Description:
------------
If the first argument of str_ireplace is shorter than the  
second one, the function crashes (segfault).  
 
diff php.ini-dist /etc/php/apache2-php5/php.ini 
79c79 
< short_open_tag = On 
--- 
> short_open_tag = Off 
410c410 
< ;default_charset = "iso-8859-1" 
--- 
> default_charset = "iso-8859-1" 
438c438 
< extension_dir = "./" 
--- 
> extension_dir 
= /usr/lib/php/extensions/no-debug-non-zts-20040316 
496c496,498 
< allow_url_fopen = On 
--- 
> ; allow_url_fopen = On 
> ; Closed for security - <robbat2@gentoo.org> 
> allow_url_fopen = Off 
534c536 
< ; extension_dir directive above. 
--- 
> ; extension_dir 
= /usr/lib/php/extensions/no-debug-non-zts-20040316 
879c881 
< session.cookie_lifetime = 0 
--- 
> session.cookie_lifetime = 1800 
 
 
The configure line from phpinfo(): 
'./configure' '--prefix=/usr' '--host=i686-pc-linux-gnu' 
'--mandir=/usr/share/man' '--infodir=/usr/share/info' 
'--datadir=/usr/share' '--sysconfdir=/etc' 
'--localstatedir=/var/lib' '--with-apxs2=/usr/sbin/apxs2' 
'--with-ndbm=/usr' '--with-db4=/usr' '--with-mcrypt=/usr' 
'--with-mhash=/usr' '--without-interbase' '--without-ming' 
'--without-swf' '--without-sybase' '--with-gdbm=/usr' 
'--without-fdftk' '--without-java' '--with-mcal=/usr' 
'--with-unixODBC=/usr' '--with-pgsql=/usr' 
'--without-snmp' '--with-pdflib=/usr' '--with-gd' 
'--enable-gd-native-ttf' '--with-png=/usr' 
'--with-png-dir=/usr' '--with-jpeg=/usr' 
'--with-jpeg-dir=/usr' '--enable-exif' '--with-tiff=/usr' 
'--with-tiff-dir=/usr' '--with-mysql=/usr' 
'--with-mysql-sock=/var/run/mysqld/mysqld.sock' 
'--with-freetype-dir=/usr' '--with-ttf=/usr' 
'--with-t1lib=/usr' '--with-gettext' '--without-qtdom' 
'--with-pspell=/usr' '--with-openssl=/usr' 
'--with-imap=/usr' '--with-ldap=/usr' '--with-dom=/usr' 
'--with-dom-xslt=/usr' '--with-dom-exslt=/usr' 
'--with-kerberos=/usr' '--with-pam' 
'--disable-memory-limit' '--disable-ipv6' '--without-yaz' 
'--without-curl' '--enable-dbx' '--with-imap-ssl' 
'--with-zlib=/usr' '--with-zlib-dir=/usr' 
'--with-sablot=/usr' '--enable-xslt' '--with-xslt-sablot' 
'--with-xmlrpc' '--enable-wddx' '--with-xml' 
'--enable-mbstring=all' '--enable-mbregex' 
'--with-bz2=/usr' '--with-crack=/usr' '--with-cdb' 
'--enable-pcntl' '--enable-bcmath' '--enable-calendar' 
'--enable-dbase' '--enable-filepro' '--enable-ftp' 
'--with-mime-magic=/usr/share/misc/file/magic.mime' 
'--enable-sockets' '--enable-sysvsem' '--enable-sysvshm' 
'--enable-sysvipc' '--with-iconv' '--enable-shmop' 
'--enable-dio' '--enable-yp' '--without-ncurses' 
'--without-readline' '--enable-inline-optimization' 
'--enable-track-vars' '--enable-trans-sid' 
'--enable-versioning' 
'--with-config-file-path=/etc/php/apache2-php5'  

Reproduce code:
---------------
echo(str_ireplace('es','q','test'));


Expected result:
----------------
output should be: 
tqt 

Actual result:
--------------
An error occurred while loading http://..../test.php: 
Connection to host ... is broken 
 
In Apache2 error log I get following: 
[Thu Apr 08 19:20:43 2004] [notice] child pid 636 exit 
signal Segmentation fault (11)