MD5 checksum in PHP and BASH

I wondered why the same word has different MD5 checksum if I use the PHP md5(-) method and BASH md5sum command. What I mean is:

<?php echo md5("sol"); ?>

The result is:

12313a3d28f802e3a22b07d2e01c6dcf

$ echo "sol"|md5sum

The result is:

56717d999058f0e053d4b580c9396a92

It’s so because the echo command – by default – adds a newline character after its execution, so it really creates a MD5 checksum of:  ‘sol\n’. To avoid it, you can use the -n echo switch which disables the trailing newline character for this command.

$ echo -n "sol"|md5sum

The result is now:

12313a3d28f802e3a22b07d2e01c6dcf which is what it should be in the first place :-)