PHP IntlChar charDirection()函数用法介绍

IntlChar::charDirection()function是PHP中的内置函数, 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。

语法如下：

int IntlChar::charDirection ( $codepoint )

参数：该函数接受单个参数$ codepoint这是强制性的。的$ codepoint值是整数值或字符, 被编码为UTF-8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

下面的程序说明了IntlChar :: charDirection()PHP中的功能：

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);
?>

输出如下：

bool(true)
bool(true)
bool(true)
bool(true)
bool(false)
bool(false)
bool(true)

程式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" ));
?>

输出如下：

int(0)
int(1)
int(3)
int(6)
NULL
int(0)
int(0)

相关文章：

• PHP | IntlChar :: islower()函数
• PHP | IntlChar :: iscntrl()函数

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

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