Simple script that checks if all characters of a given string are supported by OTF / TTF font and outputs the findings in a simple HTML table.

supported_chars.php

<?php
/**
 * Checks if all characters of a given string are supported by OTF file
 * Outputs the findings in a simple HTML table
 * 
 * Needs: php-font-lib @ https://github.com/PhenX/php-font-lib
 */
 
require_once "../src/FontLib/Autoloader.php";

/**
 * Convert a string into an array of decimal Unicode code points.
 *
 * @param $string   [string] The string to convert to codepoints
 * @param $encoding [string] The encoding of $string
 * 
 * @return [array] Array of decimal codepoints for every character of $string
 */
function toCodePoint( $string, $encoding )
{
    $utf32  = mb_convert_encoding( $string, 'UTF-32', $encoding );
    $length = mb_strlen( $utf32, 'UTF-32' );
    $result = [];

    for( $i = 0; $i < $length; ++$i )
	{
        $result[] = hexdec( bin2hex( mb_substr( $utf32, $i, 1, 'UTF-32' ) ) );
	}

    return $result;
}

$text = "エンタメMAP部データチーム";
$textCPs = toCodePoint($text, 'UTF-8');

$font = \FontLib\Font::load('NotoSans-Regular.ttf');
$charMap = $font->getUnicodeCharMap();

echo '
	<table>
		<tr>
			<th>Char</th>
			<th>Code Point</th>
			<th>Supported</th>
		</tr>
';
for ($i = 0; $i < mb_strlen($text); $i++)
{
	$char = mb_substr($text, $i, 1);
	$cp = $textCPs[$i];
	$supported = array_key_exists($cp, $charMap)
		? true
		: false;
	
	echo '<tr>';	
	echo '<td>' . $char . '</td>';
	echo '<td>' . $cp . '</td>';
	echo '<td>' . var_export($supported, true) . '</td>';
	echo '</tr>';
}
echo '</table>';

?>