(PHP 7)
IntlChar::getNumericValue — Get the numeric value for a Unicode code point
public static IntlChar::getNumericValue ( mixed $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. 
Example #1 Testing different code points
<?php
var_dump(IntlChar::getNumericValue("4"));
var_dump(IntlChar::getNumericValue("x"));
var_dump(IntlChar::getNumericValue("\u{216C}"));
?> The above example will output:
float(4) float(-123456789) float(50)
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    https://www.php.net/manual/en/intlchar.getnumericvalue.php