PHP - Manual: IntlChar::isJavaIDStart
2024-12-22
(PHP 7, PHP 8)
IntlChar::isJavaIDStart — Check if code point is permissible as the first character in a Java identifier
$codepoint
): ?boolDetermines if the specified character is permissible as the start of a Java identifier.
In addition to IntlChar::isIDStart(), true
for characters with general categories "Sc" (currency symbols) and "Pc" (connecting punctuation).
codepoint
The int codepoint value (e.g. 0x2603
for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}"
)
Returns true
if
codepoint
may start a Java identifier, false
if not. Returns null
on failure.
示例 #1 Testing different code points
<?php
var_dump(IntlChar::isJavaIDStart("A"));
var_dump(IntlChar::isJavaIDStart("$"));
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)
官方地址:https://www.php.net/manual/en/intlchar.isjavaidstart.php