[PHP] Re: How to print variable name and contents
Bob and Ed and others, Thanks for all the responses. They really helped. -- Gil -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: How to print variable name and contents
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 (\nbrTRACE: $m = );
eval(\$t=\$m\;);
echo($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
[EMAIL PROTECTED]
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 = $tbr /); // output
my_trace('$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
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[PHP] Re: How to print variable name and contents
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 (\nbrTRACE: $m = );
eval(\$t=\$m\;);
echo($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
[EMAIL PROTECTED]
Sorry, I was missing a closing '}' in my previous post -- it should have been:
$my_var = 'Hello world!';
function my_trace($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 = $tbr /); // output
}
my_trace('$my_var'); // note the use of single quotes here
my_trace('$_ENV[COMPUTERNAME]'); // note where the single quotes are
used here
/
Bob
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Re: [PHP] Re: How to print variable name and contents
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 (\nbrTRACE: $m = );
eval(\$t=\$m\;);
echo($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
[EMAIL PROTECTED]
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 = $tbr /); // output
my_trace('$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
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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
[EMAIL PROTECTED]
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[PHP] Re: How to print variable name and contents
You can use $$var constuction, what display name of $var
function my_trace($var){
echo $$var.'='.$var.'br';
}
nntp.charter.net [EMAIL PROTECTED] /
: news:[EMAIL PROTECTED]
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 (\nbrTRACE: $m = );
eval(\$t=\$m\;);
echo($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
[EMAIL PROTECTED]
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
