How do I install Composer using a script?

The following column composer usage tutorial will explain how to use scripts to install Composer. I hope it will be helpful to friends in need!

How do we programmatically install Composer?

As noted on the download page, this installer contains a signature, It changes when the installer code changes and should not be relied upon long-term.

There is another way, which is to use a script that only works for UNIX utilities:

#!/bin/sh
EXPECTED_SIGNATURE="$(wget -q -O - https://composer.github.io/installer.sig)"
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
ACTUAL_SIGNATURE="$(php -r "echo hash_file('SHA384', 'composer-setup.php');")"
if [ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]
then
    >&2 echo 'ERROR: Invalid installer signature'
    rm composer-setup.php
    exit 1
fi
php composer-setup.php --quiet
RESULT=$?
rm composer-setup.php
exit $RESULT

The script will exit and return 1 on failure, or 0 on success, if nothing is returned There is no error.

Alternatively, if you want to install using a copy of this installer, you can fetch a specific version from the GitHub history. If you trust the GitHub servers enough, committing the hash is enough to make it unique and authentic. For example:

wget https://raw.githubusercontent.com/composer/getcomposer.org/1b137f8bf6db3e79a38a5bc45324414a6b1f9df2/web/installer -O - -q | php -- --quiet

You can submit a hash that replaces any content based on the last commit:

https://github.com/composer/getcomposer.or...

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