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(PHP 7, PHP 8)
IntlChar::getNumericValue — Get the numeric value for a Unicode code point
$codepoint): ?float
Gets the numeric value for a Unicode code point as defined in the Unicode Character Database.
For characters without any numeric values in the Unicode Character Database, this function will return
IntlChar::NO_NUMERIC_VALUE.
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}")
Numeric value of codepoint,
or IntlChar::NO_NUMERIC_VALUE if none is defined. This
constant was added in PHP 7.0.6, prior to this version the literal value
(float)-123456789 may be used instead. Returns null on failure.
示例 #1 Testing different code points
<?php
var_dump(IntlChar::getNumericValue("4"));
var_dump(IntlChar::getNumericValue("x"));
var_dump(IntlChar::getNumericValue("\u{216C}"));
?>
以上例程会输出：
float(4) float(-123456789) float(50)
