javascript - PHP unicode char face convert to hex for Arabic -

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i experiencing problem in converting arabic chars hex values 

  $text = "يي";   $text = mb_convert_encoding($text, "html-entities", "utf-8");   $text = preg_replace('~^(&([a-za-z0-9]);)~',htmlentities('${1}'),$text);

result : 

يي

actually both chars ي in display changing faces according char position first, middle , end , want code //ﻳ == ي

            'beginning'     =>   'ﻳ',             'middle'        =>   'ﻴ',             'end'           =>   'ﻲ',             'isolated'      =>   'ﻱ'

i need char values face on screen in html, javascript or in php.

to fix shaping imagettftext, can use library ar-php:

  require('../i18n/arabic.php');    $arabic = new i18n_arabic('glyphs');      $text = 'بسم الله الرحمن الرحيم';    $text = $arabic->utf8glyphs($text);        imagettftext($im, 20, 0, 200,            100, $black, $font, $text);

full sample:

<?php    // set content-type    header("content-type: image/png");     // create image    $im = @imagecreatefromgif('gd/bg.gif');     // create colors    $black = imagecolorallocate($im, 0, 0, 0);    $blue  = imagecolorallocate($im, 0, 0, 255);    // replace own font     // full path , name    $local = $_server['script_filename'];    $pos   = strrpos($script, '/');    $path  = substr($script, 0, $pos);    $font  = $path.'/gd/ae_alhor.ttf';     // utf-8 charset    $text = 'بسم الله الرحمن الرحيم';     imagettftext($im, 20, 0, 10,                 50, $blue, $font, 'utf-8:');     imagettftext($im, 20, 0, 200,                 50, $black, $font, $text);     require('../i18n/arabic.php');    $arabic = new i18n_arabic('glyphs');     $text = 'بسم الله الرحمن الرحيم';    $text = $arabic->utf8glyphs($text);     imagettftext($im, 20, 0, 10,            100, $blue, $font, 'arglyphs:');     imagettftext($im, 20, 0, 200,            100, $black, $font, $text);     // using imagepng() results in clearer     // text compared imagejpeg()    imagepng($im);    imagedestroy($im);  ?>

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