IntlChar::isJavaIDStart

(PHP 7)

IntlChar::isJavaIDStart — Check if code point is permissible as the first character in a Java identifier

说明

public static bool IntlChar::isJavaIDStart ( mixed $codepoint )

Determines if the specified character is permissible as the start of a Java identifier.

In addition to IntlChar::isIDStart() , TRUE for characters with general categories "Sc" (currency symbols) and "Pc" (connecting punctuation).

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 TRUE if codepoint may start a Java identifier, FALSE if not.

范例

Example #1 Testing different code points

  <?php
var_dump ( IntlChar :: isJavaIDStart ( "A" ));
 var_dump ( IntlChar :: isJavaIDStart ( "$" ));
 var_dump ( IntlChar :: isJavaIDStart ( "\n" ));
 var_dump ( IntlChar :: isJavaIDStart ( "\u{2603}" ));
 ?>

以上例程会输出：

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

参见

IntlChar::isIDStart() - Check if code point is permissible as the first character in an identifier
IntlChar::isJavaIDPart() - Check if code point is permissible in a Java identifier
IntlChar::isalpha() - Check if code point is a letter character