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[2001-11-30 13:40 UTC] bajolet at toiletoine dot net
Summary :
A function works well on php 4.0.5 and enters an infinite loop on php 4.0.6.
Function entering in infinite loop :
The purpose of this function is to parse a template containing some tags, line by line, and replace them by values contained in the $t_strings array.
The input can be :
<td bgcolor="#FFCC00" colspan="2"><phpdig:previous_link src='./tpl_img/left.gif'/><phpdig:pages_bar/><phpdig:next_link src='./tpl_img/right.gif'/></td>
i think the str_replace() function don't replace anything ; the while statment stays always true, etc...
function parse_phpdig_tags($line,$t_strings)
{
while(eregi('<phpdig:([a-z0-9_]*)[[:blank:]]*(src=)*["\']*([a-z0-9./_-]+)*["\']*[[:blank:]]*/>',$line,$regs))
{
//links with images
if ($regs[2])
{
if ($regs[3] && $t_strings[$regs[1]])
{
if (ereg('^http',$t_strings[$regs[1]]))
$target = ' target="_blank"';
else
$target = '';
$replacement = '<A href="'.$t_strings[$regs[1]].'"'.$target.'><img src="'.$regs[3].'" border="0" align="bottom"></a>';
}
else
{
$replacement = '';
}
$line = str_replace($regs[0],$replacement,$line);
}
else
{
$line = str_replace($regs[0],$t_strings[$regs[1]],$line);
}
}
return $line;
}
Configuration not working (php 4.0.6) :
'../configure' '--prefix=/usr' '--prefix=/usr' '--with-regex=system' '--enable-force-cgi-redirect' '--with-config-file-path=/etc/php4/cgi' '--disable-rpath' '--disable-pear' '--enable-memory-limit' '--enable-calendar' '--enable-bcmath' '--with-bz2' '--enable-ctype' '--with-db2' '--with-ndbm' '--enable-exif' '--enable-filepro' '--with-gettext' '--enable-track-vars' '--enable-trans-sid' '--disable-debug' '--disable-static' '--with-mm' '--with-pcre-regex=/usr' '--enable-shmop' '--enable-sockets' '--with-xml=/usr' '--with-expat-dir=/usr' '--with-zlib' '--enable-email' '--disable-posix' '--without-mysql' '--without-sybase-ct'
Configuration working (php 4.0.5) :
'./configure' '--with-apxs=/usr/local/apache/bin/apxs' '--with-pgsql=/usr/local/pgsql' '--with-ldap' '--with-openssl' '--with-domxml' '--with-bcmath' '--enable-track-vars' '--with-gd=../gd-1.8.4' '--enable-freetype-4bit-antialias-hack' '--with-mysql' '--with-jpeg-dir=../jpeg-6b' '--with-png-dir=../libpng-1.0.12' '--with-freetype-dir=../freetype-2.0.4' '--with-zlib-dir=../zlib' '--with-sablot=SHARED' '--enable-bcmath' '--enable-ftp' '--enable-sockets' '--enable-magic-quotes' '--enable-versioning'
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Last updated: Tue Oct 28 21:00:01 2025 UTC |
Please reduce this to a simpler test case. If there is a bug in str_replace, then it should be reproduceable with a simple one line test. Logging how the str_replace functions are called should let you find the culprit. A line like this after the function calls are made should do the trick. error_log ("$line = str_replace({$regs[0]},$replacement,$line);\n", 3, './str_rep_log'); Good Luck!I isolate the bug : this works : eregi('<phpdig:([a-z0-9_]*)[[:blank:]]*(src=)*["\']*([a-z0-9./_-]+)*["\']*[[:blank:]]*/>','<br><i><phpdig:ignore_message/></i></td>',$regs); this doesn't (php loops) : eregi('<phpdig:([a-z0-9_]*)[[:blank:]]*(src=)*["\']*([a-z0-9./_-]+)*["\']*[[:blank:]]*/>','<br><i><phpdig:ignore_common_message/></i></td>',$regs);Thanks for the additional information. I tested the code snippets provided on PHP 4.1.0 - they all seem to operate as expected. The input of both snippets (when fed to your original function) returns '<br><i></i></td>' The regular expressions provided later seem to work as well. The top snippet captures: array(10) { [0]=> string(24) "<phpdig:ignore_message/>" [1]=> string(14) "ignore_message" [2]=> bool(false) [3]=> bool(false) [4]=> bool(false) [5]=> bool(false) [6]=> bool(false) [7]=> bool(false) [8]=> bool(false) [9]=> bool(false) } ...and the bottom snippet captures: array(10) { [0]=> string(31) "<phpdig:ignore_common_message/>" [1]=> string(21) "ignore_common_message" [2]=> bool(false) [3]=> bool(false) [4]=> bool(false) [5]=> bool(false) [6]=> bool(false) [7]=> bool(false) [8]=> bool(false) [9]=> bool(false) } Is this the output that you get with PHP 4.0.6? Please let me know!The problem is there... I got the first result : >array(10) { > [0]=> > string(24) "<phpdig:ignore_message/>" > [1]=> > string(14) "ignore_message" > [2]=> > ... But on the second, i got nothing but a 'maximum execution time exceeded'. I traced my code with some echoes and flush(), and it seems that the php engine stays on the eregi() function. It not core dump, but Apache goes 100% CPU until the timeout occurs.