ext/mbstring: Use internal_encoding INI setting instead of mb_internal_encoding() in tests (php#19663)

Moves the usage of `mb_internal_encoding()` to INI section for the tests not testing the encoding/function itself, but the other mbstring/iconv functions.

Author: jorgsowa

ext/mbstring/tests/bug54494.phpt

@@ -2,12 +2,11 @@
 Bug #54494: mb_substr() mishandles UTF-32LE and UCS-2LE
 --EXTENSIONS--
 mbstring
+--INI--
+internal_encoding=UTF-8
 --FILE--
 <?php
 
-//declare(encoding = 'UTF-8');
-mb_internal_encoding('UTF-8');
-
 header('Content-Type: text/plain; charset=UTF-32LE');
 
 $stringOr = "hällö wörld\n";

ext/mbstring/tests/bug65045.phpt

@@ -2,11 +2,11 @@
 Bug #65045: mb_convert_encoding breaks well-formed character
 --EXTENSIONS--
 mbstring
+--INI--
+internal_encoding=UTF-8
 --FILE--
 <?php
 
-mb_internal_encoding('UTF-8');
-
 $str = "\xF0\xA4\xAD".  "\xF0\xA4\xAD\xA2"."\xF0\xA4\xAD\xA2";
 $str2 = "\xF0\xA4\xAD\xA2"."\xF0\xA4\xAD\xA2"."\xF0\xA4\xAD";
 

ext/mbstring/tests/bug79441.phpt

@@ -2,10 +2,11 @@
 Bug #79441 Segfault in mb_chr() if internal encoding is unsupported
 --EXTENSIONS--
 mbstring
+--INI--
+internal_encoding=utf-7
 --FILE--
 <?php
 
-mb_internal_encoding("utf-7");
 try {
     mb_chr(0xd800);
 } catch (\ValueError $e) {

ext/mbstring/tests/gh7902.phpt

@@ -8,9 +8,9 @@ if (str_contains(getcwd(), " ")) die("skip sendmail_path ini with spaces");
 ?>
 --INI--
 sendmail_path={MAIL:{PWD}/gh7902.eml}
+internal_encoding=UTF-8
 --FILE--
 <?php
-mb_internal_encoding("UTF-8");
 mb_language("uni");
 $to = "[email protected]";
 $subject = "test mail";

ext/mbstring/tests/gh8086.phpt

@@ -3,11 +3,11 @@ GH-8086 (mb_send_mail() function not working correctly in PHP 8.x)
 --EXTENSIONS--
 mbstring
 --INI--
+internal_encoding=UTF-8
 sendmail_path={MAIL:{PWD}/gh8086.eml}
 mail.mixed_lf_and_crlf=on
 --FILE--
 <?php
-mb_internal_encoding("UTF-8");
 mb_language("uni");
 $to = "[email protected]";
 $subject = "test mail";

ext/mbstring/tests/mb_decode_mimeheader_basic.phpt

@@ -2,10 +2,11 @@
 Test mb_decode_mimeheader() function : basic functionality
 --EXTENSIONS--
 mbstring
+--INI--
+internal_encoding=utf-8
 --FILE--
 <?php
 echo "*** Testing mb_decode_mimeheader() : basic functionality ***\n";
-mb_internal_encoding('utf-8');
 
 //the following encoded-words are identical and are UTF-8 Japanese.
 $a = "=?UTF-8?b?5pel5pys6Kqe44OG44Kt44K544OI44Gn44GZ44CC?=";

ext/mbstring/tests/mb_decode_mimeheader_variation2.phpt

@@ -2,10 +2,11 @@
 Test mb_decode_mimeheader() function : variation
 --EXTENSIONS--
 mbstring
+--INI--
+internal_encoding=utf-8
 --FILE--
 <?php
 echo "*** Testing mb_decode_mimeheader() : variation ***\n";
-mb_internal_encoding('utf-8');
 
 //all the following are identical, we will convert to utf-8
 

ext/mbstring/tests/mb_decode_mimeheader_variation3.phpt

@@ -2,10 +2,11 @@
 Test mb_decode_mimeheader() function : variation
 --EXTENSIONS--
 mbstring
+--INI--
+internal_encoding=iso-8859-7
 --FILE--
 <?php
 echo "*** Testing mb_decode_mimeheader() : variation ***\n";
-mb_internal_encoding('iso-8859-7');
 
 //greek in UTF-8 to be converted to iso-8859-7
 $encoded_word = "=?UTF-8?B?zrHOss6zzrTOtc62zrfOuM65zrrOu868zr3Ovs6/z4DPgc+Dz4TPhc+Gz4fPiM+J?=";

ext/mbstring/tests/mb_encode_mimeheader_indent.phpt

@@ -2,6 +2,8 @@
 Test mb_encode_mimeheader() function : basic functionality, indent
 --EXTENSIONS--
 mbstring
+--INI--
+internal_encoding=utf-8
 --FILE--
 <?php
 /* (string $str [, string $charset [, string $transfer_encoding [, string $linefeed [, int $indent]]]])
@@ -15,8 +17,6 @@ mbstring
 
 echo "*** Testing mb_encode_mimeheader() : indent ***\n";
 
-mb_internal_encoding('utf-8');
-
 // Initialise function arguments not being substituted
 $str = base64_decode('zpHPhc+Ez4wgzrXOr869zrHOuSDOtc67zrvOt869zrnOus+MIM66zrXOr868zrXOvc6/LiAwMTIzNDU2Nzg5Lg==');
 $charset = 'utf-8';

ext/mbstring/tests/mb_encode_mimeheader_variation6.phpt

@@ -2,6 +2,8 @@
 Test mb_encode_mimeheader() function : usage variations - Pass different strings to $linefeed arg
 --EXTENSIONS--
 mbstring
+--INI--
+internal_encoding=utf-8
 --FILE--
 <?php
 /* (string $str [, string $charset [, string $transfer_encoding [, string $linefeed [, int $indent]]]])
@@ -15,8 +17,6 @@ mbstring
 
 echo "*** Testing mb_encode_mimeheader() : usage variations ***\n";
 
-mb_internal_encoding('utf-8');
-
 $linefeeds = array("\r\n",
                    "\n",
                    "---");