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@xxxxxxxxxxx
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@xxxxxxxxxxxx
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
