|
|
Posted by Edward Vermillion on 06/17/05 20:45
On Jun 17, 2005, at 9:18 AM, Bob Winter wrote:
>
>
> nntp.charter.net wrote:
>> I want to write a trace procedure and call it with variable names,
>> and I am having trouble with the syntax. My goal is to have a
>> procedure that will echo lines such as:
>> Trace: $myvar="the contents of $myvar
>> My attempt that didn't work is to write a function:
>> function my_trace($m){
>> echo ("\n<br>TRACE: $m = ");
>> eval("\$t=\"$m\";");
>> echo($t."<br>\n");
>> }
>> and call it with statements like:
>> my_trace("\$my_var");
>> my_trace("\$_ENV[\"COMPUTERNAME\"]");
>> What am I doing wrong, and how should this be done? Also, should I
>> post to a different group?
>> Thanks,
>> Gil Grodsky
>> ggrodsky@charter.net
>
>
> Try this script, it works for me:
>
> $my_var = 'Hello world!';
>
> function my_trace($m){ // pay attention to the use
> of single vs double quotes throughout
> $q = substr($m, 1); // chop off the leading '$' in
> the variable name
> @eval("global \${$q};"); // need to use global to get
> value of local variables into this function
> // also need @ to supress warning
> caused by brackets in superglobal variables
> eval("\$t = \${$q};"); // assign value of orginal $m to
> $t
> echo ("<br />TRACE: $m = $t<br />"); // output
> my_trace('$my_var'); // note the use of single
> quotes here
> my_trace('$_ENV["COMPUTERNAME"]'); // note where the single
> quotes are used here
>
> Hope it helps,
> Bob
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>
Dunno if anyone's mentioned it yet, but have you had a look at
debug_backtrace()?
http://www.php.net/manual/en/function.debug-backtrace.php
I use it a lot during development and you skip the eval() call. You
should be able to write a simple function to pull the info out that you
want, but I usually just do a print_r() on it and manually look through
the output.
Edward Vermillion
evermillion@doggydoo.net
Navigation:
[Reply to this message]
|