Manual developer-side svn pre-commit hook. Put it inside your .bashrc and use "svnci -m 'some message' somefile anotherfile" instead of usual "svn ci -m 'some message' somefile anotherfile". All arguments for 'svnci' will be carefully redirected to actual 'svn ci' call. The function will 'rise error' if your diff contains var_dump or other debug…

svn_check_debug.sh

svnci() { 
    greprc=$(svn diff | grep -wc -E '(echo|var_dump|print_r|var_export)')

    if [[ $greprc == 1 ]] ; then
        echo '###############################'
        echo '### WARNING! DEBUG DETECTED ###'
        echo '###############################'
        svn diff | grep -E '(echo|var_dump|print_r|var_export|\+\+\+)'    
    else
        if [[ $greprc == 0 ]] ; then                
            args=''
            # carefully save quoted arguments (for example, commit message)
            whitespace="[[:space:]]"
            for i in "$@"
            do
                if [[ $i =~ $whitespace ]]
                then
                    i=\"$i\"
                fi
                args="$args $i"            
            done
            
            cmd="svn ci $args"
            eval $cmd
            
        else
            echo Some sort of error
        fi
    fi
}