',
   '?','?','ネ','?','?','?','?',
   '?','?','?','?','ム','?','?',
   '?','?','?','?','?','?','?',
   '?','?','?'
 );
//全角数组
 $full = array(
   '０','１','２','３','４','５',
   '６','７','８','９','ａ','ｂ',
   'ｃ','ｄ','ｅ','ｆ','ｇ','ｈ',
   'ｉ','ｊ','ｋ','ｌ','ｍ','ｎ',
   'ｏ','ｐ','ｑ','ｒ','ｓ','ｔ',
   'ｕ','ｖ','ｗ','ｘ','ｙ','ｚ',
   'Ａ','Ｂ','Ｃ','Ｄ','Ｅ','Ｆ',
   'Ｇ','Ｈ','Ｉ','Ｊ','Ｋ','Ｌ',
   'Ｍ','Ｎ','Ｏ','Ｐ','Ｑ','Ｒ',
   'Ｓ','Ｔ','Ｕ','Ｖ','Ｗ','Ｘ',
   'Ｙ','Ｚ','－','＿','．','＠',
   'ア','イ','ウ','エ','オ','カ','キ',
   'ク','ケ','コ','サ','シ','ス','セ',
   'ソ','タ','チ','ツ','テ','ト','ナ',
   'ニ','ヌ','ネ','ノ','ハ','ヒ','フ',
   'ヘ','ホ','マ','ミ','ム','メ','モ',
   'ヤ','イ','ユ','エ','ヨ','ラ','リ',
   'ル','レ','ロ',
 );
  var_dump(str_replace($half, $full, '???')); // 半角转全角
  var_dump(str_replace($full,$half,'テスト')); // 全角转半角

The above introduces the full-width and half-width conversion in PHP, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.