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PHP | IntlChar::isIDStart() Function

The IntlChar::isIDStart() function is an inbuilt function in PHP which is used to check whether the given input character code point is permissible since the first character is an identifier or not. It is True for characters with general category “L” (Letters), and “Nl” (letters numbers).

Syntax:

bool IntlChar::isIDStart( $codepoint )

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

Return Value: If $codepoint start with an identifier character then returns True, otherwise return False.

Below programs illustrate the IntlChar::isIDStart() Function in PHP:



Program 1:

<?php
// PHP code to illustrate
// IntlChar::isIDStart() function
   
// Input character codepoint value 
var_dump(IntlChar::isIDStart("G"));
echo "<br>";
  
// Input string codepoint value 
var_dump(IntlChar::isIDStart("Geeks"));
echo "<br>";
   
// Input int codepoint value 
var_dump(IntlChar::isIDStart("3 "));
echo "<br>";
  
// Input floating codepoint value 
var_dump(IntlChar::isIDStart("2025.6003"));
echo "<br>";
   
// Input int char an identifier
// of codepoint value
var_dump(IntlChar::isIDStart("u{007F}"));
echo "<br>";
var_dump(IntlChar::isIDStart("u{012C}"));
echo "<br>";
  
// Input symbolic codepoint value 
var_dump(IntlChar::isIDStart(" $ "));
echo "<br>";
?>

Output:

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

Program 2:

<?php
// PHP code to illustrate
// IntlChar::isIStart() function
// Declare an array with
// different codepoint value 
$arr = array("h"
             "H",
             ".",
             "999"
             " ",
             " ",
             "u{007F}"
        );
   
// For loop condition to check 
// each character through function
foreach ($arr as $val) {
       
    // Check each element as code point data
    var_dump(IntlChar::isIDStart($val));
    echo "<br>";
}
?>

Output:

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

Related Articles:

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



This article is attributed to GeeksforGeeks.org

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