arch-wiki-md-repo/wiki/_content/english/PHP pthreads extension.md

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If you wish to have POSIX multi-threading you will need the pthreads extension. To install the pthreads ([http://pecl.php.net/package/pthreads](http://pecl.php.net/package/pthreads)) extension using `pecl` you are required to use a compiled version of PHP with the the thread safety support flag `--enable-maintainer-zts`. currently the most clean way to do this would be to rebuild the original package with the proper flag.

Check what packages depend on the [php](https://www.archlinux.org/packages/?name=php) package, for example:

 `pacman -Qii php` 
```
:: php-apache: requires php
:: php-apcu: requires php
:: php-mcrypt: requires php
:: php-pear: requires php
:: php-pgsql: requires php

```

Remove all of them including 'php', for example:

 `pacman -R php php-apache php-apcu php-mcrypt php-pear php-pgsql` 

Clone Archlinux's official package repository

```
cd /opt/
git clone [git://projects.archlinux.org/svntogit/packages.git](git://projects.archlinux.org/svntogit/packages.git)
cd packages/php/repos/extra-x86_64

```

Make the changes to add threads support

 `vim PKGBUILD` 

Should look something like

```
...
--with-xsl=shared \
--with-zlib \
--enable-maintainer-zts
...

```

Make the new packages

 `makepkg -s` 

Install the packages you removed

```
pacman -U \
php-5.5.8-1-x86_64.pkg.tar.xz \
php-apache-5.5.8-1-x86_64.pkg.tar.xz \
php-mcrypt-5.5.8-1-x86_64.pkg.tar.xz \
php-pear-5.5.8-1-x86_64.pkg.tar.xz \
php-pgsql-5.5.8-1-x86_64.pkg.tar.xz

```

Install pthreads

 `pecl install pthreads` 

### Install the 'apcu' package for APC support back

```
cd ../../../php-apcu/repos/extra-x86_64/
makepkg -si

```