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(PHP 7, PHP 8)
IntlChar::isJavaIDStart — Check if code point is permissible as the first character in a Java identifier
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).
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}"));
?>
以上示例会输出:
bool(true) bool(true) bool(false) bool(false)