IntlChar::isJavaIDStart
(PHP 7, PHP 8)
IntlChar::isJavaIDStart — Check if code point is permissible as the first character in a Java identifier
Description
public static IntlChar::isJavaIDStart(int|string
$codepoint): ?boolDetermines if the specified character is permissible as the start of a Java identifier.
In addition to IntlChar::isIDStart(), true for characters with general categories "Sc" (currency symbols) and "Pc" (connecting punctuation).
Parameters
-
codepoint -
The int codepoint value (e.g.
0x2603for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g."\u")
Return Values
Returns true if
codepoint may start a Java identifier, false if not. Returns null on failure.
Examples
Example #1 Testing different code points
<?php
var_dump(IntlChar::isJavaIDStart("A"));
var_dump(IntlChar::isJavaIDStart("$"));
var_dump(IntlChar::isJavaIDStart("\n"));
var_dump(IntlChar::isJavaIDStart("\u"));
?>
The above example will output:
bool(true) bool(true) bool(false) bool(false)
See Also
- 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
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