Tell Composer to Use Different PHP Version

How to specify to use a specific PHP version when running composer install?

There is more than one issue here.

First, you most likely don't really need to tell composer to use one interpreter or another. If you know that the platform requirements are going to be correct at runtime, but the runtime executable is not the same than the install executable, you can simply say:

composer install --ignore-platform-reqs

This way composer won't check that the runtime and extensions match what you declared on composer.json (but you'll need to make sure that these requirements are fulfilled on the server where the project actually runs).

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But if you really want to execute composer with a different runtime...

composer uses shebang + env to determine which PHP executable is going to use.

Basically it uses #!/usr/bin/env php to find which php executable is available, same as you were doing.

If you want to use a different executable, you just need to be explicit about it.

E.g. if your PHP 7.2 is installed at /usr/bin/php7.2 and composer at /usr/local/bin/composer, you just need to do:

# /usr/bin/php7.2 /usr/local/bin/composer install

How to switch php version when running composer?

IF you have multiple php version installed in your system

you can run composer with different versions like

In linux

PHP

    usr/local/php usr/bin/composer install

for PHP 7.1

usr/local/php7.1 /usr/local/composer install

actually the idea is which version you wants to run get its bin path and then run the composer.

In Windows.

path/to/php.exe composer install

Hope this helps

Tell composer which PHP version to use

Yes, you just have to specify which PHP version to use by directly calling the intended PHP bin file.

So, instead of

php composer.phar update

You have to use something like

/path/to/php5.6/bin/php composer.phar update

In my case, on a CentOS server with Plesk (default PHP version was 5.4, but I also had 5.6 and 7.0 installed), I had to use :

/opt/plesk/php/5.6/bin/php composer.phar update

Calling Composer With Specific PHP Version on Homestead

Run the command php70 and that will set PHP 7.0 to the default system version of PHP, then you can run composer normally.

How to switch between two different php version with composer

Create a Windows batch file that calls the composer.phar file using the php7 binary. Let's call the file composer7.bat:

@echo OFF
:: in case DelayedExpansion is on and a path contains ! 
setlocal DISABLEDELAYEDEXPANSION
c:\path\to\php7\directory\php.exe "%~dp0composer.phar" %*

Save the file along with the originally installed composer.bat file, mine is located in C:\ProgramData\ComposerSetup\bin\ directory.

Now call the php7 composer with the new command:

composer7 require ...

php version mismatch with composer

Your cli php version (the one you are using for your composer install) and the php version your apache is running in your server (the one you see in your phpinfo() page) might not match.

Try running this in your console:

$ php -v

This would output the version you are actually using when running your composer install

To run the same version in your server, you might need to locate the PHP 7 binary on your machine (maybe /usr/bin/php7.3, you could try to execute a $ whereis php), then:

/usr/bin/php7.3 /usr/local/bin/composer install

This was assuming that your composer binary is under /user/local/bin/composer, modify as need.

Composer uses wrong php version, but php -v shows the correct one (Ubuntu)

try this:

composer install --ignore-platform-reqs

or this in composer.json

"config": {
    "preferred-install": "dist",
    "platform": {
        "php": "7.0.0"
    }
}

in the second solution basically you're faking a platform, and run composer.phar update after this

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