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PHP IntlChar charDirection()用法及代码示例


IntlChar::charDirection()函数是PHP中的一个内置函数，用于获取代码点的双向类别值。它返回代码点的双向类别值，该值在Unicode双向算法中使用。

用法:

int IntlChar::charDirection ( $codepoint )

参数：该函数接受单个参数$codepoint，该参数是必需的。 $codepoint值是整数值或字符，被编码为UTF-8字符串。


返回值：此函数返回双向类别值，如下所示：

  • IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT
  • IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT
  • IntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER
  • IntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER_SEPARATOR
  • IntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER_TERMINATOR
  • IntlChar::CHAR_DIRECTION_ARABIC_NUMBER
  • IntlChar::CHAR_DIRECTION_COMMON_NUMBER_SEPARATOR
  • IntlChar::CHAR_DIRECTION_BLOCK_SEPARATOR
  • IntlChar::CHAR_DIRECTION_SEGMENT_SEPARATOR
  • IntlChar::CHAR_DIRECTION_WHITE_SPACE_NEUTRAL
  • IntlChar::CHAR_DIRECTION_OTHER_NEUTRAL
  • IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_EMBEDDING
  • IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_OVERRIDE
  • IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_ARABIC
  • IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_EMBEDDING
  • IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_OVERRIDE
  • IntlChar::CHAR_DIRECTION_POP_DIRECTIONAL_FORMAT
  • IntlChar::CHAR_DIRECTION_DIR_NON_SPACING_MARK
  • IntlChar::CHAR_DIRECTION_BOUNDARY_NEUTRAL
  • IntlChar::CHAR_DIRECTION_FIRST_STRONG_ISOLATE
  • IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT_ISOLATE
  • IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT_ISOLATE
  • IntlChar::CHAR_DIRECTION_POP_DIRECTIONAL_ISOLATE
  • IntlChar::CHAR_DIRECTION_CHAR_DIRECTION_COUNT

以下示例程序旨在说明PHP中的IntlChar::charDirection()函数：

程序1:

<?php 
  
// PHP code to illustrate IntlChar::charDirection() 
// function 
  
// Input data is character type 
var_dump(IntlChar::charDirection("A") ===  
           IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT); 
  
// Input data is unicode character 
var_dump(IntlChar::charDirection("\u{05E9}") ===  
           IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT); 
  
// Input data is character type 
var_dump(IntlChar::charDirection("+") ===  
IntlChar::CHAR_DIRECTION_EUROPEAN_NUMBER_SEPARATOR); 
  
// Input data is character type 
var_dump(IntlChar::charDirection(".") ===  
  IntlChar::CHAR_DIRECTION_COMMON_NUMBER_SEPARATOR); 
  
// Input data is string type 
var_dump(IntlChar::charDirection("ABC") ===  
            IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT); 
  
// Input data is character type 
var_dump(IntlChar::charDirection("c") ===  
            IntlChar::CHAR_DIRECTION_RIGHT_TO_LEFT); 
  
// Input data is character type 
var_dump(IntlChar::charDirection("O") ===  
            IntlChar::CHAR_DIRECTION_LEFT_TO_RIGHT); 
?>
输出： 
bool(true)
bool(true)
bool(true)
bool(true)
bool(false)
bool(false)
bool(true)

程序2:

<?php 
  
// PHP code to illustrate IntlChar::charDirection() 
// function 
  
// Input data is character type 
var_dump(IntlChar::charDirection("A")); 
  
// Input data is unicode character 
var_dump(IntlChar::charDirection("\u{05E9}")); 
  
// Input data is character type 
var_dump(IntlChar::charDirection("+")); 
  
// Input data is character type 
var_dump(IntlChar::charDirection(".")); 
  
// Input data is string type 
var_dump(IntlChar::charDirection("ABC")); 
  
// Input data is character type 
var_dump(IntlChar::charDirection("c")); 
  
// Input data is character type 
var_dump(IntlChar::charDirection("O")); 
?>
输出： 
int(0)
int(1)
int(3)
int(6)
NULL
int(0)
int(0)

相关文章：

参考： http://php.net/manual/en/intlchar.chardirection.php



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注：本文由纯净天空筛选整理自Mahadev99大神的英文原创作品 PHP | IntlChar charDirection() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。