Description:
------------
Although I can't trace it down exactly, something in the last day or so has caused PHP 5 HEAD to crash when using Smarty. Here is the backtrace:

#0  0x4201c207 in utf8_internal_loop_single () from /lib/i686/libc.so.6
#1  0x4201a89a in __gconv_transform_utf8_internal () from /lib/i686/libc.so.6
#2  0x42082a22 in mbrtowc () from /lib/i686/libc.so.6
#3  0x402ba8d4 in php_basename (s=0x80e2bd4 "index.tpl", len=9, suffix=0x0, 
    sufflen=0, p_ret=0xbfffad94, p_len=0xbfffad98, tsrm_ls=0x80de480)
    at /usr/include/wchar.h:320
#4  0x402baa36 in zif_basename (ht=1, return_value=0x80e81b4, this_ptr=0x0, 
    return_value_used=1, tsrm_ls=0x80de480)
    at /home/john/working/php-src/ext/standard/string.c:1149
#5  0x403436ba in zend_do_fcall_common_helper (execute_data=0xbfffb6b0, 
    opline=0x40b88a48, op_array=0x40baf6cc, tsrm_ls=0x80de480)
    at /home/john/working/php-src/Zend/zend_execute.c:2558
#6  0x40343867 in zend_do_fcall_handler (execute_data=0xbfffb6b0, 
    opline=0x40b88a48, op_array=0x40baf6cc, tsrm_ls=0x80de480)
    at /home/john/working/php-src/Zend/zend_execute.c:2700
#7  0x4033fb09 in execute (op_array=0x40baf6cc, tsrm_ls=0x80de480)
    at /home/john/working/php-src/Zend/zend_execute.c:1272
#8  0x4034342a in zend_do_fcall_common_helper (execute_data=0xbfffb830, 
    opline=0x8119c48, op_array=0x40baeb0c, tsrm_ls=0x80de480)
    at /home/john/working/php-src/Zend/zend_execute.c:2587
#9  0x4034378d in zend_do_fcall_by_name_handler (execute_data=0x656d616e, 
    opline=0x8119c48, op_array=0x40baeb0c, tsrm_ls=0x80de480)
    at /home/john/working/php-src/Zend/zend_execute.c:2669


It appears the recent UTF8 Changes have broken php_basename()