IntlChar::isJavaIDStart
Check if code point is permissible as the first character in a Java identifier
Description
public static boolnull IntlChar::isJavaIDStart(intstring $codepoint)
In addition to IntlChar::isIDStart, true for characters with general categories "Sc" (currency symbols) and "Pc" (connecting punctuation).
Parameters
-
codepoint
-
The int codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
Return Values
Returns true if
codepoint may start a Java identifier, false if not. Returns null on failure.
Examples
Example #1 Testing different code points
<?php
var_dump(IntlChar::isJavaIDStart("A"));
var_dump(IntlChar::isJavaIDStart("$"));
var_dump(IntlChar::isJavaIDStart("\n"));
var_dump(IntlChar::isJavaIDStart("\u{2603}"));
?>
The above example will output:
bool(true)
bool(true)
bool(false)
bool(false)
See Also
- IntlChar::isIDStart
- IntlChar::isJavaIDPart
- IntlChar::isalpha