PHP | IntlChar::isJavaIDStart() Function

The IntlChar::isJavaIDStart() function is an inbuilt function in PHP which is used to check whether the input character code point is permissible since the first character is a java identifier or not. It is True for characters with general category “Sc” (Currency Symbols), and “Pc” (Connecting Punctuation).

Syntax:

bool IntlChar::isJavaIDStart( $codepoint )

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

Return Value: Returns True, if $codepoint start with Java identifier character, otherwise return False.

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

Program 1:

PHP

<?php
// PHP function to illustrate the
// use of IntlChar::isJavaIDStart()

// Input string codepoint value with
// Capital and small letter
var_dump(IntlChar::isJavaIDStart("R"));

// Input string codepoint value with small character
var_dump(IntlChar::isJavaIDStart("r"));

// Input control character codepoint value
var_dump(IntlChar::isJavaIDStart("\n"));

// Input string codepoint value
var_dump(IntlChar::isJavaIDStart("Bug"));

// Input int codepoint value
var_dump(IntlChar::isJavaIDStart("3 "));

// Input int char an identifier
// of codepoint value
var_dump(IntlChar::isJavaIDStart("\u{007F}"));

// Input symbolic codepoint value
var_dump(IntlChar::isJavaIDStart(" @ "));
var_dump(IntlChar::isJavaIDStart(" $ "));

?>

Output:

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

Program 2:

PHP

<?php
// PHP function to illustrate the
// use of IntlChar::isJavaIDStart()

// Declare an array with
// different codepoint value
$arr = array("C",
             " ",
             "\n",
             " #",
             "\t",
             "Code",
        );

// For loop condition to check
// each character through function
foreach ($arr as $val) {

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

Output:

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

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