PHP | IntlChar::isJavaIDStart() Function

Last Updated : 04 Nov, 2020

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

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