Description:
------------
php crashes during parsing INI file with function parse_ini_file() or parse_ini_string(). Both CLI and CGI versions are affected.

The crash occurs only if there is a section with integer name.

Test script:
---------------
<?php

$string=<<<__INI__
[9]



__INI__;

var_dump(parse_ini_string($string, TRUE, INI_SCANNER_TYPED));

Expected result:
----------------
Expected correct process termination.

Actual result:
--------------
PHP crashed:

                                                        Stack trace of thread 3685:
                                                        #0  0x0000559f487cd33f _zend_handle_numeric_str (php + 0x6e833f)
                                                        #1  0x0000559f4888d841 ini_parse (php + 0x7a8841)
                                                        #2  0x0000559f4888e289 zend_parse_ini_string (php + 0x7a9289)
                                                        #3  0x0000559f487cbc3e zif_parse_ini_string (php + 0x6e6c3e)
                                                        #4  0x0000559f489086eb ZEND_DO_ICALL_SPEC_RETVAL_USED_HANDLER (php + 0x8236eb)
                                                        #5  0x0000559f48907028 execute_ex (php + 0x822028)
                                                        #6  0x0000559f48954b45 zend_execute (php + 0x86fb45)
                                                        #7  0x0000559f488c49e4 zend_execute_scripts (php + 0x7df9e4)
                                                        #8  0x0000559f48859770 php_execute_script (php + 0x774770)
                                                        #9  0x0000559f48956ff8 do_cli (php + 0x871ff8)
                                                        #10 0x0000559f48715d1f main (php + 0x630d1f)
                                                        #11 0x00007f38d3f54e0b __libc_start_main (libc.so.6 + 0x26e0b)
                                                        #12 0x0000559f48715e1a _start (php + 0x630e1a)