svn move only moves one file at a time. Your best bet is a shell loop. In Bash, try
for f in *.php ; do svn mv $f php-folder/; done
On Windows, that's
for %f in (*.php) do svn mv %f php-folder/
Edit: Starting with Subversion 1.5, svn mv
accepts multiple source files, so your original command would work. The shell loop is only needed for svn 1.4.x and earlier. (Of course, the shell loop will still work with 1.5; it just isn't necessary.)
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