IntlChar::tolower

(PHP 7)

IntlChar::tolower — Make Unicode character lowercase

说明

public static mixed IntlChar::tolower ( mixed $codepoint )

The given character is mapped to its lowercase equivalent. If the character has no lowercase equivalent, the original character itself is returned.

参数

codepoint: The integer codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")

返回值

Returns the Simple_Lowercase_Mapping of the code point, if any; otherwise the code point itself.

The return type will be integer unless the code point was passed as a UTF-8 string , in which case a string will be returned.

范例

Example #1 Testing different code points

  <?php
var_dump ( IntlChar :: tolower ( "A" ));
 var_dump ( IntlChar :: tolower ( "a" ));
 var_dump ( IntlChar :: tolower ( "Φ" ));
 var_dump ( IntlChar :: tolower ( "φ" ));
 var_dump ( IntlChar :: tolower ( "1" ));
 var_dump ( IntlChar :: tolower ( ord ( "A" )));
 var_dump ( IntlChar :: tolower ( ord ( "a" )));
 ?>

以上例程会输出：

string(1) "a"
string(1) "a"
string(2) "φ"
string(2) "φ"
string(1) "1"
int(97)
int(97)

参见

IntlChar::totitle() - Make Unicode character titlecase
IntlChar::toupper() - Make Unicode character uppercase
mb_strtolower() - 使字符串小写