bug symfony#61766 Fix ord()-related PHP 8.5 deprecations (nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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 Fix ord()-related PHP 8.5 deprecations

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

The remaining deprecations will be fixed by doctrine/orm#12160

Commits
-------

5314fd5 Fix ord()-related PHP 8.5 deprecations

Author: nicolas-grekas

src/Symfony/Component/HttpFoundation/BinaryFileResponse.php

@@ -163,7 +163,7 @@ public function setContentDisposition(string $disposition, string $filename = ''
             for ($i = 0, $filenameLength = mb_strlen($filename, $encoding); $i < $filenameLength; ++$i) {
                 $char = mb_substr($filename, $i, 1, $encoding);
 
-                if ('%' === $char || \ord($char) < 32 || \ord($char) > 126) {
+                if ('%' === $char || \ord($char[0]) < 32 || \ord($char[0]) > 126) {
                     $filenameFallback .= '_';
                 } else {
                     $filenameFallback .= $char;

src/Symfony/Component/Mime/Encoder/QpContentEncoder.php

@@ -46,9 +46,9 @@ private function standardize(string $string): string
         // transform =0D=0A to CRLF
         $string = str_replace(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string);
 
-        return match (\ord(substr($string, -1))) {
-            0x09 => substr_replace($string, '=09', -1),
-            0x20 => substr_replace($string, '=20', -1),
+        return match ($string[-1] ?? '') {
+            "\x09" => substr_replace($string, '=09', -1),
+            "\x20" => substr_replace($string, '=20', -1),
             default => $string,
         };
     }

src/Symfony/Component/Mime/Encoder/QpEncoder.php

@@ -183,9 +183,9 @@ private function standardize(string $string): string
     {
         $string = str_replace(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string);
 
-        return match ($end = \ord(substr($string, -1))) {
-            0x09,
-            0x20 => substr_replace($string, self::QP_MAP[$end], -1),
+        return match ($end = ($string[-1] ?? '')) {
+            "\x09",
+            "\x20" => substr_replace($string, self::QP_MAP[\ord($end)], -1),
             default => $string,
         };
     }