En essyant d'installer composer, le gestionnaire de dépendance de php sur une Debian Wheezy avec PHP 5.5, j'ai eu le message d'erreur suivant :
root@myserver:/var/www# curl -sS https://getcomposer.org/installer | php All settings correct for using Composer PHP Warning: file_get_contents(): Unable to set verify locations `/etc/ssl/certs/ca-certificates.crt' `(null)' in - on line 770 Warning: file_get_contents(): Unable to set verify locations `/etc/ssl/certs/ca-certificates.crt' `(null)' in - on line 770 PHP Warning: file_get_contents(): failed to create an SSL handle in - on line 770 Warning: file_get_contents(): failed to create an SSL handle in - on line 770 PHP Warning: file_get_contents(): Failed to enable crypto in - on line 770 Warning: file_get_contents(): Failed to enable crypto in - on line 770 PHP Warning: file_get_contents(https://getcomposer.org/versions): failed to open stream: operation failed in - on line 770 Warning: file_get_contents(https://getcomposer.org/versions): failed to open stream: operation failed in - on line 770 PHP Warning: Invalid argument supplied for foreach() in - on line 516 Warning: Invalid argument supplied for foreach() in - on line 516 None of the 0 stable version(s) of Composer matches your PHP version (5.5.38-1~dotdeb+7.1 / ID: 50538)
La solution à ce problème se trouve dans ce post : https://github.com/composer/composer/issues/2798 :
L'idée est de remplacer le certificat par un qui fonctionne :
wget http://curl.haxx.se/ca/cacert.pem cp /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt.old mv cacert.pem /etc/ssl/certs/ca-certificates.crt
Ensuite, on peut lancer l'install de composer :
curl -sS https://getcomposer.org/installer | php -- --cafile=cacert.pem