最近有客戶的discuz論壇，因為需使用特殊 api ，所以需要升級使用 php 5.4 ，
但升級後，發現有相容於 php 5.4 的問題，所以我們又著手協助處理。
discuz php5.4的問題，根據discuz論壇提供的資料 http://www.discuz.net/thread-3095848-1-1.html
原來是 discuz 本身的程式碼，只有相容於 ISO-8859-1 ，所以php 5.3 之前的版本都沒有問題，php 5.4 則是使用 utf8 ，則會因此導致使用到ISO-8859-1編碼的功能出錯。
都沒發現 php souce 的路逕，導致無法修改 html.c 。
但這是已經 compile 過的，所以去修改 html.c ，也不會產生效果。
The build output should start shortly…!! Local template detected: /var/cpanel/templates/apache2/vhost.local !!!! Local template detected: /var/cpanel/templates/apache2/ssl_vhost.local !!!!
If there are issues with your local templates you might be interested in setting the ‘When there are problems with local templates and the default templates are tried, move the local one to a .broken extension.’ preference. !!Distilled successfully
!! Verbose logfile is at ‘/usr/local/cpanel/logs/easy/apache/build.1415086948’ !!
!!
Output from ‘/bin/sh -c “ulimit -a”‘:
core file size (blocks, -c) 1048576
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 127421
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 127421
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
!!
!! Creating backup of working apache in ‘/usr/local/apache.backup’. !!
!! Symlink encountered (/usr/local/apache/etc), preserving target (conf)… !!!! Backup of working apache complete. !!
Checking that all tarballs are present and up to date.
Checking that all packages are present and up to date.
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
* base: mirror.hmc.edu
* extras: linux.mirrors.es.net
* rpmforge: mirror.hmc.edu
* updates: mirrors.usc.edu
Setting up Install Process
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Package gettext-0.17-18.el6.x86_64 already installed and latest version
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Package openssl-1.0.1e-30.el6_6.2.x86_64 already installed and latest version
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Package zlib-devel-1.2.3-29.el6.x86_64 already installed and latest version
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Package libidn-devel-1.18-2.el6.x86_64 already installed and latest version
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Package libidn-1.18-2.el6.x86_64 already installed and latest version
Package libXpm-3.5.10-2.el6.x86_64 already installed and latest version
Package openssl-devel-1.0.1e-30.el6_6.2.x86_64 already installed and latest version
Package automake-1.11.1-4.el6.noarch already installed and latest version
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Package pam-devel-1.1.1-20.el6.x86_64 already installed and latest version
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No package libopenssl0.9.7-devel available.
Package e2fsprogs-devel-1.41.12-21.el6.x86_64 already installed and latest version
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Nothing to do
!! Processing RPMs… !!
— Begin opt ‘Deflate’ —
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— Begin opt ‘Mod FastCGI v2.3.9’ —
— Begin dryrun test ‘Store FCGID working directory’ —
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— Begin dryrun test ‘Patch mod_fcgid’ —
Patch tested at -p1; ../mod_fcgid_patches/0001-only_signal_running.patch
Applying patch; ../mod_fcgid_patches/0001-only_signal_running.patch
patching file modules/fcgid/fcgid_proc_unix.c
Hunk #1 succeeded at 417 (offset -5 lines).
— End dryrun test ‘Patch mod_fcgid’ —
— Begin step ‘Create task list to do after apache is built’ —
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— End opt ‘Mod FastCGI v2.3.9’ —
— Begin opt ‘Fileprotect’ —
— Begin dryrun test ‘turning it on…’ —
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— Begin step ‘Run /usr/local/cpanel/scripts/enablefileprotect after Apache is installed’ —
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— End opt ‘Fileprotect’ —
— Begin opt ‘Headers’ —
— Begin step ‘to config options’ —
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— Begin opt ‘MPM Prefork’ —
— Begin step ‘to config options’ —
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— Begin opt ‘MemCache’ —
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— Begin opt ‘Proxy’ —
— Begin step ‘Adding –enable-proxy to Apache configure line’ —
— End step ‘Adding –enable-proxy to Apache configure line’ —
— End opt ‘Proxy’ —
— Begin opt ‘UniqueId’ —
— Begin step ‘Applying EasyApache patches’ —
Patch tested at -p1; /home/cpeasyapache/src/cppatch/0001-Provided-a-fallback-for-mod_unique_id-when-hostname-.patch
Applying patch; /home/cpeasyapache/src/cppatch/0001-Provided-a-fallback-for-mod_unique_id-when-hostname-.patch
patching file modules/metadata/mod_unique_id.c
— End step ‘Applying EasyApache patches’ —
— Begin step ‘to config options’ —
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— End opt ‘UniqueId’ —
— Begin opt ‘Apache 2.2’ —
— Begin dryrun test ‘Applying patches if any’ —
Patch tested at -p1; ../cppatch/2.2.6-ssl_engine_rand.patch
Applying patch; ../cppatch/2.2.6-ssl_engine_rand.patch
patching file modules/ssl/ssl_engine_rand.c
Patch tested at -p1; ../cppatch/2.2.8_ssl_scache_dbm.patch
Applying patch; ../cppatch/2.2.8_ssl_scache_dbm.p
4. 掃了一下log，看到的確也有擺放 source template 的位置，大約是在 /var/cpanel/ ，
但不太確定，只好在多看幾行， 又看到 ../cppatch，在 locate cppatch 真實的路逕，
在去vim 數個xxx.path ， 看到了在 /var/cpanel/perl/easy/Cpanel/Easy/PHP5/ 。
5. cd /var/cpanel/perl/easy/Cpanel/Easy/PHP5 後，在仔細看一下資料夾內的資料， 發現了 4_34.pm.tar.gz ，解開這個壓縮檔， ext/standard/html.c 果然躲在這裡，
修改完，在使用 easyapache compile ….. finish 。
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以上是透過主機的解法。 另快也可以透過修改程式去解決(比較能一勞永逸)
1. php的官方網站，也有列出這樣的問題，以及大約要修改的語法:
http://php.net/manual/en/function.htmlspecialchars.php
2. php 官方真是相當地體貼， 把內容及除錯的方式都寫的很清楚(也就是強制讓語法使用
ISO-8859-1) ：
As of PHP 5.4 they changed default encoding from “ISO-8859-1” to “UTF-8”. So if you get null from htmlspecialchars or htmlentities
where you have only set
<?php
echo htmlspecialchars($string);
echo htmlentities($string);
?>
you can fix it by
<?php
echo htmlspecialchars($string, ENT_COMPAT,‘ISO-8859-1’, true);
echo htmlentities($string, ENT_COMPAT,‘ISO-8859-1’, true);
?>
3. 在linux 底下，用 grep 就可以快速找出有問題的地方:
On linux you can find the scripts you need to fix by
grep -Rl “htmlspecialchars\\|htmlentities” /path/to/php/scripts/
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以上是我們的處理心得，希望也能解決你的問題!!