PHP | IntlChar::isxdigit() Function

The IntlChar::isxdigit() function is an inbuilt function in PHP which is used to check whether the given input character is a hexadecimal digit or not. It is TRUE for decimal digit numbers (0 – 9), Latin letters (a – f) and (A – F) in both ASCII and Fullwidth ASCII (Letters with codepoint \u{0041} to \u{0046}, \u{0061} to \u{0066}, \u{FF21} to \u{FF26} and \u{FF41} to \u{FF46}).

Syntax:

bool IntlChar::isxdigit( $codepoint )

Parameters: This function accepts a single parameter $codepoint which is mandatory. The input parameter is an integer values or character, which is encoded as a UTF-8 string.

Return Value: If $codepoint is a hexadecimal digit then it returns True, otherwise return False.

Below programs illustrate the IntlChar::isxdigit() function in PHP:

Program 1:

PHP

<?php
// PHP code to illustrate IntlChar::isxdigit()
// function

// Input data is digit type 0-9
var_dump(IntlChar::isxdigit("0"));
var_dump(IntlChar::isxdigit("9"));
var_dump(IntlChar::isxdigit("10"));

// Input data is character type
var_dump(IntlChar::isxdigit("A"));
var_dump(IntlChar::isxdigit("a"));
var_dump(IntlChar::isxdigit("F"));
var_dump(IntlChar::isxdigit("f"));
var_dump(IntlChar::isxdigit("G"));
var_dump(IntlChar::isxdigit("g"));

// Input data is FULL ASCII
var_dump(IntlChar::isxdigit("\u{0041}"));
var_dump(IntlChar::isxdigit("\u{0046}"));
var_dump(IntlChar::isxdigit("\u{0047}"));

?>

Output:

bool(true) 
bool(true) 
NULL 
bool(true) 
bool(true) 
bool(true) 
bool(true) 
bool(false) 
bool(false) 
bool(true) 
bool(true) 
bool(false) 

Program 2:

PHP

<?php
// PHP code to illustrate IntlChar::isxdigit()

// Declare an array $arr
$arr = array("0", "9", "a", "A", "f", "\u{0041}",
      "\u{0066}", "\u{0067}", "G", "10", "Geeks");

// Loop run for every array element
foreach ($arr as $val){

    // Check each element as code point data
    var_dump(IntlChar::isxdigit($val));
}
?>

Output:

bool(true) 
bool(true) 
bool(true) 
bool(true) 
bool(true) 
bool(true) 
bool(true) 
bool(false) 
bool(false) 
NULL 
NULL 

Note: IntlChar::isxdigit() is equivalent to IntlChar::digit($codepoint, 16) >= 0.

Reference: http://php.net/manual/en/intlchar.isxdigit.php