IntlChar::isIDStart
Check if code point is permissible as the first character in an identifier
Description
public static bool IntlChar::isIDStart
( mixed $codepoint
)
TRUE
for characters with general categories "L" (letters) and "Nl" (letter numbers).
Parameters
-
codepoint
-
The integer codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
Return Values
Returns TRUE
if
codepoint
may start an identifier, FALSE
if not.
Examples
Example #1 Testing different code points
<?php
var_dump(IntlChar::isIDStart("A"));
var_dump(IntlChar::isIDStart("$"));
var_dump(IntlChar::isIDStart("\n"));
var_dump(IntlChar::isIDStart("\u{2603}"));
?>
The above example will output:
bool(true)
bool(false)
bool(false)
bool(false)
See Also
- IntlChar::isalpha
- IntlChar::isIDPart
IntlChar::PROPERTY_ID_START