PHP | IntlChar::isJavaIDStart() Function
Last Updated :
11 Jul, 2025
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
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Reference: https://www.php.net/manual/en/intlchar.isjavaidstart.php