(PHP 7)
IntlChar::isIDStart — Check if code point is permissible as the first character in an identifier
public static IntlChar::isIDStart ( mixed $codepoint ) : bool
Determines if the specified character is permissible as the first character in an identifier according to Unicode (The Unicode Standard, Version 3.0, chapter 5.16 Identifiers).
true
for characters with general categories "L" (letters) and "Nl" (letter numbers).
codepoint
The int codepoint value (e.g. 0x2603
for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}"
)
Returns true
if codepoint
may start an identifier, false
if not.
Example #1 Testing different code points
<?php var_dump(IntlChar::isIDStart("A")); var_dump(IntlChar::isIDStart("$")); var_dump(IntlChar::isIDStart("\n")); var_dump(IntlChar::isIDStart("\u{2603}")); ?>
The above example will output:
bool(true) bool(false) bool(false) bool(false)
IntlChar::PROPERTY_ID_START
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https://www.php.net/manual/en/intlchar.isidstart.php