PHP for full-width character conversion to half-width method Summary, full-width half-width _php tutorial

PHP implements full-width character conversion to half-width method Summary, full-width half-width

The simplest way

<?php  $str = "0123abcdfws\",.? <> {}[]*&^%#@! ~ () +-|:; ";  echo "$str";  echo "
";  $str = Preg_replace ('/\xa3 ([\xa1-\xfe])/E ', ' Chr (Ord (\1) -0x80) ', $str);  Echo $str;

This is the online code, all the Chinese punctuation of the second byte minus 0x80 (that is, 128) the number is the half-width of the figure. The/E mode expresses: If this modifier is set, Preg_replace () makes a normal substitution of the inverse reference in the replacement string, evaluates it as a PHP code, and replaces the searched string with its result.

This function is feasible in non-UTF-8 mode, but this method seems to be invalid under UTF-8.

Method Two:

$queue = Array (' 0 ' = ' 0 ', ' 1 ' = ' 1 ', ' 2 ' = ' 2 ', ' 3 ' = ' 3 ', ' 4 ' = ' 4 ', ' 5 ' = ' + ' 5 ', ' 6 ' = ' 6 ' and ' 7 ' ' = ' + ' 7 ', ' 8 ' = ' 8 ', ' 9 ' = ' 9 ', ' A ' and ' a ', ' B ' = ' B ', ' c ' = ' C ', ' d ', ' = ' d ', ' e ' = ' e ', ' F ' = ' F ', ' g ' = ' g ', ' h ' = = ' h ', ' i ' = = ' I ', ' j ' = ' j ', ' k ' = ' k ', ' l ' = ', ' l ', ' m ' = ' + ', ' n ' =& Gt ' N ', ' o ' = ' o ', ' p ' = = ' P ', ' q ' + = ' q ', ' r ' = = ' R ', ' s ' + ' s ', ' t ' = ' t ', ' u ' = ' = ', ' V '  ', ' w ' = ' W ', ' x ' = ' x ', ' y ' = ' y ', ' z ' = ', ' z ', ' a ' = = ' A ', ' b ' = = ' B ', ' c ' = ' C ', ' d ' and '-d ', ' E ' = ' e ', ' f ' = ' f ', ' g ' = = ' g ', ' h ' = = ' h ', ' i ' = ' I ', ' j ' = ' j ', ' k ' = ' k ', ' l ' = ' l ', '  M ' = = ' m ', ' n ' = ' n ', ' o ' = = ' o ', ' p ' = = ' P ', ' q ' + = ' q ', ' r ' + = ' r ', ' s ' + = ' s ', ' t ' = ' t ', ' u ' = = ' U ', ' v ' = = ' V ', ' w ' = = ' W ', ' x ' + ' x ', ' y ' = ' y ', ' z ' = ' = ' z '); echo preg_replace_callback ([\xef ][\xbc][\x90-\x99]| [\XEF][\XBD][\X81-\X9A\XA1-\XBA])/", ' Next_fchar ', ' 0 '), function Next_fchar ($matches) {global $queue; return $queue [$ MATCHES[1]];}

Method Three:

/*** string Half-width and full-width conversion * @param string $str strings to be converted * @param int $type TODBC: Convert to Half-width, TOSBC, convert to full-width * @return string returns the converted string */funct        Ion Convertstrtype ($STR, $type) {$dbc = 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 ', '-', ', ': ', '. ' , '，' , '／' , '％' , '＃' , '！ ', ' @ ', ' & ', ' (', ') ', ' ' ', ' ', ' ', ', ', '?    ', ' [', '] ', ' {', '} ', ' \ ', ' | ', ' + ', ' = ', ' _ ', ' ^ ', ' ￥ ', ' ￣ ', '); $SBC = Array (//half-width ' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' D ', ' E ', ' F ', ' G ', ' H ', ' I ', ' J ', ' K ', ' L ',' M ', ' N ', ' O ', ' P ', ' Q ', ' R ', ' S ', ' T ', ' U ', ' V ', ' W ', ' X ', ' Y ', ' Z ', ' A ', ' B ', ' C ', ' d ', ' e ', ' F ' , ' g ', ' h ', ' I ', ' j ', ' K ', ' l ', ' m ', ' n ', ' o ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' u ', ' V ', ' w ', ' x ', ' Y ', '      Z ', '-', ', ': ', ', ', ', ', ', ', ', ', '/', '% ', ' # ', '! ', ' @ ', ' & ', ' (', ') ', ' < ', ' > ', ' ', ' ', '? ', ' [', '] ', ' {', '} ', ' \ \ ', ' | ', ' + ', ' = ', ' _ ', ' ^ ', ' ￥ ', ' ~ ', '), if ($type = = ' Todbc ') {return str_replace ($SB C, $dbc, $STR); Half-width to full-width}elseif ($type = = ' TOSBC ') {return str_replace ($DBC, $SBC, $STR),//full-width to half-width}else{return $str;}}

Method Four:

/*** converts a string containing full-width numeric characters, letters, spaces, or '%+-() ' characters to the corresponding half-width character * * @access public* @param string $str the string to be converted * * @return string $str processed string */fun Ction Make_semiangle ($str) {$arr = array (' 0 ' = ' 0 ', ' 1 ' = = ' 1 ', ' 2 ' = ' 2 ', ' 3 ' = ' 3 ', ' 4 ' = ' 4 ', ' 5 '-- ; ' 5 ', ' 6 ' = ' 6 ', ' 7 ' = ' 7 ', ' 8 ' = ' 8 ', ' 9 ' = ' 9 ', ' a ' = ' a ', ' b ' = ' ' B ', ' c ' = ' C ', ' d ' = ' = ' d ' , ' e ' = ' e ', ' f ' = ' f ', ' g ' = = ' g ', ' h ' = = ' h ', ' i ' = = ' I ', ' j ' = ' j ', ' K ' + ' k ', ' l ' = ' = ', ' m ' = ' + ' M ', ' n ' = ' n ', ' o ' = = ' o ', ' p ' = ' P ', ' q ' = ' Q ', ' R ' + ' R ', ' s ' and ' s ', ' t ' and ' t ', ' U ' =& Gt ' U ', ' V ' = ' V ', ' w ' = = ' W ', ' x ' = ' x ', ' y ' = ' y ', ' z ' = ' = ', ' a ' = = ' A ', ' b ' = = ' B ', ' c ' = ' C ' , ' d ' = ' d ', ' e ' = ' e ', ' f ' = = ' f ', ' g ' = = ' g ', ' h ' = = ' h ', ' i ' = = ' I ', ' j ' = ' j ', ' k ' = ' k ', ' l ' + ' l ', ' m ' = = ' m ', ' n ' = = ' n ', ' o ' = = ' o ', ' p ' = ' P ', ' Q ' + ' q ', ' r ' = = ' R ', ' s ' = ' s ', ' t ' =& Gt ' t ', ' u ' = =' U ', ' V ' = ' V ', ' w ' = = ' W ', ' x ' = ' x ', ' y ' = ' y ', ' z ' = ' = ', ' (' = ' = ' (') ', ' ' = ') ', ' (' = ' = ' [',  ' = ' + '] ', ' ' ' ' + ' [', ' ' ' ' + '] ', ' ' ' + ' [', ' ' ' + '] ', ' ' ' ' + ' [', ' ' ' ' = '] ', ' ' ' = = '] ', ' {' = = ' {', '} ' + '} ', ' ' = ' < ', ' ' = ' > ', '% ' = '% ', ' + ' + ' + ', '-' = '-', ' -' + '-', ' ~ ' = '-', ': ' = ': ', '. ' = = ', ', ', ' = = ', ', ', ' = ', ', ', ' = ', ', '; ' = ', ', '? ' = = '? ', '! ' = = '! ' = '-'-', ' ‖ ' and ' | ', ' ' ' ' ' and ' ' ' ', ' ' + ' ', ' ' ' + ' ', ' | ' + ' | ' Gt "); return Strtr ($str, $arr);}

The difference between full angle and half angle (from Chinese Wikipedia)

Full-width, also known as full-shape, full-width, is a form of computer characters that literally mean characters that are wider than ordinary characters (or half-width characters).

Traditionally, the English or Latin alphabet language uses a byte of space to store, and kanji, Japanese, etc. often use two bytes of storage, in the use of fixed-width text place, in order to make the font look neat, English letters, numbers and other symbols, but also by the original only occupy a word space, instead of occupying two words of space to display, and use two bytes to store it.

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