PHP string processing full-width half-width conversion, PHP string full-width half-width _php tutorial

PHP string processing full-width half-width conversion, PHP string full-width half angle

Half-angle full-width processing is a common problem in string processing, this paper attempts to provide a way for everyone.

First, the concept

Full-width character Unicode encoding from 65281~65374 (hex 0xff01 ~ 0xff5e)
Half-width character Unicode encoding from 33~126 (hex 0x21~ 0x7E)
Space is special, full angle is 12288 (0x3000), half angle is (0x20)
And in addition to empty, the full-width/half-width of Unicode-encoded sorting is corresponding in order
So you can deal with non-whitespace data directly by using +---to handle the whitespace separately.

Second, the realization of ideas

1. Find the character of the target Unicode, you can use regular expressions to resolve

2. Modifying Unicode encoding

Third, the realization

1. The first is the two Unicode and character conversion functions:

1     /**2 * Convert Unicode to characters3 * @param int $unicode4 * @return string UTF-8 characters5      **/6     functionUnicode2char ($unicode){7         if($unicode< 128)return CHR($unicode);8         if($unicode< 2048)return CHR(($unicode>> 6) + 192).9                                       CHR(($unicode& 63) + 128);Ten         if($unicode< 65536)return CHR(($unicode>> 12) + 224). One                                       CHR((($unicode>> 6) & 63) + 128). A                                       CHR(($unicode& 63) + 128); -         if($unicode< 2097152)return CHR(($unicode>> 18) + 240). -                                       CHR((($unicode>>) & 63) + 128). the                                       CHR((($unicode>> 6) & 63) + 128). -                                       CHR(($unicode& 63) + 128); -         return false; -     } +   -     /** + * Convert characters to Unicode A * @param string $char must be a UTF-8 character at * @return int -      **/ -     functionChar2unicode ($char){ -         Switch(strlen($char)){ -              Case1:return Ord($char); -              Case2:return(Ord($char{1}) & 63) | in((Ord($char{0}) & << 6); -              Case5 |return(Ord($char{2}) & 63) | to((Ord($char{1}) & << 6) | +((Ord($char{0}) & << 12); -              Case4:return(Ord($char{3}) & 63) | the((Ord($char{2}) & << 6) | *((Ord($char{1}) & << 12) | $((Ord($char{0}) & 7) << 18);Panax Notoginseng             default: -                 Trigger_error(' Character is not utf-8! ',e_user_warning); the                 return false; +         } A}

2. Full-width turning half angle

1     /* * 2      * Full-width turn half angle 3     * @param string $str  4     * @return string  5       **/  6     function sbc2dbc ($str) { 7         return Preg_replace (  8             //  9             '/[\x{3000}\x{ff01}-\x{ff5f}]/ue ',+             //  code conversion  One             //0x3000 is a space, special processing, other full-width character encoding -0xfee0 can be converted to half-width              ($unicode =char2unicode (\ ' \0\ ')) = = 0x3000? "": (($code = $unicode -0xfee0) > 256? Unicode2char ($code): Chr ($code)) ',             $str        ];      }

3. Half angle turning full angle

  1  /*   *   2   * Half width turn full angle   3  * @param string $str   4   * @return string   5   *  */  6   function  dbc2sbc ( $str  ) {  7   return   preg_replace   (  8  //  Half-width character   9  '/[\x{0020}\x{0020 }-\x{7e}]/ue ',  ten  //  encoding conversion   one  //0x0020 is empty Lattice, special processing, other half-width character encoding +0xfee0 can be converted to full-width    ' ($unicode =char2unicode (\ ' \0\ ')) = = 0x0020?             Unicode2char (0x3000): (($code = $unicode +0xfee0) > Unicode2char ($code): Chr ($code)) ',    $str    );   } 

Iv. Testing

Example code:

1 $a = ' abc12 345 '; 2 $SBC = DBC2SBC ($a); 3 $dbc = Sbc2dbc ($sbc); 4 5 Var_dump ($a$sbc$dbc);

Results:

1 string (9) "ABC12 345"2string"Abc12 345"3string(9) "ABC12 345"

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