Easy Brew PHP version switching (Now moved to https://github.com/rhukster/sphp.sh)

sphp.sh

#!/bin/bash
# Creator: Phil Cook
# Modified: Andy Miller
#
# >>> IMPORTANT: Moved to: https://github.com/rhukster/sphp.sh
# >>> Kept here for legacy purposes
#
osx_major_version=$(sw_vers -productVersion | cut -d. -f1)
osx_minor_version=$(sw_vers -productVersion | cut -d. -f2)
osx_patch_version=$(sw_vers -productVersion | cut -d. -f3)
osx_patch_version=${osx_patch_version:-0}
osx_version=$((${osx_major_version} * 10000 + ${osx_minor_version} * 100 + ${osx_patch_version}))
homebrew_path=$(brew --prefix)
brew_prefix=$(brew --prefix | sed 's#/#\\\/#g')

brew_array=("5.6","7.0","7.1","7.2","7.3","7.4","8.0","8.1","8.2")
php_array=("php@5.6" "php@7.0" "php@7.1" "php@7.2" "php@7.3" "php@7.4" "php@8.0" "php@8.1" "php@8.2")
php_installed_array=()
php_version="php@$1"
php_opt_path="$brew_prefix\/opt\/"

php5_module="php5_module"
apache_php5_lib_path="\/lib\/httpd\/modules\/libphp5.so"
php7_module="php7_module"
apache_php7_lib_path="\/lib\/httpd\/modules\/libphp7.so"
php8_module="php_module"
apache_php8_lib_path="\/lib\/httpd\/modules\/libphp.so"

native_osx_php_apache_module="LoadModule ${php5_module} libexec\/apache2\/libphp5.so"
if [ "${osx_version}" -ge "101300" ]; then
    native_osx_php_apache_module="LoadModule ${php7_module} libexec\/apache2\/libphp7.so"
fi

# Has the user submitted a version required
if [[ -z "$1" ]]; then
    echo "usage: sphp version [-s|-s=*] [-c=*]"
    echo
    echo "    version    one of:" ${brew_array[@]}
    echo
    exit
fi

php_module="$php5_module"
apache_php_lib_path="$apache_php5_lib_path"

simple_php_version=$(echo "$php_version" | sed 's/^php@//' | sed 's/\.//')
if [[ simple_php_version -ge 70 && simple_php_version -lt 80 ]]; then
    php_module="$php7_module"
    apache_php_lib_path="$apache_php7_lib_path"
elif [[ simple_php_version -ge 80 ]]; then  
    php_module="$php8_module"
    apache_php_lib_path="$apache_php8_lib_path"
fi

apache_change=1
apache_conf_path="$homebrew_path/etc/httpd/httpd.conf"
apache_php_mod_path="$php_opt_path$php_version$apache_php_lib_path"

# What versions of php are installed via brew
for i in ${php_array[*]}; do
    version=$(echo "$i" | sed 's/^php@//')
    if [[ -d "$homebrew_path/etc/php/$version" ]]; then
        php_installed_array+=("$i")
    fi
done

# Check that the requested version is supported
if [[ " ${php_array[*]} " == *"$php_version"* ]]; then
    # Check that the requested version is installed
    if [[ " ${php_installed_array[*]} " == *"$php_version"* ]]; then

        # Switch Shell
        echo "Switching to $php_version"
        echo "Switching your shell"
        for i in ${php_installed_array[@]}; do
            brew unlink $i
        done
        brew link --force "$php_version"

        # Switch apache
        if [[ $apache_change -eq 1 ]]; then
            echo "Switching your apache conf"

            for j in ${php_installed_array[@]}; do
                loop_php_module="$php5_module"
                loop_apache_php_lib_path="$apache_php5_lib_path"
                loop_php_version=$(echo "$j" | sed 's/^php@//' | sed 's/\.//')
                if [[ loop_php_version -ge 70 && loop_php_version -lt 80 ]]; then
                    loop_php_module="$php7_module"
                    loop_apache_php_lib_path="$apache_php7_lib_path"
                elif [[ loop_php_version -ge 80 ]]; then  
                    loop_php_module="$php8_module"
                    loop_apache_php_lib_path="$apache_php8_lib_path" 
                fi
                apache_module_string="LoadModule $loop_php_module $php_opt_path$j$loop_apache_php_lib_path"
                comment_apache_module_string="#$apache_module_string"

                # If apache module string within apache conf
                if grep -q "$apache_module_string" "$apache_conf_path"; then
                    # If apache module string not commented out already
                    if ! grep -q "$comment_apache_module_string" "$apache_conf_path"; then
                        sed -i.bak "s/$apache_module_string/$comment_apache_module_string/g" $apache_conf_path
                    fi
                # Else the string for the php module is not in the apache config then add it
                else
                    sed -i.bak "/$native_osx_php_apache_module/a\\
$comment_apache_module_string\\
" $apache_conf_path
                fi
            done
            sed -i.bak "s/\#LoadModule $php_module $apache_php_mod_path/LoadModule $php_module $apache_php_mod_path/g" $apache_conf_path
            echo "Restarting apache"
            brew services stop httpd
            brew services start httpd
        fi

	echo ""
        php -v
        echo ""

        echo "All done!"
    else
        echo "Sorry, but $php_version is not installed via brew. Install by running: brew install $php_version"
    fi
else
    echo "Unknown version of PHP. PHP Switcher can only handle arguments of:" ${brew_array[@]}
fi

I'm using GNU grep as default instead of MacOS's version of it, and since it was upgraded to 3.8, sphp started throwing warnings (8 per installed php version):

grep: warning: stray \ before /

I understand that the backslash is required as the regex is also used for sed, so I'm not quite sure how best to fix this. As a workaround I've modified sphp to call /usr/bin/grep.

@dregad, in addition to that change, I would remove the unnecessary escapes in the variable values altogether, and then do localized replacements for the sed calls by using something like ${apache_php_mod_path//\//\\\/} (the general form is ${VAR//PATTERN/REPLACE}).

Using the full path for every non-built-in command creates predictability in the script and reduces inconsistencies between user machines.

To help with consistency and to reduce maintenance, small wrapper functions can be written inside the script for each non-built-in. For example:

grep() {
  /usr/bin/grep "$@"
}

Then grep can be used without a path or backslash prefix in the rest of the script.

I would also run the script through ShellCheck and shfmt.

If anyone wants to rewrite the script and optimize it, I will gladly test it!

@rhukster thanks for considering this as a permanent change to sphp script.

Since Gists do not allow pull requests, how would you like to receive contributions ? Is a simple comment here with a patch OK, or would you prefer to get the changes from a fork of the Gist ?

I might just move this to a full repo. Overkill for one file generally but in these situations PRs and issues would be helpful.

Let me do that today.

@rhukster just wondering if you ever got around to creating a repo for this script to allow contributions via pull requests. If so, a link would be nice as I didn't find it.

Dang forgot all about it.. going to create that repo now.

@rhukster just wondering if you ever got around to creating a repo for this script to allow contributions via pull requests. If so, a link would be nice as I didn't find it.

Here it is: https://github.com/rhukster/sphp.sh

Thanks @rhukster. FYI you forgot to update a link in your blog article, PHP Switcher Script in the paragraph after the subtitle still points to Gist.

cheers, will update that too.