In the Symfony\Component\Process\PhpExecutableFinder the last check is using the constant PHP_BINDIR. It passes this as $extraDirs to the Symfony\Component\Process\ExecutableFinder which is fine so far. The problem is that Symfony\Component\Process\ExecutableFinder first searches in the PATH environment variable and then as second try in the $extraDirs. If you have multiple php versions installed on one system (or if you are using rh-php70 from RHEL software collections) the ExecutableFinder then may find the binary /usr/bin/php while the current used binary is for example /opt/rh/rh-php70/root/usr/bin/php.